From 0e9b01539edf6c5aabbf3eefd8c719f136f3772a Mon Sep 17 00:00:00 2001
From: Tim Cappalli <tim@cloudauth.dev>
Date: Wed, 24 Jul 2024 19:00:09 +0000
Subject: [PATCH] Merge pull request #2040 from w3c/tc-related-origins

SHA: 2b8e3688f0adec29b6f845c10f4e19402e6ea66a
Reason: push, by nsatragno

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 index.html | 1253 +++++++++++++++++++++++++++++-----------------------
 1 file changed, 703 insertions(+), 550 deletions(-)

diff --git a/index.html b/index.html
index f778e7c04..ace7df2f4 100644
--- a/index.html
+++ b/index.html
@@ -6,7 +6,7 @@
   <meta content="ED" name="w3c-status">
   <meta content="Bikeshed version a1dabb26c, updated Mon Jun 17 15:00:44 2024 -0700" name="generator">
   <link href="https://www.w3.org/TR/webauthn-3/" rel="canonical">
-  <meta content="061a649f3ae7634e1448129ea72951fa7e387fdd" name="revision">
+  <meta content="2b8e3688f0adec29b6f845c10f4e19402e6ea66a" name="revision">
   <meta content="dark light" name="color-scheme">
 <style type="text/css">
 body {
@@ -965,7 +965,7 @@
   <div class="head">
    <p data-fill-with="logo"><a class="logo" href="https://www.w3.org/"> <img alt="W3C" height="48" src="https://www.w3.org/StyleSheets/TR/2021/logos/W3C" width="72"> </a> </p>
    <h1>Web Authentication:<br>An API for accessing Public Key Credentials<br>Level 3</h1>
-   <p id="w3c-state"><a href="https://www.w3.org/standards/types#ED">Editor’s Draft</a>, <time class="dt-updated" datetime="2024-07-08">8 July 2024</time></p>
+   <p id="w3c-state"><a href="https://www.w3.org/standards/types#ED">Editor’s Draft</a>, <time class="dt-updated" datetime="2024-07-24">24 July 2024</time></p>
    <details open>
     <summary>More details about this document</summary>
     <div data-fill-with="spec-metadata">
@@ -1168,6 +1168,11 @@ <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
        </ol>
       <li><a href="#sctn-permissions-policy"><span class="secno">5.9</span> <span class="content">Permissions Policy integration</span></a>
       <li><a href="#sctn-iframe-guidance"><span class="secno">5.10</span> <span class="content">Using Web Authentication within <code>iframe</code> elements</span></a>
+      <li>
+       <a href="#sctn-related-origins"><span class="secno">5.11</span> <span class="content">Using Web Authentication across related origins</span></a>
+       <ol class="toc">
+        <li><a href="#sctn-validating-relation-origin"><span class="secno">5.11.1</span> <span class="content">Validating Related Origins</span></a>
+       </ol>
      </ol>
     <li>
      <a href="#sctn-authenticator-model"><span class="secno">6</span> <span class="content">WebAuthn <span>Authenticator Model</span></span></a>
@@ -2243,6 +2248,11 @@ <h2 class="heading settled" data-level="4" id="sctn-terminology"><span class="se
     <dt data-md><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="non-discoverable-credential">Non-Discoverable Credential</dfn>
     <dd data-md>
      <p>This is a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential③">credential</a> whose <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id①①">credential ID</a> must be provided in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②">allowCredentials</a></code> when calling <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get④">navigator.credentials.get()</a></code> because it is not <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential④">client-side discoverable</a>. See also <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential②">server-side credentials</a>.</p>
+    <dt data-md><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="registrable-origin-label">Registrable Origin Label</dfn>
+    <dd data-md>
+     <p>The first <a data-link-type="dfn" href="https://url.spec.whatwg.org/#domain-label" id="ref-for-domain-label">domain label</a> of the <a data-link-type="dfn" href="https://url.spec.whatwg.org/#host-registrable-domain" id="ref-for-host-registrable-domain">registrable domain</a> of a <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-domain" id="ref-for-concept-domain①">domain</a>,
+or null if the <a data-link-type="dfn" href="https://url.spec.whatwg.org/#host-registrable-domain" id="ref-for-host-registrable-domain①">registrable domain</a> is null.
+For example, the <a data-link-type="dfn" href="#registrable-origin-label" id="ref-for-registrable-origin-label">registrable origin label</a> of both <code>example.co.uk</code> and <code>www.example.de</code> is <code>example</code> if both <code>co.uk</code> and <code>de</code> are <a data-link-type="dfn" href="https://url.spec.whatwg.org/#host-public-suffix" id="ref-for-host-public-suffix">public suffixes</a>.</p>
     <dt data-md><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="public-key-credential">Public Key Credential</dfn>
     <dd data-md>
      <p>Generically, a <em>credential</em> is data one entity presents to another in order to <em>authenticate</em> the former to the latter <a data-link-type="biblio" href="#biblio-rfc4949" title="Internet Security Glossary, Version 2">[RFC4949]</a>. The term <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential①③">public key credential</a> refers to one of: a <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source②⑦">public key credential source</a>, the
@@ -2336,7 +2346,7 @@ <h2 class="heading settled" data-level="4" id="sctn-terminology"><span class="se
 overridden by the caller, as long as the caller-specified <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤">RP ID</a> value <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#is-a-registrable-domain-suffix-of-or-is-equal-to" id="ref-for-is-a-registrable-domain-suffix-of-or-is-equal-to">is a registrable domain suffix of or is equal
 to</a> the caller’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-settings-object-origin" id="ref-for-concept-settings-object-origin①">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain①">effective domain</a>. See also <a href="#sctn-createCredential">§ 5.1.3 Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a> and <a href="#sctn-getAssertion">§ 5.1.4 Use an Existing Credential to Make an Assertion - PublicKeyCredential’s [[Get]](options) Method</a>.</p>
      <div class="note" id="note-pkcredscope" role="note">
-      <a class="self-link" href="#note-pkcredscope"></a> Note: An <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑥">RP ID</a> is based on a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-host" id="ref-for-concept-origin-host">host</a>'s <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-domain" id="ref-for-concept-domain①">domain</a> name. It does not itself include a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-scheme" id="ref-for-concept-origin-scheme">scheme</a> or <a data-link-type="dfn" href="https://url.spec.whatwg.org#concept-url-port" id="ref-for-concept-url-port①">port</a>, as an <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin②">origin</a> does. The <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑦">RP ID</a> of a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential①⑦">public key credential</a> determines its <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="scope">scope</dfn>. I.e., it <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised">determines the set of origins on which the public key credential may be exercised</dfn>, as follows: 
+      <a class="self-link" href="#note-pkcredscope"></a> Note: An <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑥">RP ID</a> is based on a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-host" id="ref-for-concept-origin-host">host</a>'s <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-domain" id="ref-for-concept-domain②">domain</a> name. It does not itself include a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-scheme" id="ref-for-concept-origin-scheme">scheme</a> or <a data-link-type="dfn" href="https://url.spec.whatwg.org#concept-url-port" id="ref-for-concept-url-port①">port</a>, as an <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin②">origin</a> does. The <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑦">RP ID</a> of a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential①⑦">public key credential</a> determines its <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="scope">scope</dfn>. I.e., it <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised">determines the set of origins on which the public key credential may be exercised</dfn>, as follows: 
       <ul>
        <li data-md>
         <p>The <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑧">RP ID</a> must be equal to the <a data-link-type="dfn" href="#determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised" id="ref-for-determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain②">effective domain</a>, or a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#is-a-registrable-domain-suffix-of-or-is-equal-to" id="ref-for-is-a-registrable-domain-suffix-of-or-is-equal-to①">registrable domain suffix</a> of the <a data-link-type="dfn" href="#determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised" id="ref-for-determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised①">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain③">effective domain</a>.</p>
@@ -2521,7 +2531,12 @@ <h3 class="heading settled" data-level="5.1" id="iface-pkcredential"><span class
 attempting to set <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-mediation" id="ref-for-dom-credentialrequestoptions-mediation">mediation</a></code></code> to <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①">conditional</a></code>.</p>
      <p>Upon invocation, a promise is returned that resolves with a value of <code>true</code> if <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional②">conditional</a></code> <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#user-mediated" id="ref-for-user-mediated">user mediation</a> is available, or <code>false</code> otherwise.</p>
      <p>This method has no arguments and returns a promise to a Boolean value.</p>
+     <p>The <code class="idl"><a data-link-type="idl" href="#dom-clientcapability-conditionalget" id="ref-for-dom-clientcapability-conditionalget">conditionalGet</a></code> capability is equivalent to this promise resolving to <code>true</code>.</p>
      <p class="note" role="note"><span class="marker">Note:</span> If this method is not present, <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional③">conditional</a></code> <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#user-mediated" id="ref-for-user-mediated①">user mediation</a> is not available for <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get①②">navigator.credentials.get()</a></code>.</p>
+     <p class="note" role="note"><span class="marker">Note:</span> This method does _not_ indicate
+whether or not <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional④">conditional</a></code> <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#user-mediated" id="ref-for-user-mediated②">user mediation</a> is available
+in <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create⑤">navigator.credentials.create()</a></code>.
+For that, see the <code class="idl"><a data-link-type="idl" href="#dom-clientcapability-conditionalcreate" id="ref-for-dom-clientcapability-conditionalcreate">conditionalCreate</a></code> capability in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientcapabilities" id="ref-for-dom-publickeycredential-getclientcapabilities">getClientCapabilities()</a></code>.</p>
     <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-tojson" id="ref-for-dom-publickeycredential-tojson">toJSON()</a></code>
     <dd data-md>
      <p>This operation returns <code class="idl"><a data-link-type="idl" href="#dictdef-registrationresponsejson" id="ref-for-dictdef-registrationresponsejson">RegistrationResponseJSON</a></code> or <code class="idl"><a data-link-type="idl" href="#dictdef-authenticationresponsejson" id="ref-for-dictdef-authenticationresponsejson">AuthenticationResponseJSON</a></code>,
@@ -2561,7 +2576,7 @@ <h3 class="heading settled" data-level="5.1" id="iface-pkcredential"><span class
     // algorithm then the public key must be parsed directly from
     // attestationObject or authenticatorData.
     <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring④"><c- n>Base64URLString</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponseJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString" id="dom-authenticatorattestationresponsejson-publickey"><code><c- g>publicKey</c-></code></dfn>;
-    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-long-long" id="ref-for-idl-long-long"><c- b>long</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponseJSON" data-dfn-type="dict-member" data-export data-type="long long" id="dom-authenticatorattestationresponsejson-publickeyalgorithm"><code><c- g>publicKeyAlgorithm</c-></code></dfn>;
+    <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier"><c- n>COSEAlgorithmIdentifier</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponseJSON" data-dfn-type="dict-member" data-export data-type="COSEAlgorithmIdentifier" id="dom-authenticatorattestationresponsejson-publickeyalgorithm"><code><c- g>publicKeyAlgorithm</c-></code></dfn>;
     // This value contains copies of some of the fields above. See
     // section “Easily accessing credential data”.
     <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring⑤"><c- n>Base64URLString</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponseJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString" id="dom-authenticatorattestationresponsejson-attestationobject"><code><c- g>attestationObject</c-></code></dfn>;
@@ -2606,14 +2621,14 @@ <h3 class="heading settled" data-level="5.1" id="iface-pkcredential"><span class
 For example, an authenticator without on-board storage may create identifiers containing a <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key⑦">credential private key</a> wrapped with a symmetric key that is burned into the authenticator.</p>
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="attribute" data-export id="dom-publickeycredential-clientextensionsresults-slot"><code>[[clientExtensionsResults]]</code></dfn>
     <dd data-md>
-     <p>This <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots⑤">internal slot</a> contains the results of processing client extensions requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨④">Relying Party</a> upon the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑤">Relying Party</a>'s invocation of either <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create⑤">navigator.credentials.create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get①③">navigator.credentials.get()</a></code>.</p>
+     <p>This <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots⑤">internal slot</a> contains the results of processing client extensions requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨④">Relying Party</a> upon the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑤">Relying Party</a>'s invocation of either <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create⑥">navigator.credentials.create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get①③">navigator.credentials.get()</a></code>.</p>
    </dl>
    <p><code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①⓪">PublicKeyCredential</a></code>'s <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-interface-object" id="ref-for-dfn-interface-object②">interface object</a> inherits <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#credential" id="ref-for-credential⑥">Credential</a></code>'s implementation of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credential-collectfromcredentialstore-slot" id="ref-for-dom-credential-collectfromcredentialstore-slot">[[CollectFromCredentialStore]](origin, options, sameOriginWithAncestors)</a></code>, and defines its own
 implementation of each of <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-create-slot" id="ref-for-dom-publickeycredential-create-slot①">[[Create]](origin, options, sameOriginWithAncestors)</a></code>, <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-slot" id="ref-for-dom-publickeycredential-discoverfromexternalsource-slot①">[[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors)</a></code>, and <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-store-slot" id="ref-for-dom-publickeycredential-store-slot">[[Store]](credential, sameOriginWithAncestors)</a></code>.</p>
    <p>Calling <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#credentialscontainer" id="ref-for-credentialscontainer">CredentialsContainer</a></code>'s <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-preventsilentaccess" id="ref-for-dom-credentialscontainer-preventsilentaccess">preventSilentAccess()</a></code> method
 will have no effect on <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①①">PublicKeyCredential</a></code> credentials, since they always require user interaction.</p>
    <h4 class="heading settled" data-level="5.1.1" id="sctn-credentialcreationoptions-extension"><span class="secno">5.1.1. </span><span class="content"><code>CredentialCreationOptions</code> Dictionary Extension</span><a class="self-link" href="#sctn-credentialcreationoptions-extension"></a></h4>
-   <p>To support registration via <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create⑥">navigator.credentials.create()</a></code>, this document extends
+   <p>To support registration via <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create⑦">navigator.credentials.create()</a></code>, this document extends
 the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dictdef-credentialcreationoptions" id="ref-for-dictdef-credentialcreationoptions">CredentialCreationOptions</a></code> dictionary as follows:</p>
 <pre class="idl highlight def"><c- b>partial</c-> <c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="https://w3c.github.io/webappsec-credential-management/#dictdef-credentialcreationoptions" id="ref-for-dictdef-credentialcreationoptions①"><c- g>CredentialCreationOptions</c-></a> {
     <a data-link-type="idl-name" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions"><c- n>PublicKeyCredentialCreationOptions</c-></a>      <dfn class="dfn-paneled idl-code" data-dfn-for="CredentialCreationOptions" data-dfn-type="dict-member" data-export data-type="PublicKeyCredentialCreationOptions" id="dom-credentialcreationoptions-publickey"><code><c- g>publicKey</c-></code></dfn>;
@@ -2628,10 +2643,10 @@ <h4 class="heading settled" data-level="5.1.2" id="sctn-credentialrequestoptions
    <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span class="secno">5.1.3. </span><span class="content">Create a New Credential - PublicKeyCredential’s <code>[[Create]](origin, options, sameOriginWithAncestors)</code> Method</span><a class="self-link" href="#sctn-createCredential"></a></h4>
    <div data-link-for-hint="PublicKeyCredential/[[Create]](origin, options, sameOriginWithAncestors)">
      <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①②">PublicKeyCredential</a></code>'s <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-interface-object" id="ref-for-dfn-interface-object③">interface object</a>'s implementation of the <dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="method" data-export data-lt="[[Create]](origin, options, sameOriginWithAncestors)" id="dom-publickeycredential-create-slot"><code>[[Create]](origin,
-options, sameOriginWithAncestors)</code></dfn> <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots⑥">internal method</a> <a data-link-type="biblio" href="#biblio-credential-management-1" title="Credential Management Level 1">[CREDENTIAL-MANAGEMENT-1]</a> allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①①">WebAuthn Relying Party</a> scripts to call <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create⑦">navigator.credentials.create()</a></code> to request the creation of a new <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source④⓪">public key credential source</a>, <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential⑦">bound</a> to an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑥⑦">authenticator</a>. 
-    <p>By setting <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialcreationoptions-mediation" id="ref-for-dom-credentialcreationoptions-mediation">mediation</a></code></code> to <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional④">conditional</a></code>, <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑥">Relying Parties</a> can indicate that they would like to register a credential without prominent modal UI if user has already consented to create a credential. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑦">Relying Party</a> SHOULD first check that <code class="idl"><a data-link-type="idl" href="#dom-clientcapability-conditionalcreate" id="ref-for-dom-clientcapability-conditionalcreate">conditionalCreate</a></code> is present
-in the result of <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientcapabilities" id="ref-for-dom-publickeycredential-getclientcapabilities">getClientCapabilities()</a></code> in order to avoid the possibility of causing a user-visible error to be returned if the user agent does
-not support <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional⑤">conditional</a></code> <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#user-mediated" id="ref-for-user-mediated②">user mediation</a> for <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create⑧">navigator.credentials.create()</a></code>.
+options, sameOriginWithAncestors)</code></dfn> <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots⑥">internal method</a> <a data-link-type="biblio" href="#biblio-credential-management-1" title="Credential Management Level 1">[CREDENTIAL-MANAGEMENT-1]</a> allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①①">WebAuthn Relying Party</a> scripts to call <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create⑧">navigator.credentials.create()</a></code> to request the creation of a new <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source④⓪">public key credential source</a>, <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential⑦">bound</a> to an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑥⑦">authenticator</a>. 
+    <p>By setting <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialcreationoptions-mediation" id="ref-for-dom-credentialcreationoptions-mediation">mediation</a></code></code> to <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional⑤">conditional</a></code>, <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑥">Relying Parties</a> can indicate that they would like to register a credential without prominent modal UI if the user has already consented to create a credential.
+The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑦">Relying Party</a> SHOULD first use <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientcapabilities" id="ref-for-dom-publickeycredential-getclientcapabilities①">getClientCapabilities()</a></code> to check that the <a data-link-type="dfn" href="#client" id="ref-for-client①⑥">client</a> supports the <code class="idl"><a data-link-type="idl" href="#dom-clientcapability-conditionalcreate" id="ref-for-dom-clientcapability-conditionalcreate①">conditionalCreate</a></code> capability
+in order to prevent a user-visible error in case this feature is not available.
 The client MUST set BOTH <var>requireUserPresence</var> and <var>requireUserVerification</var> to <var>FALSE</var> when <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialcreationoptions-mediation" id="ref-for-dom-credentialcreationoptions-mediation①">mediation</a></code></code> is set to <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional⑥">conditional</a></code> unless they may explicitly performed during the ceremony.</p>
     <p>Any <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create⑨">navigator.credentials.create()</a></code> operation can be aborted by leveraging the <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortcontroller" id="ref-for-abortcontroller">AbortController</a></code>;
 see <a href="https://dom.spec.whatwg.org/#abortcontroller-api-integration"><cite>DOM</cite> § 3.3 Using AbortController and AbortSignal objects in APIs</a> for detailed instructions.</p>
@@ -2676,14 +2691,14 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
        <li data-md>
         <p><a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/interaction.html#consume-user-activation" id="ref-for-consume-user-activation">Consume user activation</a> of the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-relevant-global" id="ref-for-concept-relevant-global①">relevant global object</a>.</p>
       </ol>
-      <p class="note" role="note"><span class="marker">NOTE:</span> The <a data-link-type="dfn" href="#client" id="ref-for-client①⑥">client</a> SHOULD make it clear to the user in the case where the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①⓪">origin</a> that is creating a credential is different from the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-environment-top-level-origin" id="ref-for-concept-environment-top-level-origin">top-level origin</a> of the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-relevant-global" id="ref-for-concept-relevant-global②">relevant global object</a> (i.e., is a
+      <p class="note" role="note"><span class="marker">NOTE:</span> The <a data-link-type="dfn" href="#client" id="ref-for-client①⑦">client</a> SHOULD make it clear to the user in the case where the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①⓪">origin</a> that is creating a credential is different from the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-environment-top-level-origin" id="ref-for-concept-environment-top-level-origin">top-level origin</a> of the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-relevant-global" id="ref-for-concept-relevant-global②">relevant global object</a> (i.e., is a
       different origin than the user can see in the address bar).</p>
      <li data-md>
       <p>Let <var>pkOptions</var> be the value of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-credentialcreationoptions-publickey" id="ref-for-dom-credentialcreationoptions-publickey③">publicKey</a></code></code>.</p>
      <li data-md>
       <p>If <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout">timeout</a></code></code> is present, check if its value lies within a
-reasonable range as defined by the <a data-link-type="dfn" href="#client" id="ref-for-client①⑦">client</a> and if not, correct it to the closest value lying within that range. Set a timer <var>lifetimeTimer</var> to this adjusted value. If <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout①">timeout</a></code></code> is not
-present, then set <var>lifetimeTimer</var> to a <a data-link-type="dfn" href="#client" id="ref-for-client①⑧">client</a>-specific default.</p>
+reasonable range as defined by the <a data-link-type="dfn" href="#client" id="ref-for-client①⑧">client</a> and if not, correct it to the closest value lying within that range. Set a timer <var>lifetimeTimer</var> to this adjusted value. If <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout①">timeout</a></code></code> is not
+present, then set <var>lifetimeTimer</var> to a <a data-link-type="dfn" href="#client" id="ref-for-client①⑨">client</a>-specific default.</p>
       <p>See the <a data-link-type="dfn" href="#recommended-range-and-default-for-a-webauthn-ceremony-timeout" id="ref-for-recommended-range-and-default-for-a-webauthn-ceremony-timeout">recommended range and default for a WebAuthn ceremony timeout</a> for guidance on deciding a reasonable range and default for <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout②">timeout</a></code></code>.</p>
       <p class="note" role="note"><span class="marker">Note:</span> The user agent should take cognitive guidelines into considerations regarding timeout for users with special needs.</p>
      <li data-md>
@@ -2695,8 +2710,8 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
 If <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain⑤">effective domain</a> is not a <a data-link-type="dfn" href="https://url.spec.whatwg.org/#valid-domain" id="ref-for-valid-domain①">valid domain</a>, then throw a
 "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException④">DOMException</a></code>.</p>
       <p class="note" role="note"><span class="marker">Note:</span> An <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain⑥">effective domain</a> may resolve to a <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-url-host" id="ref-for-concept-url-host①">host</a>, which can be represented in various manners,
-    such as <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-domain" id="ref-for-concept-domain②">domain</a>, <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-ipv4" id="ref-for-concept-ipv4">ipv4 address</a>, <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-ipv6" id="ref-for-concept-ipv6">ipv6 address</a>, <a data-link-type="dfn" href="https://url.spec.whatwg.org/#opaque-host" id="ref-for-opaque-host">opaque host</a>, or <a data-link-type="dfn" href="https://url.spec.whatwg.org/#empty-host" id="ref-for-empty-host">empty host</a>.
-    Only the <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-domain" id="ref-for-concept-domain③">domain</a> format of <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-url-host" id="ref-for-concept-url-host②">host</a> is allowed here. This is for simplification and also
+    such as <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-domain" id="ref-for-concept-domain③">domain</a>, <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-ipv4" id="ref-for-concept-ipv4">ipv4 address</a>, <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-ipv6" id="ref-for-concept-ipv6">ipv6 address</a>, <a data-link-type="dfn" href="https://url.spec.whatwg.org/#opaque-host" id="ref-for-opaque-host">opaque host</a>, or <a data-link-type="dfn" href="https://url.spec.whatwg.org/#empty-host" id="ref-for-empty-host">empty host</a>.
+    Only the <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-domain" id="ref-for-concept-domain④">domain</a> format of <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-url-host" id="ref-for-concept-url-host②">host</a> is allowed here. This is for simplification and also
     is in recognition of various issues with using direct IP address identification in concert
     with PKI-based security.</p>
      <li id="CreateCred-DetermineRpId">
@@ -2706,22 +2721,36 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
        <dt data-md>is present
        <dd data-md>
         <p>If <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp②">rp</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id②">id</a></code></code> <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#is-a-registrable-domain-suffix-of-or-is-equal-to" id="ref-for-is-a-registrable-domain-suffix-of-or-is-equal-to②">is not a
-registrable domain suffix of and is not equal to</a> <var>effectiveDomain</var>, throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror①">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException⑤">DOMException</a></code>.</p>
-       <dt data-md>Is not present
+registrable domain suffix of and is not equal to</a> <var>effectiveDomain</var>, and if the client</p>
+        <dl class="switch">
+         <dt data-md>supports <a href="#sctn-related-origins">related origin requests</a>
+         <dd data-md>
+          <ol>
+           <li data-md>
+            <p>Let <var>rpIdRequested</var> be the value of <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp③">rp</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id③">id</a></code></code>.</p>
+           <li data-md>
+            <p>Run the <a data-link-type="abstract-op" href="#abstract-opdef-related-origins-validation-procedure" id="ref-for-abstract-opdef-related-origins-validation-procedure">related origins validation procedure</a> with arguments <var>callerOrigin</var> and <var>rpIdRequested</var>.
+If the result is <code>false</code>, throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror①">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException⑤">DOMException</a></code>.</p>
+          </ol>
+         <dt data-md>does not support <a href="#sctn-related-origins">related origin requests</a>
+         <dd data-md>
+          <p>throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror②">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException⑥">DOMException</a></code>.</p>
+        </dl>
+       <dt data-md>is not present
        <dd data-md>
-        <p>Set <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp③">rp</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id③">id</a></code></code> to <var>effectiveDomain</var>.</p>
+        <p>Set <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp④">rp</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id④">id</a></code></code> to <var>effectiveDomain</var>.</p>
       </dl>
-      <p class="note" role="note"><span class="marker">Note:</span> <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp④">rp</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id④">id</a></code></code> represents the
-        caller’s <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id①⑦">RP ID</a>. The <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id①⑧">RP ID</a> defaults to being the caller’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-settings-object-origin" id="ref-for-concept-settings-object-origin③">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain⑦">effective domain</a> unless the caller has explicitly set <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp⑤">rp</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id⑤">id</a></code></code> when calling <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①③">create()</a></code>.</p>
+      <p class="note" role="note"><span class="marker">Note:</span> <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp⑤">rp</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id⑤">id</a></code></code> represents the
+        caller’s <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id①⑦">RP ID</a>. The <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id①⑧">RP ID</a> defaults to being the caller’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-settings-object-origin" id="ref-for-concept-settings-object-origin③">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain⑦">effective domain</a> unless the caller has explicitly set <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp⑥">rp</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id⑥">id</a></code></code> when calling <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①③">create()</a></code>.</p>
      <li data-md>
       <p>Let <var>credTypesAndPubKeyAlgs</var> be a new <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list">list</a> whose <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item①">items</a> are pairs of <code class="idl"><a data-link-type="idl" href="#enumdef-publickeycredentialtype" id="ref-for-enumdef-publickeycredentialtype①">PublicKeyCredentialType</a></code> and
-a <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier">COSEAlgorithmIdentifier</a></code>.</p>
+a <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier①">COSEAlgorithmIdentifier</a></code>.</p>
      <li data-md>
       <p>If <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-pubkeycredparams" id="ref-for-dom-publickeycredentialcreationoptions-pubkeycredparams">pubKeyCredParams</a></code></code>’s <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size">size</a></p>
       <dl class="switch">
        <dt data-md>is zero
        <dd data-md>
-        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-append" id="ref-for-list-append">Append</a> the following pairs of <code class="idl"><a data-link-type="idl" href="#enumdef-publickeycredentialtype" id="ref-for-enumdef-publickeycredentialtype②">PublicKeyCredentialType</a></code> and <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier①">COSEAlgorithmIdentifier</a></code> values to <var>credTypesAndPubKeyAlgs</var>:</p>
+        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-append" id="ref-for-list-append">Append</a> the following pairs of <code class="idl"><a data-link-type="idl" href="#enumdef-publickeycredentialtype" id="ref-for-enumdef-publickeycredentialtype②">PublicKeyCredentialType</a></code> and <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier②">COSEAlgorithmIdentifier</a></code> values to <var>credTypesAndPubKeyAlgs</var>:</p>
         <ul>
          <li data-md>
           <p><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialtype-public-key" id="ref-for-dom-publickeycredentialtype-public-key①">public-key</a></code> and <code>-7</code> ("ES256").</p>
@@ -2740,7 +2769,7 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
          <li data-md>
           <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-append" id="ref-for-list-append①">Append</a> the pair of <code><var>current</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialparameters-type" id="ref-for-dom-publickeycredentialparameters-type①">type</a></code></code> and <var>alg</var> to <var>credTypesAndPubKeyAlgs</var>.</p>
         </ol>
-        <p>If <var>credTypesAndPubKeyAlgs</var> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-is-empty" id="ref-for-list-is-empty②">is empty</a>, throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror">NotSupportedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException⑥">DOMException</a></code>.</p>
+        <p>If <var>credTypesAndPubKeyAlgs</var> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-is-empty" id="ref-for-list-is-empty②">is empty</a>, throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror">NotSupportedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException⑦">DOMException</a></code>.</p>
       </dl>
      <li data-md>
       <p>Let <var>clientExtensions</var> be a new <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map①">map</a> and let <var>authenticatorExtensions</var> be a new <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map②">map</a>.</p>
@@ -2790,13 +2819,13 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
      <li data-md>
       <p>Let <var>authenticators</var> represent a value which at any given instant is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set①">set</a> of <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform①⑦">client platform</a>-specific handles, where each <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item②">item</a> identifies an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑥⑧">authenticator</a> presently available on this <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform①⑧">client platform</a> at that instant.</p>
       <p class="note" role="note"><span class="marker">Note:</span> What qualifies an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑥⑨">authenticator</a> as "available" is intentionally unspecified; this is meant to represent how <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑦⓪">authenticators</a> can be <a href="https://en.wikipedia.org/w/index.php?title=Hot_plug">hot-plugged</a> into (e.g., via USB)
-or discovered (e.g., via NFC or Bluetooth) by the <a data-link-type="dfn" href="#client" id="ref-for-client①⑨">client</a> by various mechanisms, or permanently built into the <a data-link-type="dfn" href="#client" id="ref-for-client②⓪">client</a>.</p>
+or discovered (e.g., via NFC or Bluetooth) by the <a data-link-type="dfn" href="#client" id="ref-for-client②⓪">client</a> by various mechanisms, or permanently built into the <a data-link-type="dfn" href="#client" id="ref-for-client②①">client</a>.</p>
      <li data-md>
       <p>If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialcreationoptions-mediation" id="ref-for-dom-credentialcreationoptions-mediation③">mediation</a></code></code> is present with the value <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional⑧">conditional</a></code>:</p>
       <ol>
        <li data-md>
         <p>If the user agent has not recently mediated an authentication, the origin of said authentication is not <var>callerOrigin</var>, or the user
-does not consent to this type of credential creation, throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror③">NotAllowedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException⑦">DOMException</a></code>.</p>
+does not consent to this type of credential creation, throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror③">NotAllowedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException⑧">DOMException</a></code>.</p>
         <p>It is up to the user agent to decide when it believes an authentication ceremony has
 been completed. That authentication ceremony MAY be performed via other means than the <a data-link-type="dfn" href="#web-authentication-api" id="ref-for-web-authentication-api①①">Web Authentication API</a>.</p>
       </ol>
@@ -2813,7 +2842,7 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
         <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate②">For each</a> <var>authenticator</var> in <var>issuedRequests</var> invoke the <a data-link-type="dfn" href="#authenticatorcancel" id="ref-for-authenticatorcancel">authenticatorCancel</a> operation on <var>authenticator</var> and <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-remove" id="ref-for-list-remove">remove</a> <var>authenticator</var> from <var>issuedRequests</var>.</p>
        <dt data-md>If the user exercises a user agent user-interface option to cancel the process,
        <dd data-md>
-        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate③">For each</a> <var>authenticator</var> in <var>issuedRequests</var> invoke the <a data-link-type="dfn" href="#authenticatorcancel" id="ref-for-authenticatorcancel①">authenticatorCancel</a> operation on <var>authenticator</var> and <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-remove" id="ref-for-list-remove①">remove</a> <var>authenticator</var> from <var>issuedRequests</var>. Throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror④">NotAllowedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException⑧">DOMException</a></code>.</p>
+        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate③">For each</a> <var>authenticator</var> in <var>issuedRequests</var> invoke the <a data-link-type="dfn" href="#authenticatorcancel" id="ref-for-authenticatorcancel①">authenticatorCancel</a> operation on <var>authenticator</var> and <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-remove" id="ref-for-list-remove①">remove</a> <var>authenticator</var> from <var>issuedRequests</var>. Throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror④">NotAllowedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException⑨">DOMException</a></code>.</p>
        <dt data-md>If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialcreationoptions-signal" id="ref-for-dom-credentialcreationoptions-signal②">signal</a></code></code> is present and <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-aborted" id="ref-for-abortsignal-aborted①">aborted</a>,
        <dd data-md>
         <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate④">For each</a> <var>authenticator</var> in <var>issuedRequests</var> invoke the <a data-link-type="dfn" href="#authenticatorcancel" id="ref-for-authenticatorcancel②">authenticatorCancel</a> operation on <var>authenticator</var> and <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-remove" id="ref-for-list-remove②">remove</a> <var>authenticator</var> from <var>issuedRequests</var>. Then throw the <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialcreationoptions-signal" id="ref-for-dom-credentialcreationoptions-signal③">signal</a></code></code>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-abort-reason" id="ref-for-abortsignal-abort-reason①">abort reason</a>.</p>
@@ -2863,7 +2892,7 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
              <dt data-md>is capable of <a data-link-type="dfn" href="#client-side-credential-storage-modality" id="ref-for-client-side-credential-storage-modality①">client-side credential storage modality</a>
              <dd data-md>
               <p>Let <var>requireResidentKey</var> be <code>true</code>.</p>
-             <dt data-md>is not capable of <a data-link-type="dfn" href="#client-side-credential-storage-modality" id="ref-for-client-side-credential-storage-modality②">client-side credential storage modality</a>, or if the <a data-link-type="dfn" href="#client" id="ref-for-client②①">client</a> cannot determine authenticator capability,
+             <dt data-md>is not capable of <a data-link-type="dfn" href="#client-side-credential-storage-modality" id="ref-for-client-side-credential-storage-modality②">client-side credential storage modality</a>, or if the <a data-link-type="dfn" href="#client" id="ref-for-client②②">client</a> cannot determine authenticator capability,
              <dd data-md>
               <p>Let <var>requireResidentKey</var> be <code>false</code>.</p>
             </dl>
@@ -2883,7 +2912,7 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
             <ol>
              <li data-md>
               <p>If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialcreationoptions-mediation" id="ref-for-dom-credentialcreationoptions-mediation④">mediation</a></code></code> is set to <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional⑨">conditional</a></code> and <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification①⑥">user verification</a> cannot be collected during the ceremony,
-throw a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#constrainterror" id="ref-for-constrainterror">ConstraintError</a></code> <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException⑨">DOMException</a></code>.</p>
+throw a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#constrainterror" id="ref-for-constrainterror">ConstraintError</a></code> <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⓪">DOMException</a></code>.</p>
              <li data-md>
               <p>Let <var>userVerification</var> be <code>true</code>.</p>
             </ol>
@@ -2907,7 +2936,7 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
           <dl class="switch">
            <dt data-md>is set to <code class="idl"><a data-link-type="idl" href="#dom-attestationconveyancepreference-enterprise" id="ref-for-dom-attestationconveyancepreference-enterprise">enterprise</a></code>
            <dd data-md>
-            <p>Let <var>enterpriseAttestationPossible</var> be <code>true</code> if the user agent wishes to support enterprise attestation for <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp⑥">rp</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id⑥">id</a></code></code> (see <a href="#CreateCred-DetermineRpId">step 8</a>, above). Otherwise <code>false</code>.</p>
+            <p>Let <var>enterpriseAttestationPossible</var> be <code>true</code> if the user agent wishes to support enterprise attestation for <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp⑦">rp</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id⑦">id</a></code></code> (see <a href="#CreateCred-DetermineRpId">step 8</a>, above). Otherwise <code>false</code>.</p>
            <dt data-md>otherwise
            <dd data-md>
             <p>Let <var>enterpriseAttestationPossible</var> be <code>false</code>.</p>
@@ -2936,7 +2965,7 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
            <li data-md>
             <p>Otherwise, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-append" id="ref-for-list-append②">Append</a> <var>C</var> to <var>excludeCredentialDescriptorList</var>.</p>
           </ol>
-         <li id="CreateCred-InvokeAuthnrMakeCred"><a class="self-link" href="#CreateCred-InvokeAuthnrMakeCred"></a> Invoke the <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential⑤">authenticatorMakeCredential</a> operation on <var>authenticator</var> with <var>clientDataHash</var>, <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp⑦">rp</a></code></code>, <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user②">user</a></code></code>, <var>requireResidentKey</var>, <var>userVerification</var>, <var>credTypesAndPubKeyAlgs</var>, <var>excludeCredentialDescriptorList</var>, <var>enterpriseAttestationPossible</var>, <var>attestationFormats</var>,
+         <li id="CreateCred-InvokeAuthnrMakeCred"><a class="self-link" href="#CreateCred-InvokeAuthnrMakeCred"></a> Invoke the <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential⑤">authenticatorMakeCredential</a> operation on <var>authenticator</var> with <var>clientDataHash</var>, <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp⑧">rp</a></code></code>, <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user②">user</a></code></code>, <var>requireResidentKey</var>, <var>userVerification</var>, <var>credTypesAndPubKeyAlgs</var>, <var>excludeCredentialDescriptorList</var>, <var>enterpriseAttestationPossible</var>, <var>attestationFormats</var>,
         and <var>authenticatorExtensions</var> as parameters. 
          <li data-md>
           <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append">Append</a> <var>authenticator</var> to <var>issuedRequests</var>.</p>
@@ -2962,7 +2991,7 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
          <li data-md>
           <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate⑦">For each</a> remaining <var>authenticator</var> in <var>issuedRequests</var> invoke the <a data-link-type="dfn" href="#authenticatorcancel" id="ref-for-authenticatorcancel④">authenticatorCancel</a> operation on <var>authenticator</var> and <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-remove" id="ref-for-list-remove⑦">remove</a> it from <var>issuedRequests</var>.</p>
          <li data-md>
-          <p>Throw an "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#invalidstateerror" id="ref-for-invalidstateerror①">InvalidStateError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⓪">DOMException</a></code>.</p>
+          <p>Throw an "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#invalidstateerror" id="ref-for-invalidstateerror①">InvalidStateError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①①">DOMException</a></code>.</p>
         </ol>
         <p class="note" role="note"><span class="marker">Note:</span> This error status is handled separately because the <var>authenticator</var> returns it only if <var>excludeCredentialDescriptorList</var> identifies a credential <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential⑨">bound</a> to the <var>authenticator</var> and the user has <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent⑥">consented</a> to the operation. Given this explicit consent, it is acceptable for this case to be
 distinguishable to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑧">Relying Party</a>.</p>
@@ -3068,7 +3097,7 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
         </ol>
       </dl>
      <li data-md>
-      <p>Throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror⑤">NotAllowedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①①">DOMException</a></code>. In order to prevent information leak that could identify the
+      <p>Throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror⑤">NotAllowedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①②">DOMException</a></code>. In order to prevent information leak that could identify the
 user without <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent⑧">consent</a>, this step MUST NOT be executed before <var>lifetimeTimer</var> has expired. See <a href="#sctn-make-credential-privacy">§ 14.5.1 Registration Ceremony Privacy</a> for details.</p>
     </ol>
     <p>During the above process, the user agent SHOULD show some UI to the user to guide them in the process of selecting and
@@ -3085,9 +3114,10 @@ <h4 class="heading settled" data-level="5.1.4" id="sctn-getAssertion"><span clas
 the user select a <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source④⑤">public key credential source</a>.</p>
    <p>Since this specification requires an <a data-link-type="dfn" href="#authorization-gesture" id="ref-for-authorization-gesture①④">authorization gesture</a> to create any <a data-link-type="dfn" href="#assertion" id="ref-for-assertion②">assertions</a>, the <code>PublicKeyCredential.<dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="method" data-export id="dom-publickeycredential-collectfromcredentialstore-slot"><code>[[CollectFromCredentialStore]](origin, options, sameOriginWithAncestors)</code></dfn></code> <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots①①">internal method</a> inherits the default behavior of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credential-collectfromcredentialstore-slot" id="ref-for-dom-credential-collectfromcredentialstore-slot①">Credential.[[CollectFromCredentialStore]]()</a></code>, of returning an empty set.</p>
    <p>In general, the user agent SHOULD show some UI to the user to guide them in selecting and authorizing an authenticator with which
-to complete the operation. By setting <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-mediation" id="ref-for-dom-credentialrequestoptions-mediation①">mediation</a></code></code> to <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①①">conditional</a></code>, <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪④">Relying Parties</a> can indicate that a prominent modal UI should <i>not</i> be shown <i>unless</i> credentials are discovered. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⑤">Relying Party</a> script SHOULD first check that <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-isconditionalmediationavailable" id="ref-for-dom-publickeycredential-isconditionalmediationavailable①">isConditionalMediationAvailable()</a></code> returns <code>true</code> in order to avoid
-the possibility of causing a user-visible error to be returned if the user agent does not support <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①②">conditional</a></code> <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#user-mediated" id="ref-for-user-mediated④">user mediation</a>.</p>
-   <p>This <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get①⑦">navigator.credentials.get()</a></code> operation can be aborted by leveraging the <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortcontroller" id="ref-for-abortcontroller①">AbortController</a></code>;
+to complete the operation. By setting <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-mediation" id="ref-for-dom-credentialrequestoptions-mediation①">mediation</a></code></code> to <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①①">conditional</a></code>, <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪④">Relying Parties</a> can indicate that a prominent modal UI should <i>not</i> be shown <i>unless</i> credentials are discovered.
+The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⑤">Relying Party</a> SHOULD first use <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-isconditionalmediationavailable" id="ref-for-dom-publickeycredential-isconditionalmediationavailable①">isConditionalMediationAvailable()</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientcapabilities" id="ref-for-dom-publickeycredential-getclientcapabilities②">getClientCapabilities()</a></code> to check that the <a data-link-type="dfn" href="#client" id="ref-for-client②③">client</a> supports the <code class="idl"><a data-link-type="idl" href="#dom-clientcapability-conditionalget" id="ref-for-dom-clientcapability-conditionalget①">conditionalGet</a></code> capability
+in order to prevent a user-visible error in case this feature is not available.</p>
+   <p>Any <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get①⑦">navigator.credentials.get()</a></code> operation can be aborted by leveraging the <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortcontroller" id="ref-for-abortcontroller①">AbortController</a></code>;
 see <a href="https://dom.spec.whatwg.org/#abortcontroller-api-integration"><cite>DOM</cite> § 3.3 Using AbortController and AbortSignal objects in APIs</a> for detailed instructions.</p>
    <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external-source"><span class="secno">5.1.4.1. </span><span class="content">PublicKeyCredential’s <code><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="method" data-export id="dom-publickeycredential-discoverfromexternalsource-slot"><code>[[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors)</code></dfn></code> Method</span><a class="self-link" href="#sctn-discover-from-external-source"></a></h5>
    <div data-link-for-hint="PublicKeyCredential/[[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors)">
@@ -3117,13 +3147,13 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
      <li data-md>
       <p>Let <var>pkOptions</var> be the value of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-credentialrequestoptions-publickey" id="ref-for-dom-credentialrequestoptions-publickey③">publicKey</a></code></code>.</p>
      <li data-md>
-      <p>If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-mediation" id="ref-for-dom-credentialrequestoptions-mediation②">mediation</a></code></code> is present with the value <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①③">conditional</a></code>:</p>
+      <p>If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-mediation" id="ref-for-dom-credentialrequestoptions-mediation②">mediation</a></code></code> is present with the value <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①②">conditional</a></code>:</p>
       <ol>
        <li data-md>
         <p>Let <var>credentialIdFilter</var> be the value of <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials⑤">allowCredentials</a></code></code>.</p>
        <li data-md>
         <p>Set <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials⑥">allowCredentials</a></code></code> to <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty①">empty</a>.</p>
-        <p class="note" role="note"><span class="marker">Note:</span> This prevents <a data-link-type="dfn" href="#non-discoverable-credential" id="ref-for-non-discoverable-credential②">non-discoverable credentials</a> from being used during <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①④">conditional</a></code> requests.</p>
+        <p class="note" role="note"><span class="marker">Note:</span> This prevents <a data-link-type="dfn" href="#non-discoverable-credential" id="ref-for-non-discoverable-credential②">non-discoverable credentials</a> from being used during <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①③">conditional</a></code> requests.</p>
        <li data-md>
         <p>Set a timer <var>lifetimeTimer</var> to a value of infinity.</p>
         <p class="note" role="note"><span class="marker">Note:</span> <var>lifetimeTimer</var> is set to a value of infinity so that the user has the entire lifetime of
@@ -3136,34 +3166,49 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
         <p>Let <var>credentialIdFilter</var> be an <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty②">empty</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list②">list</a>.</p>
        <li data-md>
         <p>If <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout">timeout</a></code></code> is present, check if its value lies
-within a reasonable range as defined by the <a data-link-type="dfn" href="#client" id="ref-for-client②②">client</a> and if not, correct it to the closest value lying within that range.
-Set a timer <var>lifetimeTimer</var> to this adjusted value. If <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout①">timeout</a></code></code> is not present, then set <var>lifetimeTimer</var> to a <a data-link-type="dfn" href="#client" id="ref-for-client②③">client</a>-specific default.</p>
+within a reasonable range as defined by the <a data-link-type="dfn" href="#client" id="ref-for-client②④">client</a> and if not, correct it to the closest value lying within that range.
+Set a timer <var>lifetimeTimer</var> to this adjusted value. If <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout①">timeout</a></code></code> is not present, then set <var>lifetimeTimer</var> to a <a data-link-type="dfn" href="#client" id="ref-for-client②⑤">client</a>-specific default.</p>
         <p>See the <a data-link-type="dfn" href="#recommended-range-and-default-for-a-webauthn-ceremony-timeout" id="ref-for-recommended-range-and-default-for-a-webauthn-ceremony-timeout①">recommended range and default for a WebAuthn ceremony timeout</a> for guidance on deciding a reasonable range and default for <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout②">timeout</a></code></code>.</p>
         <p class="note" role="note"><span class="marker">Note:</span> The user agent should take cognitive guidelines into considerations regarding timeout for users with special needs.</p>
       </ol>
      <li data-md>
       <p>Let <var>callerOrigin</var> be <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-origin-options-sameoriginwithancestors-origin" id="ref-for-dom-publickeycredential-discoverfromexternalsource-origin-options-sameoriginwithancestors-origin">origin</a></code>. If <var>callerOrigin</var> is
-an <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin-opaque" id="ref-for-concept-origin-opaque①">opaque origin</a>, throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror⑥">NotAllowedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①②">DOMException</a></code>.</p>
+an <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin-opaque" id="ref-for-concept-origin-opaque①">opaque origin</a>, throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror⑥">NotAllowedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①③">DOMException</a></code>.</p>
      <li data-md>
       <p>Let <var>effectiveDomain</var> be the <var>callerOrigin</var>’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain⑧">effective domain</a>.
 If <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain⑨">effective domain</a> is not a <a data-link-type="dfn" href="https://url.spec.whatwg.org/#valid-domain" id="ref-for-valid-domain②">valid domain</a>, then throw a
-"<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror②">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①③">DOMException</a></code>.</p>
+"<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror③">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①④">DOMException</a></code>.</p>
       <p class="note" role="note"><span class="marker">Note:</span> An <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain①⓪">effective domain</a> may resolve to a <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-url-host" id="ref-for-concept-url-host③">host</a>, which can be represented in various manners,
-    such as <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-domain" id="ref-for-concept-domain④">domain</a>, <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-ipv4" id="ref-for-concept-ipv4①">ipv4 address</a>, <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-ipv6" id="ref-for-concept-ipv6①">ipv6 address</a>, <a data-link-type="dfn" href="https://url.spec.whatwg.org/#opaque-host" id="ref-for-opaque-host①">opaque host</a>, or <a data-link-type="dfn" href="https://url.spec.whatwg.org/#empty-host" id="ref-for-empty-host①">empty host</a>.
-    Only the <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-domain" id="ref-for-concept-domain⑤">domain</a> format of <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-url-host" id="ref-for-concept-url-host④">host</a> is allowed here. This is for simplification and also is
+    such as <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-domain" id="ref-for-concept-domain⑤">domain</a>, <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-ipv4" id="ref-for-concept-ipv4①">ipv4 address</a>, <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-ipv6" id="ref-for-concept-ipv6①">ipv6 address</a>, <a data-link-type="dfn" href="https://url.spec.whatwg.org/#opaque-host" id="ref-for-opaque-host①">opaque host</a>, or <a data-link-type="dfn" href="https://url.spec.whatwg.org/#empty-host" id="ref-for-empty-host①">empty host</a>.
+    Only the <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-domain" id="ref-for-concept-domain⑥">domain</a> format of <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-url-host" id="ref-for-concept-url-host④">host</a> is allowed here. This is for simplification and also is
     in recognition of various issues with using direct IP address identification in concert with
     PKI-based security.</p>
      <li id="GetAssn-DetermineRpId">
-      <a class="self-link" href="#GetAssn-DetermineRpId"></a> If <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-rpid" id="ref-for-dom-publickeycredentialrequestoptions-rpid">rpId</a></code></code> is not present, then set <var>rpId</var> to <var>effectiveDomain</var>. 
-      <p>Otherwise:</p>
-      <ol>
-       <li data-md>
-        <p>If <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-rpid" id="ref-for-dom-publickeycredentialrequestoptions-rpid①">rpId</a></code></code> <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#is-a-registrable-domain-suffix-of-or-is-equal-to" id="ref-for-is-a-registrable-domain-suffix-of-or-is-equal-to③">is not a registrable domain suffix of and is not
-equal to</a> <var>effectiveDomain</var>, throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror③">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①④">DOMException</a></code>.</p>
-       <li data-md>
-        <p>Set <var>rpId</var> to <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-rpid" id="ref-for-dom-publickeycredentialrequestoptions-rpid②">rpId</a></code></code>.</p>
-        <p class="note" role="note"><span class="marker">Note:</span> <var>rpId</var> represents the caller’s <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id①⑨">RP ID</a>. The <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⓪">RP ID</a> defaults to being the caller’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-settings-object-origin" id="ref-for-concept-settings-object-origin⑤">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain①①">effective domain</a> unless the caller has explicitly set <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-rpid" id="ref-for-dom-publickeycredentialrequestoptions-rpid③">rpId</a></code></code> when calling <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⓪">get()</a></code>.</p>
-      </ol>
+      <a class="self-link" href="#GetAssn-DetermineRpId"></a> If <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-rpid" id="ref-for-dom-publickeycredentialrequestoptions-rpid">rpId</a></code></code> 
+      <dl class="switch">
+       <dt data-md>is present
+       <dd data-md>
+        <p>If <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-rpid" id="ref-for-dom-publickeycredentialrequestoptions-rpid①">rpId</a></code></code> <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#is-a-registrable-domain-suffix-of-or-is-equal-to" id="ref-for-is-a-registrable-domain-suffix-of-or-is-equal-to③">is not a
+registrable domain suffix of and is not equal to</a> <var>effectiveDomain</var>, and if the client</p>
+        <dl class="switch">
+         <dt data-md>supports <a href="#sctn-related-origins">related origin requests</a>
+         <dd data-md>
+          <ol>
+           <li data-md>
+            <p>Let <var>rpIdRequested</var> be the value of <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-rpid" id="ref-for-dom-publickeycredentialrequestoptions-rpid②">rpId</a></code></code></p>
+           <li data-md>
+            <p>Run the <a data-link-type="abstract-op" href="#abstract-opdef-related-origins-validation-procedure" id="ref-for-abstract-opdef-related-origins-validation-procedure①">related origins validation procedure</a> with arguments <var>callerOrigin</var> and <var>rpIdRequested</var>.
+If the result is <code>false</code>, throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror④">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑤">DOMException</a></code>.</p>
+          </ol>
+         <dt data-md>does not support <a href="#sctn-related-origins">related origin requests</a>
+         <dd data-md>
+          <p>throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror⑤">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑥">DOMException</a></code>.</p>
+        </dl>
+       <dt data-md>is not present
+       <dd data-md>
+        <p>Set <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-rpid" id="ref-for-dom-publickeycredentialrequestoptions-rpid③">rpId</a></code></code> to <var>effectiveDomain</var>.</p>
+      </dl>
+      <p class="note" role="note"><span class="marker">Note:</span> <var>rpId</var> represents the caller’s <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id①⑨">RP ID</a>. The <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⓪">RP ID</a> defaults to being the caller’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-settings-object-origin" id="ref-for-concept-settings-object-origin⑤">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain①①">effective domain</a> unless the caller has explicitly set <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-rpid" id="ref-for-dom-publickeycredentialrequestoptions-rpid④">rpId</a></code></code> when calling <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⓪">get()</a></code>.</p>
      <li data-md>
       <p>Let <var>clientExtensions</var> be a new <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map③">map</a> and let <var>authenticatorExtensions</var> be a new <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map④">map</a>.</p>
      <li data-md>
@@ -3214,7 +3259,7 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
      <li data-md>
       <p>Let <var>authenticators</var> represent a value which at any given instant is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set③">set</a> of <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②②">client platform</a>-specific handles, where each <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item③">item</a> identifies an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑦⑥">authenticator</a> presently available on this <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②③">client platform</a> at that instant.</p>
       <p class="note" role="note"><span class="marker">Note:</span> What qualifies an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑦⑦">authenticator</a> as "available" is intentionally unspecified; this is meant to represent how <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑦⑧">authenticators</a> can be <a href="https://en.wikipedia.org/w/index.php?title=Hot_plug">hot-plugged</a> into (e.g., via USB)
-or discovered (e.g., via NFC or Bluetooth) by the <a data-link-type="dfn" href="#client" id="ref-for-client②④">client</a> by various mechanisms, or permanently built into the <a data-link-type="dfn" href="#client" id="ref-for-client②⑤">client</a>.</p>
+or discovered (e.g., via NFC or Bluetooth) by the <a data-link-type="dfn" href="#client" id="ref-for-client②⑥">client</a> by various mechanisms, or permanently built into the <a data-link-type="dfn" href="#client" id="ref-for-client②⑦">client</a>.</p>
      <li data-md>
       <p>Let <var>silentlyDiscoveredCredentials</var> be a new <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map⑥">map</a> whose <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-entry" id="ref-for-map-entry">entries</a> are of the form: <a data-link-type="dfn" href="#discoverablecredentialmetadata" id="ref-for-discoverablecredentialmetadata">DiscoverableCredentialMetadata</a> → <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑦⑨">authenticator</a>.</p>
      <li data-md>
@@ -3230,12 +3275,12 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
         <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①⓪">For each</a> <var>authenticator</var> in <var>issuedRequests</var> invoke the <a data-link-type="dfn" href="#authenticatorcancel" id="ref-for-authenticatorcancel⑥">authenticatorCancel</a> operation on <var>authenticator</var> and <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-remove" id="ref-for-list-remove①①">remove</a> <var>authenticator</var> from <var>issuedRequests</var>.</p>
        <dt data-md>If the user exercises a user agent user-interface option to cancel the process,
        <dd data-md>
-        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①①">For each</a> <var>authenticator</var> in <var>issuedRequests</var> invoke the <a data-link-type="dfn" href="#authenticatorcancel" id="ref-for-authenticatorcancel⑦">authenticatorCancel</a> operation on <var>authenticator</var> and <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-remove" id="ref-for-list-remove①②">remove</a> <var>authenticator</var> from <var>issuedRequests</var>. Throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror⑦">NotAllowedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑤">DOMException</a></code>.</p>
+        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①①">For each</a> <var>authenticator</var> in <var>issuedRequests</var> invoke the <a data-link-type="dfn" href="#authenticatorcancel" id="ref-for-authenticatorcancel⑦">authenticatorCancel</a> operation on <var>authenticator</var> and <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-remove" id="ref-for-list-remove①②">remove</a> <var>authenticator</var> from <var>issuedRequests</var>. Throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror⑦">NotAllowedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑦">DOMException</a></code>.</p>
        <dt data-md>If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-signal" id="ref-for-dom-credentialrequestoptions-signal②">signal</a></code></code> is present and <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-aborted" id="ref-for-abortsignal-aborted③">aborted</a>,
        <dd data-md>
         <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①②">For each</a> <var>authenticator</var> in <var>issuedRequests</var> invoke the <a data-link-type="dfn" href="#authenticatorcancel" id="ref-for-authenticatorcancel⑧">authenticatorCancel</a> operation on <var>authenticator</var> and <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-remove" id="ref-for-list-remove①③">remove</a> <var>authenticator</var> from <var>issuedRequests</var>. Then
 throw the <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-signal" id="ref-for-dom-credentialrequestoptions-signal③">signal</a></code></code>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#abortsignal-abort-reason" id="ref-for-abortsignal-abort-reason③">abort reason</a>.</p>
-       <dt id="GetAssn-ConditionalMediation-Interact-FormControl"><a class="self-link" href="#GetAssn-ConditionalMediation-Interact-FormControl"></a> If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-mediation" id="ref-for-dom-credentialrequestoptions-mediation③">mediation</a></code></code> is <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①⑤">conditional</a></code> and the user interacts with an <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/input.html#the-input-element" id="ref-for-the-input-element①">input</a></code> or <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/form-elements.html#the-textarea-element" id="ref-for-the-textarea-element">textarea</a></code> form control with an <code><a data-link-type="element-sub" href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#attr-fe-autocomplete" id="ref-for-attr-fe-autocomplete">autocomplete</a></code> attribute whose <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#non-autofill-credential-type" id="ref-for-non-autofill-credential-type">non-autofill credential type</a> is <code>"webauthn"</code>, 
+       <dt id="GetAssn-ConditionalMediation-Interact-FormControl"><a class="self-link" href="#GetAssn-ConditionalMediation-Interact-FormControl"></a> If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-mediation" id="ref-for-dom-credentialrequestoptions-mediation③">mediation</a></code></code> is <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①④">conditional</a></code> and the user interacts with an <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/input.html#the-input-element" id="ref-for-the-input-element①">input</a></code> or <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/form-elements.html#the-textarea-element" id="ref-for-the-textarea-element">textarea</a></code> form control with an <code><a data-link-type="element-sub" href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#attr-fe-autocomplete" id="ref-for-attr-fe-autocomplete">autocomplete</a></code> attribute whose <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#non-autofill-credential-type" id="ref-for-non-autofill-credential-type">non-autofill credential type</a> is <code>"webauthn"</code>, 
        <dd data-md>
         <div class="note" role="note">
           Note: The <code>"webauthn"</code> <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#autofill-detail-tokens" id="ref-for-autofill-detail-tokens①">autofill detail token</a> must appear immediately after the last <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#autofill-detail-tokens" id="ref-for-autofill-detail-tokens②">autofill detail token</a> of type "Normal" or "Contact". For example: 
@@ -3271,17 +3316,17 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
             </ol>
           </ol>
         </ol>
-       <dt data-md>If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-mediation" id="ref-for-dom-credentialrequestoptions-mediation④">mediation</a></code></code> is not <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①⑥">conditional</a></code>, <var>issuedRequests</var> is empty, <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials⑧">allowCredentials</a></code></code> is not empty,
+       <dt data-md>If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-mediation" id="ref-for-dom-credentialrequestoptions-mediation④">mediation</a></code></code> is not <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①⑤">conditional</a></code>, <var>issuedRequests</var> is empty, <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials⑧">allowCredentials</a></code></code> is not empty,
 and no <var>authenticator</var> will become available for any <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential②⑧">public key credentials</a> therein,
        <dd data-md>
-        <p>Indicate to the user that no eligible credential could be found. When the user acknowledges the dialog, throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror⑧">NotAllowedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑥">DOMException</a></code>.</p>
+        <p>Indicate to the user that no eligible credential could be found. When the user acknowledges the dialog, throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror⑧">NotAllowedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑧">DOMException</a></code>.</p>
         <p class="note" role="note"><span class="marker">Note:</span> One way a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②④">client platform</a> can determine that no <var>authenticator</var> will become available is by examining the <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports⑤">transports</a></code></code> members of the present <code><code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor②">PublicKeyCredentialDescriptor</a></code></code> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item⑤">items</a> of <code><var>pkOptions</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials⑨">allowCredentials</a></code></code>, if any. For example, if all <code><code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor③">PublicKeyCredentialDescriptor</a></code></code> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item⑥">items</a> list only <code><code class="idl"><a data-link-type="idl" href="#dom-authenticatortransport-internal" id="ref-for-dom-authenticatortransport-internal">internal</a></code></code>, but all <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators①③">platform</a> <var>authenticator</var>s have been tried, then there is no possibility of satisfying the request. Alternatively, all <code><code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor④">PublicKeyCredentialDescriptor</a></code></code> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item⑦">items</a> may list <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports⑥">transports</a></code></code> that the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②⑤">client platform</a> does not support.</p>
        <dt data-md>If an <var>authenticator</var> becomes available on this <a data-link-type="dfn" href="#client-device" id="ref-for-client-device①④">client device</a>,
        <dd data-md>
         <p class="note" role="note"><span class="marker">Note:</span> This includes the case where an <var>authenticator</var> was available upon <var>lifetimeTimer</var> initiation.</p>
         <ol>
          <li data-md>
-          <p>If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-mediation" id="ref-for-dom-credentialrequestoptions-mediation⑤">mediation</a></code></code> is <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①⑦">conditional</a></code> and the <var>authenticator</var> supports the <a data-link-type="dfn" href="#silentcredentialdiscovery" id="ref-for-silentcredentialdiscovery">silentCredentialDiscovery</a> operation:</p>
+          <p>If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-mediation" id="ref-for-dom-credentialrequestoptions-mediation⑤">mediation</a></code></code> is <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①⑥">conditional</a></code> and the <var>authenticator</var> supports the <a data-link-type="dfn" href="#silentcredentialdiscovery" id="ref-for-silentcredentialdiscovery">silentCredentialDiscovery</a> operation:</p>
           <ol>
            <li data-md>
             <p>Let <var>collectedDiscoveredCredentialMetadata</var> be the result of invoking the <a data-link-type="dfn" href="#silentcredentialdiscovery" id="ref-for-silentcredentialdiscovery①">silentCredentialDiscovery</a> operation on <var>authenticator</var> with <var>rpId</var> as parameter.</p>
@@ -3301,7 +3346,7 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
            <li data-md>
             <p>Execute the <a data-link-type="dfn" href="#publickeycredential-issuing-a-credential-request-to-an-authenticator" id="ref-for-publickeycredential-issuing-a-credential-request-to-an-authenticator①">issuing a credential request to an authenticator</a> algorithm with <var>authenticator</var>, <var>savedCredentialIds</var>, <var>pkOptions</var>, <var>rpId</var>, <var>clientDataHash</var>, and <var>authenticatorExtensions</var>.</p>
             <p>If this returns <code>false</code>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue①④">continue</a>.</p>
-            <p class="note" role="note"><span class="marker">Note:</span> This branch is taken if <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-mediation" id="ref-for-dom-credentialrequestoptions-mediation⑥">mediation</a></code></code> is <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①⑧">conditional</a></code> and the <var>authenticator</var> does not support the <a data-link-type="dfn" href="#silentcredentialdiscovery" id="ref-for-silentcredentialdiscovery②">silentCredentialDiscovery</a> operation to allow use of such authenticators during a <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①⑨">conditional</a></code> <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#user-mediated" id="ref-for-user-mediated⑤">user mediation</a> request.</p>
+            <p class="note" role="note"><span class="marker">Note:</span> This branch is taken if <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-mediation" id="ref-for-dom-credentialrequestoptions-mediation⑥">mediation</a></code></code> is <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①⑦">conditional</a></code> and the <var>authenticator</var> does not support the <a data-link-type="dfn" href="#silentcredentialdiscovery" id="ref-for-silentcredentialdiscovery②">silentCredentialDiscovery</a> operation to allow use of such authenticators during a <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①⑧">conditional</a></code> <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#user-mediated" id="ref-for-user-mediated④">user mediation</a> request.</p>
            <li data-md>
             <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append②">Append</a> <var>authenticator</var> to <var>issuedRequests</var>.</p>
           </ol>
@@ -3401,14 +3446,14 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
         </ol>
       </dl>
      <li data-md>
-      <p>Throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror⑨">NotAllowedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑦">DOMException</a></code>. In order to prevent information leak that could identify the
+      <p>Throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror⑨">NotAllowedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑨">DOMException</a></code>. In order to prevent information leak that could identify the
 user without <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent①⓪">consent</a>, this step MUST NOT be executed before <var>lifetimeTimer</var> has expired. See <a href="#sctn-assertion-privacy">§ 14.5.2 Authentication Ceremony Privacy</a> for details.</p>
     </ol>
    </div>
    <h5 class="heading settled" data-level="5.1.4.2" id="sctn-issuing-cred-request-to-authenticator"><span class="secno">5.1.4.2. </span><span class="content"><dfn class="dfn-paneled algorithm" data-algorithm="Issuing a credential request to an authenticator" data-dfn-for="PublicKeyCredential" data-dfn-type="dfn" data-noexport id="publickeycredential-issuing-a-credential-request-to-an-authenticator">Issuing a Credential Request to an Authenticator</dfn></span><a class="self-link" href="#sctn-issuing-cred-request-to-authenticator"></a></h5>
    <p>This sub-algorithm of <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-slot" id="ref-for-dom-publickeycredential-discoverfromexternalsource-slot③">[[DiscoverFromExternalSource]]()</a></code> encompasses the specific UI context-independent
 steps necessary for requesting a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential⑨">credential</a> from a given <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑧④">authenticator</a>, using given <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions②">PublicKeyCredentialRequestOptions</a></code>.
-It is called by <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-slot" id="ref-for-dom-publickeycredential-discoverfromexternalsource-slot④">[[DiscoverFromExternalSource]]()</a></code> from various points depending on which <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#user-mediated" id="ref-for-user-mediated⑥">user mediation</a> the present <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①①">authentication ceremony</a> is subject to (e.g.: <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional②⓪">conditional</a></code> mediation).</p>
+It is called by <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-slot" id="ref-for-dom-publickeycredential-discoverfromexternalsource-slot④">[[DiscoverFromExternalSource]]()</a></code> from various points depending on which <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#user-mediated" id="ref-for-user-mediated⑤">user mediation</a> the present <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①①">authentication ceremony</a> is subject to (e.g.: <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional①⑨">conditional</a></code> mediation).</p>
    <p>This algorithm accepts the following arguments:</p>
    <dl>
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="Issuing a credential request to an authenticator" data-dfn-type="argument" data-export id="dom-issuing-a-credential-request-to-an-authenticator-authenticator"><code>authenticator</code></dfn>
@@ -3430,7 +3475,7 @@ <h5 class="heading settled" data-level="5.1.4.2" id="sctn-issuing-cred-request-t
     <dd data-md>
      <p>A <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map⑧">map</a> containing <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier③">extension identifiers</a> to the <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding⑦">base64url encoding</a> of the <a data-link-type="dfn" href="#client-extension-processing" id="ref-for-client-extension-processing⑤">client extension processing</a> output for <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension②">authenticator extensions</a>.</p>
    </dl>
-   <p>This algorithm returns <code>false</code> if the <a data-link-type="dfn" href="#client" id="ref-for-client②⑥">client</a> determines that the <var>authenticator</var> is not capable of handling the request, or <code>true</code> if
+   <p>This algorithm returns <code>false</code> if the <a data-link-type="dfn" href="#client" id="ref-for-client②⑧">client</a> determines that the <var>authenticator</var> is not capable of handling the request, or <code>true</code> if
 the request was issued successfully.</p>
    <p>The steps for <a data-link-type="dfn" href="#publickeycredential-issuing-a-credential-request-to-an-authenticator" id="ref-for-publickeycredential-issuing-a-credential-request-to-an-authenticator②">issuing a credential request to an authenticator</a> are as follows:</p>
    <ol>
@@ -3527,13 +3572,13 @@ <h4 class="heading settled" data-level="5.1.5" id="sctn-storeCredential"><span c
     <p>When this method is invoked, the user agent MUST execute the following algorithm:</p>
     <ol>
      <li data-md>
-      <p>Throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror①">NotSupportedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑧">DOMException</a></code>.</p>
+      <p>Throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror①">NotSupportedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②⓪">DOMException</a></code>.</p>
     </ol>
    </div>
    <h4 class="heading settled" data-level="5.1.6" id="sctn-isUserVerifyingPlatformAuthenticatorAvailable"><span class="secno">5.1.6. </span><span class="content">Availability of <a data-link-type="dfn" href="#user-verifying-platform-authenticator" id="ref-for-user-verifying-platform-authenticator②">User-Verifying Platform Authenticator</a> - PublicKeyCredential’s <code>isUserVerifyingPlatformAuthenticatorAvailable()</code> Method</span><a class="self-link" href="#sctn-isUserVerifyingPlatformAuthenticatorAvailable"></a></h4>
    <div data-link-for-hint="WebAuthentication/isUserVerifyingPlatformAuthenticatorAvailable">
     <p><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①③">WebAuthn Relying Parties</a> use this method to determine whether they can create a new credential using a <a data-link-type="dfn" href="#user-verifying-platform-authenticator" id="ref-for-user-verifying-platform-authenticator③">user-verifying platform authenticator</a>.
-Upon invocation, the <a data-link-type="dfn" href="#client" id="ref-for-client②⑦">client</a> employs a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②⑨">client platform</a>-specific procedure to discover available <a data-link-type="dfn" href="#user-verifying-platform-authenticator" id="ref-for-user-verifying-platform-authenticator④">user-verifying platform authenticators</a>.
+Upon invocation, the <a data-link-type="dfn" href="#client" id="ref-for-client②⑨">client</a> employs a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②⑨">client platform</a>-specific procedure to discover available <a data-link-type="dfn" href="#user-verifying-platform-authenticator" id="ref-for-user-verifying-platform-authenticator④">user-verifying platform authenticators</a>.
 If any are discovered, the promise is resolved with the value of <code>true</code>.
 Otherwise, the promise is resolved with the value of <code>false</code>.
 Based on the result, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⑧">Relying Party</a> can take further actions to guide the user to create a credential.</p>
@@ -3542,12 +3587,12 @@ <h4 class="heading settled" data-level="5.1.6" id="sctn-isUserVerifyingPlatformA
     <c- b>static</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise" id="ref-for-idl-promise⑤"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①"><c- b>boolean</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="method" data-export data-lt="isUserVerifyingPlatformAuthenticatorAvailable()" id="dom-publickeycredential-isuserverifyingplatformauthenticatoravailable"><code><c- g>isUserVerifyingPlatformAuthenticatorAvailable</c-></code></dfn>();
 };
 </pre>
-    <p class="note" role="note"><span class="marker">Note:</span> Invoking this method from a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#browsing-context" id="ref-for-browsing-context">browsing context</a> where the <a data-link-type="dfn" href="#web-authentication-api" id="ref-for-web-authentication-api①②">Web Authentication API</a> is "disabled" according to the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#allowed-to-use" id="ref-for-allowed-to-use">allowed to use</a> algorithm—i.e., by a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/dom.html#concept-document-permissions-policy" id="ref-for-concept-document-permissions-policy②">permissions policy</a>—will result in the promise being rejected with a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑨">DOMException</a></code> whose name is "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror①⓪">NotAllowedError</a></code>". See also <a href="#sctn-permissions-policy">§ 5.9 Permissions Policy integration</a>.</p>
+    <p class="note" role="note"><span class="marker">Note:</span> Invoking this method from a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#browsing-context" id="ref-for-browsing-context">browsing context</a> where the <a data-link-type="dfn" href="#web-authentication-api" id="ref-for-web-authentication-api①②">Web Authentication API</a> is "disabled" according to the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#allowed-to-use" id="ref-for-allowed-to-use">allowed to use</a> algorithm—i.e., by a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/dom.html#concept-document-permissions-policy" id="ref-for-concept-document-permissions-policy②">permissions policy</a>—will result in the promise being rejected with a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②①">DOMException</a></code> whose name is "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror①⓪">NotAllowedError</a></code>". See also <a href="#sctn-permissions-policy">§ 5.9 Permissions Policy integration</a>.</p>
    </div>
-   <h4 class="heading settled" data-level="5.1.7" id="sctn-getClientCapabilities"><span class="secno">5.1.7. </span><span class="content">Availability of <a data-link-type="dfn" href="#client" id="ref-for-client②⑧">client</a> capabilities - PublicKeyCredential’s <code>getClientCapabilities()</code> Method</span><a class="self-link" href="#sctn-getClientCapabilities"></a></h4>
+   <h4 class="heading settled" data-level="5.1.7" id="sctn-getClientCapabilities"><span class="secno">5.1.7. </span><span class="content">Availability of <a data-link-type="dfn" href="#client" id="ref-for-client③⓪">client</a> capabilities - PublicKeyCredential’s <code>getClientCapabilities()</code> Method</span><a class="self-link" href="#sctn-getClientCapabilities"></a></h4>
    <div data-link-for-hint="WebAuthentication/getClientCapabilities">
-    <p><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①④">WebAuthn Relying Parties</a> use this method to determine the availability of a limited set of <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client⑥">client</a> capabilities to offer certain workflows and experiences to users. For example, an RP may offer a sign in button on clients where only <code class="idl"><a data-link-type="idl" href="#dom-authenticatortransport-hybrid" id="ref-for-dom-authenticatortransport-hybrid">hybrid</a></code> transport is available or where <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional②①">conditional</a></code> mediation is unavailable (instead of showing a username field).</p>
-    <p>Upon invocation, the <a data-link-type="dfn" href="#client" id="ref-for-client②⑨">client</a> employs a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③⓪">client platform</a>-specific procedure to discover availablity of these capabilities.</p>
+    <p><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①④">WebAuthn Relying Parties</a> use this method to determine the availability of a limited set of <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client⑥">client</a> capabilities to offer certain workflows and experiences to users. For example, an RP may offer a sign in button on clients where only <code class="idl"><a data-link-type="idl" href="#dom-authenticatortransport-hybrid" id="ref-for-dom-authenticatortransport-hybrid">hybrid</a></code> transport is available or where <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional②⓪">conditional</a></code> mediation is unavailable (instead of showing a username field).</p>
+    <p>Upon invocation, the <a data-link-type="dfn" href="#client" id="ref-for-client③①">client</a> employs a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③⓪">client platform</a>-specific procedure to discover availablity of these capabilities.</p>
     <p>This method has no arguments and returns a record of capability keys to Boolean values.</p>
 <pre class="idl highlight def"><c- b>partial</c-> <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#publickeycredential" id="ref-for-publickeycredential①⑧"><c- g>PublicKeyCredential</c-></a> {
     <c- b>static</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise" id="ref-for-idl-promise⑥"><c- b>Promise</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-publickeycredentialclientcapabilities" id="ref-for-typedefdef-publickeycredentialclientcapabilities"><c- n>PublicKeyCredentialClientCapabilities</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="method" data-export data-lt="getClientCapabilities()" id="dom-publickeycredential-getclientcapabilities"><code><c- g>getClientCapabilities</c-></code></dfn>();
@@ -3563,19 +3608,19 @@ <h4 class="heading settled" data-level="5.1.7" id="sctn-getClientCapabilities"><
 When a capability does not <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists">exist</a> as a key, the availability of the client feature is not known.</p>
     <p>The set of <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-getting-the-keys" id="ref-for-map-getting-the-keys②">keys</a> SHOULD also contain a key for each <a href="#sctn-extensions">extension</a> implemented by the client, where the key is formed by prefixing the string <code>extension:</code> to the <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier④">extension identifier</a>. The associated value for each implemented extension SHOULD be <code>true</code>. If <code>getClientCapabilities()</code> is supported by a client, but an extension is not mapped to the value <code>true</code>, then a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⑨">Relying Party</a> MAY assume that client processing steps for that extension will not be carried out by this client and that the extension MAY not be forwarded to the authenticator.</p>
     <p class="note" role="note"><span class="marker">Note:</span> Even if an extension is mapped to <code>true</code>, the authenticator used for any given operation may not support that extension, so <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⓪">Relying Parties</a> MUST NOT assume that the authenticator processing steps for that extension will be performed on that basis.</p>
-    <p class="note" role="note"><span class="marker">Note:</span> Invoking this method from a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#browsing-context" id="ref-for-browsing-context①">browsing context</a> where the <a data-link-type="dfn" href="#web-authentication-api" id="ref-for-web-authentication-api①③">Web Authentication API</a> is "disabled" according to the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#allowed-to-use" id="ref-for-allowed-to-use①">allowed to use</a> algorithm—i.e., by a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/dom.html#concept-document-permissions-policy" id="ref-for-concept-document-permissions-policy③">permissions policy</a>—will result in the promise being rejected with a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②⓪">DOMException</a></code> whose name is "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror①①">NotAllowedError</a></code>". See also <a href="#sctn-permissions-policy">§ 5.9 Permissions Policy integration</a>.</p>
+    <p class="note" role="note"><span class="marker">Note:</span> Invoking this method from a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#browsing-context" id="ref-for-browsing-context①">browsing context</a> where the <a data-link-type="dfn" href="#web-authentication-api" id="ref-for-web-authentication-api①③">Web Authentication API</a> is "disabled" according to the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#allowed-to-use" id="ref-for-allowed-to-use①">allowed to use</a> algorithm—i.e., by a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/dom.html#concept-document-permissions-policy" id="ref-for-concept-document-permissions-policy③">permissions policy</a>—will result in the promise being rejected with a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②②">DOMException</a></code> whose name is "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror①①">NotAllowedError</a></code>". See also <a href="#sctn-permissions-policy">§ 5.9 Permissions Policy integration</a>.</p>
    </div>
    <h4 class="heading settled" data-level="5.1.8" id="sctn-parseCreationOptionsFromJSON"><span class="secno">5.1.8. </span><span class="content">Deserialize Registration ceremony options - PublicKeyCredential’s <code>parseCreationOptionsFromJSON()</code> Method</span><a class="self-link" href="#sctn-parseCreationOptionsFromJSON"></a></h4>
    <div data-link-for-hint="WebAuthentication/parseCreationOptionsFromJSON">
     <p><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①⑤">WebAuthn Relying Parties</a> use this method to convert <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-json-types" id="ref-for-dfn-json-types①">JSON type</a> representations of options for <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①④">navigator.credentials.create()</a></code> into <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions②">PublicKeyCredentialCreationOptions</a></code>.</p>
-    <p>Upon invocation, the <a data-link-type="dfn" href="#client" id="ref-for-client③⓪">client</a> MUST convert the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-parsecreationoptionsfromjson-options-options" id="ref-for-dom-publickeycredential-parsecreationoptionsfromjson-options-options">options</a></code> argument into a new,
+    <p>Upon invocation, the <a data-link-type="dfn" href="#client" id="ref-for-client③②">client</a> MUST convert the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-parsecreationoptionsfromjson-options-options" id="ref-for-dom-publickeycredential-parsecreationoptionsfromjson-options-options">options</a></code> argument into a new,
 identically-structured <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions③">PublicKeyCredentialCreationOptions</a></code> object, using <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding⑧">base64url encoding</a> to decode any <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①③">DOMString</a></code> attributes in <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptionsjson" id="ref-for-dictdef-publickeycredentialcreationoptionsjson">PublicKeyCredentialCreationOptionsJSON</a></code> that correspond
 to <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-buffer-source-type" id="ref-for-dfn-buffer-source-type">buffer source type</a> attributes in <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions④">PublicKeyCredentialCreationOptions</a></code>. This conversion MUST
-also apply to any <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input">client extension inputs</a> processed by the <a data-link-type="dfn" href="#client" id="ref-for-client③①">client</a>.</p>
+also apply to any <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input">client extension inputs</a> processed by the <a data-link-type="dfn" href="#client" id="ref-for-client③③">client</a>.</p>
     <p><code class="idl"><a data-link-type="idl" href="#dictdef-authenticationextensionsclientinputsjson" id="ref-for-dictdef-authenticationextensionsclientinputsjson">AuthenticationExtensionsClientInputsJSON</a></code> MAY include extensions registered in the IANA
 "WebAuthn Extension Identifiers" registry <a data-link-type="biblio" href="#biblio-iana-webauthn-registries" title="Web Authentication (WebAuthn) registries">[IANA-WebAuthn-Registries]</a> but not defined in <a href="#sctn-extensions">§ 9 WebAuthn Extensions</a>.</p>
-    <p>If the <a data-link-type="dfn" href="#client" id="ref-for-client③②">client</a> encounters any issues parsing any of the <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-json-types" id="ref-for-dfn-json-types②">JSON type</a> representations then it
-MUST throw an "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#encodingerror" id="ref-for-encodingerror">EncodingError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②①">DOMException</a></code> with a description of the incompatible
+    <p>If the <a data-link-type="dfn" href="#client" id="ref-for-client③④">client</a> encounters any issues parsing any of the <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-json-types" id="ref-for-dfn-json-types②">JSON type</a> representations then it
+MUST throw an "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#encodingerror" id="ref-for-encodingerror">EncodingError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②③">DOMException</a></code> with a description of the incompatible
 value and terminate the operation.</p>
 <pre class="idl highlight def"><c- b>partial</c-> <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#publickeycredential" id="ref-for-publickeycredential①⑨"><c- g>PublicKeyCredential</c-></a> {
     <c- b>static</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions⑤"><c- n>PublicKeyCredentialCreationOptions</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="method" data-export data-lt="parseCreationOptionsFromJSON(options)" id="dom-publickeycredential-parsecreationoptionsfromjson"><code><c- g>parseCreationOptionsFromJSON</c-></code></dfn>(<a data-link-type="idl-name" href="#dictdef-publickeycredentialcreationoptionsjson" id="ref-for-dictdef-publickeycredentialcreationoptionsjson①"><c- n>PublicKeyCredentialCreationOptionsJSON</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential/parseCreationOptionsFromJSON(options)" data-dfn-type="argument" data-export id="dom-publickeycredential-parsecreationoptionsfromjson-options-options"><code><c- g>options</c-></code></dfn>);
@@ -3614,14 +3659,14 @@ <h4 class="heading settled" data-level="5.1.8" id="sctn-parseCreationOptionsFrom
    <h4 class="heading settled" data-level="5.1.9" id="sctn-parseRequestOptionsFromJSON"><span class="secno">5.1.9. </span><span class="content">Deserialize Authentication ceremony options - PublicKeyCredential’s <code>parseRequestOptionsFromJSON()</code> Methods</span><a class="self-link" href="#sctn-parseRequestOptionsFromJSON"></a></h4>
    <div data-link-for-hint="WebAuthentication/parseRequestOptionsFromJSON">
     <p><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①⑥">WebAuthn Relying Parties</a> use this method to convert <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-json-types" id="ref-for-dfn-json-types③">JSON type</a> representations of options for <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②①">navigator.credentials.get()</a></code> into <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions④">PublicKeyCredentialRequestOptions</a></code>.</p>
-    <p>Upon invocation, the <a data-link-type="dfn" href="#client" id="ref-for-client③③">client</a> MUST convert the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-parserequestoptionsfromjson-options-options" id="ref-for-dom-publickeycredential-parserequestoptionsfromjson-options-options">options</a></code> argument into a new,
+    <p>Upon invocation, the <a data-link-type="dfn" href="#client" id="ref-for-client③⑤">client</a> MUST convert the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-parserequestoptionsfromjson-options-options" id="ref-for-dom-publickeycredential-parserequestoptionsfromjson-options-options">options</a></code> argument into a new,
 identically-structured <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions⑤">PublicKeyCredentialRequestOptions</a></code> object, using <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding⑨">base64url encoding</a> to decode any <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②①">DOMString</a></code> attributes in <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptionsjson" id="ref-for-dictdef-publickeycredentialrequestoptionsjson">PublicKeyCredentialRequestOptionsJSON</a></code> that correspond
 to <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-buffer-source-type" id="ref-for-dfn-buffer-source-type①">buffer source type</a> attributes in <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions⑥">PublicKeyCredentialRequestOptions</a></code>. This conversion MUST
-also apply to any <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①">client extension inputs</a> processed by the <a data-link-type="dfn" href="#client" id="ref-for-client③④">client</a>.</p>
+also apply to any <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①">client extension inputs</a> processed by the <a data-link-type="dfn" href="#client" id="ref-for-client③⑥">client</a>.</p>
     <p><code class="idl"><a data-link-type="idl" href="#dictdef-authenticationextensionsclientinputsjson" id="ref-for-dictdef-authenticationextensionsclientinputsjson②">AuthenticationExtensionsClientInputsJSON</a></code> MAY include extensions registered in the IANA
 "WebAuthn Extension Identifiers" registry <a data-link-type="biblio" href="#biblio-iana-webauthn-registries" title="Web Authentication (WebAuthn) registries">[IANA-WebAuthn-Registries]</a> but not defined in <a href="#sctn-extensions">§ 9 WebAuthn Extensions</a>.</p>
-    <p>If the <a data-link-type="dfn" href="#client" id="ref-for-client③⑤">client</a> encounters any issues parsing any of the <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-json-types" id="ref-for-dfn-json-types④">JSON type</a> representations then it
-MUST throw an "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#encodingerror" id="ref-for-encodingerror①">EncodingError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②②">DOMException</a></code> with a description of the incompatible
+    <p>If the <a data-link-type="dfn" href="#client" id="ref-for-client③⑦">client</a> encounters any issues parsing any of the <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-json-types" id="ref-for-dfn-json-types④">JSON type</a> representations then it
+MUST throw an "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#encodingerror" id="ref-for-encodingerror①">EncodingError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②④">DOMException</a></code> with a description of the incompatible
 value and terminate the operation.</p>
 <pre class="idl highlight def"><c- b>partial</c-> <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#publickeycredential" id="ref-for-publickeycredential②⓪"><c- g>PublicKeyCredential</c-></a> {
     <c- b>static</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions⑦"><c- n>PublicKeyCredentialRequestOptions</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="method" data-export data-lt="parseRequestOptionsFromJSON(options)" id="dom-publickeycredential-parserequestoptionsfromjson"><code><c- g>parseRequestOptionsFromJSON</c-></code></dfn>(<a data-link-type="idl-name" href="#dictdef-publickeycredentialrequestoptionsjson" id="ref-for-dictdef-publickeycredentialrequestoptionsjson①"><c- n>PublicKeyCredentialRequestOptionsJSON</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential/parseRequestOptionsFromJSON(options)" data-dfn-type="argument" data-export id="dom-publickeycredential-parserequestoptionsfromjson-options-options"><code><c- g>options</c-></code></dfn>);
@@ -3664,7 +3709,7 @@ <h4 class="heading settled" data-level="5.2.1" id="iface-authenticatorattestatio
     <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑧"><c- b>sequence</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⑤"><c- b>DOMString</c-></a>>                              <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="method" data-export data-lt="getTransports()" id="dom-authenticatorattestationresponse-gettransports"><code><c- g>getTransports</c-></code></dfn>();
     <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①⑦"><c- b>ArrayBuffer</c-></a>                                      <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="method" data-export data-lt="getAuthenticatorData()" id="dom-authenticatorattestationresponse-getauthenticatordata"><code><c- g>getAuthenticatorData</c-></code></dfn>();
     <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①⑧"><c- b>ArrayBuffer</c-></a>?                                     <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="method" data-export data-lt="getPublicKey()" id="dom-authenticatorattestationresponse-getpublickey"><code><c- g>getPublicKey</c-></code></dfn>();
-    <a data-link-type="idl-name" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier②"><c- n>COSEAlgorithmIdentifier</c-></a>                          <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="method" data-export data-lt="getPublicKeyAlgorithm()" id="dom-authenticatorattestationresponse-getpublickeyalgorithm"><code><c- g>getPublicKeyAlgorithm</c-></code></dfn>();
+    <a data-link-type="idl-name" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier③"><c- n>COSEAlgorithmIdentifier</c-></a>                          <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="method" data-export data-lt="getPublicKeyAlgorithm()" id="dom-authenticatorattestationresponse-getpublickeyalgorithm"><code><c- g>getPublicKeyAlgorithm</c-></code></dfn>();
 };
 </pre>
    <div>
@@ -3692,7 +3737,7 @@ <h4 class="heading settled" data-level="5.2.1" id="iface-authenticatorattestatio
       <p>This operation returns the DER <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc5280#section-4.1.2.7" id="ref-for-section-4.1.2.7">SubjectPublicKeyInfo</a> of the new credential, or null if this is not available. See <a href="#sctn-public-key-easy">§ 5.2.1.1 Easily accessing credential data</a>.</p>
      <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickeyalgorithm" id="ref-for-dom-authenticatorattestationresponse-getpublickeyalgorithm①">getPublicKeyAlgorithm()</a></code>
      <dd data-md>
-      <p>This operation returns the <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier③">COSEAlgorithmIdentifier</a></code> of the new credential. See <a href="#sctn-public-key-easy">§ 5.2.1.1 Easily accessing credential data</a>.</p>
+      <p>This operation returns the <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier④">COSEAlgorithmIdentifier</a></code> of the new credential. See <a href="#sctn-public-key-easy">§ 5.2.1.1 Easily accessing credential data</a>.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="attribute" data-export id="dom-authenticatorattestationresponse-transports-slot"><code>[[transports]]</code></dfn>
      <dd data-md>
       <p>This <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots①⑧">internal slot</a> contains a sequence of zero or more unique <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⑥">DOMString</a></code>s in lexicographical order. These values are the transports that the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨①">authenticator</a> is believed to support, or an empty sequence if the information is unavailable. The values SHOULD be members of <code class="idl"><a data-link-type="idl" href="#enumdef-authenticatortransport" id="ref-for-enumdef-authenticatortransport①">AuthenticatorTransport</a></code> but <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①③">Relying Parties</a> SHOULD accept and store unknown values.</p>
@@ -3702,7 +3747,7 @@ <h5 class="heading settled" data-level="5.2.1.1" id="sctn-public-key-easy"><span
    <p>Every user of the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-create-slot" id="ref-for-dom-publickeycredential-create-slot②">[[Create]](origin, options, sameOriginWithAncestors)</a></code> method will need to parse and store the returned <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①④">credential public key</a> in order to verify future <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①⓪">authentication assertions</a>. However, the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①⑤">credential public key</a> is in COSE format <a data-link-type="biblio" href="#biblio-rfc9052" title="CBOR Object Signing and Encryption (COSE): Structures and Process">[RFC9052]</a>, inside the <a data-link-type="dfn" href="#authdata-attestedcredentialdata-credentialpublickey" id="ref-for-authdata-attestedcredentialdata-credentialpublickey">credentialPublicKey</a> member of the <a data-link-type="dfn" href="#authdata-attestedcredentialdata" id="ref-for-authdata-attestedcredentialdata①">attestedCredentialData</a>, inside the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data⑨">authenticator data</a>, inside the <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object⑥">attestation object</a> conveyed by <code class="idl"><a data-link-type="idl" href="#authenticatorattestationresponse" id="ref-for-authenticatorattestationresponse④">AuthenticatorAttestationResponse</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-attestationobject" id="ref-for-dom-authenticatorattestationresponse-attestationobject④">attestationObject</a></code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①④">Relying Parties</a> wishing to use <a data-link-type="dfn" href="#attestation" id="ref-for-attestation⑧">attestation</a> are obliged to do the work of parsing the <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-attestationobject" id="ref-for-dom-authenticatorattestationresponse-attestationobject⑤">attestationObject</a></code> and obtaining the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①⑥">credential public key</a> because that public key copy is the one the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨②">authenticator</a> <a href="#signing-procedure" id="ref-for-signing-procedure">signed</a>. However, many valid WebAuthn use cases do not require <a data-link-type="dfn" href="#attestation" id="ref-for-attestation⑨">attestation</a>. For those uses, user agents can do the work of parsing, expose the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①⓪">authenticator data</a> directly, and translate the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①⑦">credential public key</a> into a more convenient format.</p>
    <p>The <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickey" id="ref-for-dom-authenticatorattestationresponse-getpublickey②">getPublicKey()</a></code> operation thus returns the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①⑧">credential public key</a> as a <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc5280#section-4.1.2.7" id="ref-for-section-4.1.2.7①">SubjectPublicKeyInfo</a>. This <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②⓪">ArrayBuffer</a></code> can, for example, be passed to Java’s <code>java.security.spec.X509EncodedKeySpec</code>, .NET’s <code>System.Security.Cryptography.ECDsa.ImportSubjectPublicKeyInfo</code>, or Go’s <code>crypto/x509.ParsePKIXPublicKey</code>.</p>
    <p>Use of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickey" id="ref-for-dom-authenticatorattestationresponse-getpublickey③">getPublicKey()</a></code> does impose some limitations: by using <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-pubkeycredparams" id="ref-for-dom-publickeycredentialcreationoptions-pubkeycredparams②">pubKeyCredParams</a></code>, a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⑤">Relying Party</a> can negotiate with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨③">authenticator</a> to use public key algorithms that the user agent may not understand. However, if the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⑥">Relying Party</a> does so, the user agent will not be able to translate the resulting <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①⑨">credential public key</a> into <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc5280#section-4.1.2.7" id="ref-for-section-4.1.2.7②">SubjectPublicKeyInfo</a> format and the return value of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickey" id="ref-for-dom-authenticatorattestationresponse-getpublickey④">getPublicKey()</a></code> will be null.</p>
-   <p>User agents MUST be able to return a non-null value for <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickey" id="ref-for-dom-authenticatorattestationresponse-getpublickey⑤">getPublicKey()</a></code> when the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②⓪">credential public key</a> has a <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier④">COSEAlgorithmIdentifier</a></code> value of:</p>
+   <p>User agents MUST be able to return a non-null value for <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickey" id="ref-for-dom-authenticatorattestationresponse-getpublickey⑤">getPublicKey()</a></code> when the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②⓪">credential public key</a> has a <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier⑤">COSEAlgorithmIdentifier</a></code> value of:</p>
    <ul>
     <li data-md>
      <p>-7 (ES256), where <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc9052#name-cose-key-common-parameters" id="ref-for-name-cose-key-common-parameters">kty</a> is 2 (with uncompressed points) and <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc9053#name-double-coordinate-curves" id="ref-for-name-double-coordinate-curves">crv</a> is 1 (P-256).</p>
@@ -3711,7 +3756,7 @@ <h5 class="heading settled" data-level="5.2.1.1" id="sctn-public-key-easy"><span
     <li data-md>
      <p>-8 (EdDSA), where <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc9053#name-double-coordinate-curves" id="ref-for-name-double-coordinate-curves①">crv</a> is 6 (Ed25519).</p>
    </ul>
-   <p>A <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc5280#section-4.1.2.7" id="ref-for-section-4.1.2.7③">SubjectPublicKeyInfo</a> does not include information about the signing algorithm (for example, which hash function to use) that is included in the COSE public key. To provide this, <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickeyalgorithm" id="ref-for-dom-authenticatorattestationresponse-getpublickeyalgorithm②">getPublicKeyAlgorithm()</a></code> returns the <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier⑤">COSEAlgorithmIdentifier</a></code> for the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②①">credential public key</a>.</p>
+   <p>A <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc5280#section-4.1.2.7" id="ref-for-section-4.1.2.7③">SubjectPublicKeyInfo</a> does not include information about the signing algorithm (for example, which hash function to use) that is included in the COSE public key. To provide this, <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickeyalgorithm" id="ref-for-dom-authenticatorattestationresponse-getpublickeyalgorithm②">getPublicKeyAlgorithm()</a></code> returns the <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier⑥">COSEAlgorithmIdentifier</a></code> for the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②①">credential public key</a>.</p>
    <p>To remove the need to parse CBOR at all in many cases, <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getauthenticatordata" id="ref-for-dom-authenticatorattestationresponse-getauthenticatordata①">getAuthenticatorData()</a></code> returns the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①①">authenticator data</a> from <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-attestationobject" id="ref-for-dom-authenticatorattestationresponse-attestationobject⑥">attestationObject</a></code>. The <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①②">authenticator data</a> contains other fields that are encoded in a binary format. However, helper functions are not provided to access them because <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⑦">Relying Parties</a> already need to extract those fields when <a href="#sctn-getAssertion">getting an assertion</a>. In contrast to <a href="#sctn-createCredential">credential creation</a>, where signature verification is <a href="#enumdef-attestationconveyancepreference" id="ref-for-enumdef-attestationconveyancepreference">optional</a>, <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⑧">Relying Parties</a> should always be verifying signatures from an assertion and thus must extract fields from the signed <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①③">authenticator data</a>. The same functions used there will also serve during credential creation.</p>
    <p class="note" role="note"><span class="marker">Note:</span> <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickey" id="ref-for-dom-authenticatorattestationresponse-getpublickey⑥">getPublicKey()</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getauthenticatordata" id="ref-for-dom-authenticatorattestationresponse-getauthenticatordata②">getAuthenticatorData()</a></code> were only added in level two of this spec. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⑨">Relying Parties</a> SHOULD use feature detection before using these functions by testing the value of <code>'getPublicKey' in AuthenticatorAttestationResponse.prototype</code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②⓪">Relying Parties</a> that require this function to exist may not interoperate with older user-agents.</p>
    <h4 class="heading settled" data-level="5.2.2" id="iface-authenticatorassertionresponse"><span class="secno">5.2.2. </span><span class="content">Web Authentication Assertion (interface <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="authenticatorassertionresponse"><code>AuthenticatorAssertionResponse</code></dfn>)</span><a class="self-link" href="#iface-authenticatorassertionresponse"></a></h4>
@@ -3749,7 +3794,7 @@ <h4 class="heading settled" data-level="5.2.2" id="iface-authenticatorassertionr
    <h3 class="heading settled" data-level="5.3" id="dictionary-credential-params"><span class="secno">5.3. </span><span class="content">Parameters for Credential Generation (dictionary <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-publickeycredentialparameters"><code>PublicKeyCredentialParameters</code></dfn>)</span><a class="self-link" href="#dictionary-credential-params"></a></h3>
 <pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-publickeycredentialparameters" id="ref-for-dictdef-publickeycredentialparameters①"><c- g>PublicKeyCredentialParameters</c-></a> {
     <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⑦"><c- b>DOMString</c-></a>                    <a class="idl-code" data-link-type="dict-member" data-type="DOMString" href="#dom-publickeycredentialparameters-type" id="ref-for-dom-publickeycredentialparameters-type②"><c- g>type</c-></a>;
-    <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier⑥"><c- n>COSEAlgorithmIdentifier</c-></a>      <a class="idl-code" data-link-type="dict-member" data-type="COSEAlgorithmIdentifier" href="#dom-publickeycredentialparameters-alg" id="ref-for-dom-publickeycredentialparameters-alg①"><c- g>alg</c-></a>;
+    <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier⑦"><c- n>COSEAlgorithmIdentifier</c-></a>      <a class="idl-code" data-link-type="dict-member" data-type="COSEAlgorithmIdentifier" href="#dom-publickeycredentialparameters-alg" id="ref-for-dom-publickeycredentialparameters-alg①"><c- g>alg</c-></a>;
 };
 </pre>
    <div>
@@ -3758,7 +3803,7 @@ <h3 class="heading settled" data-level="5.3" id="dictionary-credential-params"><
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialParameters" data-dfn-type="dict-member" data-export id="dom-publickeycredentialparameters-type"><code>type</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⑧">DOMString</a></span>
      <dd data-md>
       <p>This member specifies the type of credential to be created. The value SHOULD be a member of <code class="idl"><a data-link-type="idl" href="#enumdef-publickeycredentialtype" id="ref-for-enumdef-publickeycredentialtype④">PublicKeyCredentialType</a></code> but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③①">client platforms</a> MUST ignore unknown values, ignoring any <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialparameters" id="ref-for-dictdef-publickeycredentialparameters②">PublicKeyCredentialParameters</a></code> with an unknown <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialparameters-type" id="ref-for-dom-publickeycredentialparameters-type③">type</a></code>.</p>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialParameters" data-dfn-type="dict-member" data-export id="dom-publickeycredentialparameters-alg"><code>alg</code></dfn>, <span> of type <a data-link-type="idl-name" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier⑦">COSEAlgorithmIdentifier</a></span>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialParameters" data-dfn-type="dict-member" data-export id="dom-publickeycredentialparameters-alg"><code>alg</code></dfn>, <span> of type <a data-link-type="idl-name" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier⑧">COSEAlgorithmIdentifier</a></span>
      <dd data-md>
       <p>This member specifies the cryptographic signature algorithm with which the newly generated credential will be used, and
 thus also the type of asymmetric key pair to be generated, e.g., RSA or Elliptic Curve.</p>
@@ -3768,7 +3813,7 @@ <h3 class="heading settled" data-level="5.3" id="dictionary-credential-params"><
    </div>
    <h3 class="heading settled" data-level="5.4" id="dictionary-makecredentialoptions"><span class="secno">5.4. </span><span class="content">Options for Credential Creation (dictionary <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-publickeycredentialcreationoptions"><code>PublicKeyCredentialCreationOptions</code></dfn>)</span><a class="self-link" href="#dictionary-makecredentialoptions"></a></h3>
 <pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions⑥"><c- g>PublicKeyCredentialCreationOptions</c-></a> {
-    <c- b>required</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity①"><c- n>PublicKeyCredentialRpEntity</c-></a>         <a class="idl-code" data-link-type="dict-member" data-type="PublicKeyCredentialRpEntity" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp⑧"><c- g>rp</c-></a>;
+    <c- b>required</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity①"><c- n>PublicKeyCredentialRpEntity</c-></a>         <a class="idl-code" data-link-type="dict-member" data-type="PublicKeyCredentialRpEntity" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp⑨"><c- g>rp</c-></a>;
     <c- b>required</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialuserentity" id="ref-for-dictdef-publickeycredentialuserentity"><c- n>PublicKeyCredentialUserEntity</c-></a>       <a class="idl-code" data-link-type="dict-member" data-type="PublicKeyCredentialUserEntity" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user③"><c- g>user</c-></a>;
 
     <c- b>required</c-> <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource②"><c- n>BufferSource</c-></a>                             <a class="idl-code" data-link-type="dict-member" data-type="BufferSource" href="#dom-publickeycredentialcreationoptions-challenge" id="ref-for-dom-publickeycredentialcreationoptions-challenge①"><c- g>challenge</c-></a>;
@@ -3790,14 +3835,14 @@ <h3 class="heading settled" data-level="5.4" id="dictionary-makecredentialoption
       <p>This member contains a name and an identifier for the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②①">Relying Party</a> responsible for the request.</p>
       <p>Its value’s <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name①">name</a></code> member is REQUIRED. See <a href="#dictionary-pkcredentialentity">§ 5.4.1 Public Key Entity Description (dictionary PublicKeyCredentialEntity)</a> for further
 details.</p>
-      <p>Its value’s <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id⑦">id</a></code> member specifies the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②②">RP ID</a> the credential
+      <p>Its value’s <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id⑧">id</a></code> member specifies the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②②">RP ID</a> the credential
 should be <a data-link-type="dfn" href="#scope" id="ref-for-scope①⓪">scoped</a> to. If omitted, its value will be the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#credentialscontainer" id="ref-for-credentialscontainer②">CredentialsContainer</a></code> object’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#relevant-settings-object" id="ref-for-relevant-settings-object②">relevant
 settings object</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-settings-object-origin" id="ref-for-concept-settings-object-origin⑥">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain①②">effective domain</a>. See <a href="#dictionary-rp-credential-params">§ 5.4.2 Relying Party Parameters for Credential Generation (dictionary PublicKeyCredentialRpEntity)</a> for further details.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-user"><code>user</code></dfn>, <span> of type <a data-link-type="idl-name" href="#dictdef-publickeycredentialuserentity" id="ref-for-dictdef-publickeycredentialuserentity①">PublicKeyCredentialUserEntity</a></span>
      <dd data-md>
       <p>This member contains names and an identifier for the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account①③">user account</a> performing the <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑦">registration</a>.</p>
       <p>Its value’s <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name②">name</a></code>, <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname②">displayName</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id②">id</a></code> members are REQUIRED. <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id③">id</a></code> can be returned as the <code class="idl"><a data-link-type="idl" href="#dom-authenticatorassertionresponse-userhandle" id="ref-for-dom-authenticatorassertionresponse-userhandle④">userHandle</a></code> in some future <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①③">authentication ceremonies</a>,
-and is used to overwrite existing <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential⑥">discoverable credentials</a> that have the same <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp⑨">rp</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id⑧">id</a></code></code> and <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user④">user</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id④">id</a></code></code> on the same <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑤">authenticator</a>. <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name③">name</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname③">displayName</a></code> MAY be used by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑥">authenticator</a> and <a data-link-type="dfn" href="#client" id="ref-for-client③⑥">client</a> in future <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①④">authentication ceremonies</a> to help the user select a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⓪">credential</a>, but are not returned to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②②">Relying Party</a> as a result of future <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①⑤">authentication ceremonies</a></p>
+and is used to overwrite existing <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential⑥">discoverable credentials</a> that have the same <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp①⓪">rp</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id⑨">id</a></code></code> and <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user④">user</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id④">id</a></code></code> on the same <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑤">authenticator</a>. <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name③">name</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname③">displayName</a></code> MAY be used by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑥">authenticator</a> and <a data-link-type="dfn" href="#client" id="ref-for-client③⑧">client</a> in future <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①④">authentication ceremonies</a> to help the user select a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⓪">credential</a>, but are not returned to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②②">Relying Party</a> as a result of future <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①⑤">authentication ceremonies</a></p>
       <p>For further details, see <a href="#dictionary-pkcredentialentity">§ 5.4.1 Public Key Entity Description (dictionary PublicKeyCredentialEntity)</a> and <a href="#dictionary-user-credential-params">§ 5.4.3 User Account Parameters for Credential Generation (dictionary PublicKeyCredentialUserEntity)</a>.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-challenge"><code>challenge</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource③">BufferSource</a></span>
      <dd data-md>
@@ -3808,9 +3853,9 @@ <h3 class="heading settled" data-level="5.4" id="dictionary-makecredentialoption
      <dd data-md>
       <p>This member lists the key types and signature algorithms the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②③">Relying Party</a> supports,
 ordered from most preferred to least preferred.
-The <a data-link-type="dfn" href="#client" id="ref-for-client③⑦">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑧">authenticator</a> make a best-effort to create a credential of the most preferred type possible.
+The <a data-link-type="dfn" href="#client" id="ref-for-client③⑨">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑧">authenticator</a> make a best-effort to create a credential of the most preferred type possible.
 If none of the listed types can be created, the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①⑥">create()</a></code> operation fails.</p>
-      <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②④">Relying Parties</a> that wish to support a wide range of <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑨">authenticators</a> SHOULD include at least the following <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier⑧">COSEAlgorithmIdentifier</a></code> values:</p>
+      <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②④">Relying Parties</a> that wish to support a wide range of <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑨">authenticators</a> SHOULD include at least the following <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier⑨">COSEAlgorithmIdentifier</a></code> values:</p>
       <ul>
        <li data-md>
         <p>-8 (Ed25519)</p>
@@ -3823,12 +3868,12 @@ <h3 class="heading settled" data-level="5.4" id="dictionary-makecredentialoption
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-timeout"><code>timeout</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long③">unsigned long</a></span>
      <dd data-md>
       <p>This OPTIONAL member specifies a time, in milliseconds, that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②⑤">Relying Party</a> is willing to wait for the call to complete. This is
-treated as a hint, and MAY be overridden by the <a data-link-type="dfn" href="#client" id="ref-for-client③⑧">client</a>.</p>
+treated as a hint, and MAY be overridden by the <a data-link-type="dfn" href="#client" id="ref-for-client④⓪">client</a>.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-excludecredentials"><code>excludeCredentials</code></dfn>, <span> of type sequence&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor⑥">PublicKeyCredentialDescriptor</a>>, defaulting to <code>[]</code></span>
      <dd data-md>
       <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②⑥">Relying Party</a> SHOULD use this OPTIONAL member to list any existing <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①①">credentials</a> mapped to this <a data-link-type="dfn" href="#user-account" id="ref-for-user-account①④">user account</a> (as identified by <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user⑤">user</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id⑤">id</a></code>).
 This ensures that the new credential is not <a data-link-type="dfn" href="#created-on" id="ref-for-created-on①">created on</a> an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⓪">authenticator</a> that already <a data-link-type="dfn" href="#contains" id="ref-for-contains①">contains</a> a credential mapped to this <a data-link-type="dfn" href="#user-account" id="ref-for-user-account①⑤">user account</a>.
-If it would be, the <a data-link-type="dfn" href="#client" id="ref-for-client③⑨">client</a> is requested to instead guide the user to use a different <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪①">authenticator</a>,
+If it would be, the <a data-link-type="dfn" href="#client" id="ref-for-client④①">client</a> is requested to instead guide the user to use a different <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪①">authenticator</a>,
 or return an error if that fails.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-authenticatorselection"><code>authenticatorSelection</code></dfn>, <span> of type <a data-link-type="idl-name" href="#dictdef-authenticatorselectioncriteria" id="ref-for-dictdef-authenticatorselectioncriteria②">AuthenticatorSelectionCriteria</a></span>
      <dd data-md>
@@ -3852,7 +3897,7 @@ <h3 class="heading settled" data-level="5.4" id="dictionary-makecredentialoption
       <p>The default value is the empty list, which indicates no preference.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-extensions"><code>extensions</code></dfn>, <span> of type <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientinputs" id="ref-for-dictdef-authenticationextensionsclientinputs①">AuthenticationExtensionsClientInputs</a></span>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⓪">Relying Party</a> MAY use this OPTIONAL member to provide <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input②">client extension inputs</a> requesting additional processing by the <a data-link-type="dfn" href="#client" id="ref-for-client④⓪">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⑤">authenticator</a>.
+      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⓪">Relying Party</a> MAY use this OPTIONAL member to provide <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input②">client extension inputs</a> requesting additional processing by the <a data-link-type="dfn" href="#client" id="ref-for-client④②">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⑤">authenticator</a>.
 For example, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③①">Relying Party</a> may request that the client returns additional information about the <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①②">credential</a> that was created.</p>
       <p>The extensions framework is defined in <a href="#sctn-extensions">§ 9 WebAuthn Extensions</a>.
 Some extensions are defined in <a href="#sctn-defined-extensions">§ 10 Defined Extensions</a>;
@@ -3883,13 +3928,13 @@ <h4 class="heading settled" data-level="5.4.1" id="dictionary-pkcredentialentity
          <li data-md>
           <p>This string MAY contain language and direction metadata. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③④">Relying Parties</a> SHOULD consider providing this information. See <a href="#sctn-strings-langdir">§ 6.4.2 Language and Direction Encoding</a> about how this metadata is encoded.</p>
          <li data-md>
-          <p><a data-link-type="dfn" href="#client" id="ref-for-client④①">Clients</a> SHOULD perform enforcement, as prescribed in Section 2.3 of <a data-link-type="biblio" href="#biblio-rfc8266" title="Preparation, Enforcement, and Comparison of Internationalized Strings Representing Nicknames">[RFC8266]</a> for the Nickname Profile of the PRECIS FreeformClass <a data-link-type="biblio" href="#biblio-rfc8264" title="PRECIS Framework: Preparation, Enforcement, and Comparison of Internationalized Strings in Application Protocols">[RFC8264]</a>,
+          <p><a data-link-type="dfn" href="#client" id="ref-for-client④③">Clients</a> SHOULD perform enforcement, as prescribed in Section 2.3 of <a data-link-type="biblio" href="#biblio-rfc8266" title="Preparation, Enforcement, and Comparison of Internationalized Strings Representing Nicknames">[RFC8266]</a> for the Nickname Profile of the PRECIS FreeformClass <a data-link-type="biblio" href="#biblio-rfc8264" title="PRECIS Framework: Preparation, Enforcement, and Comparison of Internationalized Strings in Application Protocols">[RFC8264]</a>,
 on <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name⑥">name</a></code>'s value prior to displaying the value to the user or
 including the value as a parameter of the <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential⑦">authenticatorMakeCredential</a> operation.</p>
         </ul>
        <li data-md>
         <p>When inherited by <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialuserentity" id="ref-for-dictdef-publickeycredentialuserentity②">PublicKeyCredentialUserEntity</a></code>, it is a <a data-link-type="dfn" href="#human-palatability" id="ref-for-human-palatability④">human-palatable</a> identifier for a <a data-link-type="dfn" href="#user-account" id="ref-for-user-account①⑦">user account</a>. This
-identifier is the primary value displayed to users by <a data-link-type="dfn" href="#client" id="ref-for-client④②">Clients</a> to help users
+identifier is the primary value displayed to users by <a data-link-type="dfn" href="#client" id="ref-for-client④④">Clients</a> to help users
 understand with which <a data-link-type="dfn" href="#user-account" id="ref-for-user-account①⑧">user account</a> a credential is associated.</p>
         <p>Examples of suitable values for this identifier include, "alexm", "+14255551234",
 "alex.mueller@example.com", "alex.mueller@example.com (prod-env)",
@@ -3903,12 +3948,12 @@ <h4 class="heading settled" data-level="5.4.1" id="dictionary-pkcredentialentity
          <li data-md>
           <p>This string MAY contain language and direction metadata. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⑦">Relying Parties</a> SHOULD consider providing this information. See <a href="#sctn-strings-langdir">§ 6.4.2 Language and Direction Encoding</a> about how this metadata is encoded.</p>
          <li data-md>
-          <p><a data-link-type="dfn" href="#client" id="ref-for-client④③">Clients</a> SHOULD perform enforcement, as prescribed in Section 3.4.3 of <a data-link-type="biblio" href="#biblio-rfc8265" title="Preparation, Enforcement, and Comparison of Internationalized Strings Representing Usernames and Passwords">[RFC8265]</a> for the UsernameCasePreserved Profile of the PRECIS IdentifierClass <a data-link-type="biblio" href="#biblio-rfc8264" title="PRECIS Framework: Preparation, Enforcement, and Comparison of Internationalized Strings in Application Protocols">[RFC8264]</a>,
+          <p><a data-link-type="dfn" href="#client" id="ref-for-client④⑤">Clients</a> SHOULD perform enforcement, as prescribed in Section 3.4.3 of <a data-link-type="biblio" href="#biblio-rfc8265" title="Preparation, Enforcement, and Comparison of Internationalized Strings Representing Usernames and Passwords">[RFC8265]</a> for the UsernameCasePreserved Profile of the PRECIS IdentifierClass <a data-link-type="biblio" href="#biblio-rfc8264" title="PRECIS Framework: Preparation, Enforcement, and Comparison of Internationalized Strings in Application Protocols">[RFC8264]</a>,
 on <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name⑧">name</a></code>'s value prior to displaying the value to the user or
 including the value as a parameter of the <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential⑧">authenticatorMakeCredential</a> operation.</p>
         </ul>
       </ul>
-      <p>When <a data-link-type="dfn" href="#client" id="ref-for-client④④">clients</a>, <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③③">client platforms</a>, or <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⑥">authenticators</a> display a <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name⑨">name</a></code>'s value, they should always use UI elements to provide a clear boundary around the displayed value, and not allow overflow into other elements <a data-link-type="biblio" href="#biblio-css-overflow-3" title="CSS Overflow Module Level 3">[css-overflow-3]</a>.</p>
+      <p>When <a data-link-type="dfn" href="#client" id="ref-for-client④⑥">clients</a>, <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③③">client platforms</a>, or <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⑥">authenticators</a> display a <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name⑨">name</a></code>'s value, they should always use UI elements to provide a clear boundary around the displayed value, and not allow overflow into other elements <a data-link-type="biblio" href="#biblio-css-overflow-3" title="CSS Overflow Module Level 3">[css-overflow-3]</a>.</p>
       <p>When storing a <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name①⓪">name</a></code> member’s value,
 the value MAY be truncated as described in <a href="#sctn-strings-truncation">§ 6.4.1 String Truncation</a> using a size limit greater than or equal to 64 bytes.</p>
     </dl>
@@ -3916,7 +3961,7 @@ <h4 class="heading settled" data-level="5.4.1" id="dictionary-pkcredentialentity
    <h4 class="heading settled" data-level="5.4.2" id="dictionary-rp-credential-params"><span class="secno">5.4.2. </span><span class="content">Relying Party Parameters for Credential Generation (dictionary <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-publickeycredentialrpentity"><code>PublicKeyCredentialRpEntity</code></dfn>)</span><a class="self-link" href="#dictionary-rp-credential-params"></a></h4>
    <p>The <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity④">PublicKeyCredentialRpEntity</a></code> dictionary is used to supply additional <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⑧">Relying Party</a> attributes when creating a new credential.</p>
 <pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity⑤"><c- g>PublicKeyCredentialRpEntity</c-></a> : <a data-link-type="idl-name" href="#dictdef-publickeycredentialentity" id="ref-for-dictdef-publickeycredentialentity③"><c- n>PublicKeyCredentialEntity</c-></a> {
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③⑦"><c- b>DOMString</c-></a>      <a class="idl-code" data-link-type="dict-member" data-type="DOMString" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id⑨"><c- g>id</c-></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③⑦"><c- b>DOMString</c-></a>      <a class="idl-code" data-link-type="dict-member" data-type="DOMString" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id①⓪"><c- g>id</c-></a>;
 };
 </pre>
    <div>
@@ -3963,11 +4008,11 @@ <h4 class="heading settled" data-level="5.4.3" id="dictionary-user-credential-pa
        <li data-md>
         <p>This string MAY contain language and direction metadata. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④④">Relying Parties</a> SHOULD consider providing this information. See <a href="#sctn-strings-langdir">§ 6.4.2 Language and Direction Encoding</a> about how this metadata is encoded.</p>
        <li data-md>
-        <p><a data-link-type="dfn" href="#client" id="ref-for-client④⑤">Clients</a> SHOULD perform enforcement, as prescribed in Section 2.3 of <a data-link-type="biblio" href="#biblio-rfc8266" title="Preparation, Enforcement, and Comparison of Internationalized Strings Representing Nicknames">[RFC8266]</a> for the Nickname Profile of the PRECIS FreeformClass <a data-link-type="biblio" href="#biblio-rfc8264" title="PRECIS Framework: Preparation, Enforcement, and Comparison of Internationalized Strings in Application Protocols">[RFC8264]</a>,
+        <p><a data-link-type="dfn" href="#client" id="ref-for-client④⑦">Clients</a> SHOULD perform enforcement, as prescribed in Section 2.3 of <a data-link-type="biblio" href="#biblio-rfc8266" title="Preparation, Enforcement, and Comparison of Internationalized Strings Representing Nicknames">[RFC8266]</a> for the Nickname Profile of the PRECIS FreeformClass <a data-link-type="biblio" href="#biblio-rfc8264" title="PRECIS Framework: Preparation, Enforcement, and Comparison of Internationalized Strings in Application Protocols">[RFC8264]</a>,
 on <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname⑦">displayName</a></code>'s value prior to displaying the value to the user or
 including the value as a parameter of the <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential⑨">authenticatorMakeCredential</a> operation.</p>
       </ul>
-      <p>When <a data-link-type="dfn" href="#client" id="ref-for-client④⑥">clients</a>, <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③④">client platforms</a>, or <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⑦">authenticators</a> display a <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname⑧">displayName</a></code>'s value, they should always use UI elements to provide a clear boundary around the displayed value, and not allow overflow into other elements <a data-link-type="biblio" href="#biblio-css-overflow-3" title="CSS Overflow Module Level 3">[css-overflow-3]</a>.</p>
+      <p>When <a data-link-type="dfn" href="#client" id="ref-for-client④⑧">clients</a>, <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③④">client platforms</a>, or <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⑦">authenticators</a> display a <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname⑧">displayName</a></code>'s value, they should always use UI elements to provide a clear boundary around the displayed value, and not allow overflow into other elements <a data-link-type="biblio" href="#biblio-css-overflow-3" title="CSS Overflow Module Level 3">[css-overflow-3]</a>.</p>
       <p>When storing a <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname⑨">displayName</a></code> member’s value,
 the value MAY be truncated as described in <a href="#sctn-strings-truncation">§ 6.4.1 String Truncation</a> using a size limit greater than or equal to 64 bytes.</p>
     </dl>
@@ -4008,7 +4053,7 @@ <h4 class="heading settled" data-level="5.4.4" id="dictionary-authenticatorSelec
     </dl>
    </div>
    <h4 class="heading settled" data-level="5.4.5" id="enum-attachment"><span class="secno">5.4.5. </span><span class="content">Authenticator Attachment Enumeration (enum <dfn class="dfn-paneled idl-code" data-dfn-type="enum" data-export id="enumdef-authenticatorattachment"><code>AuthenticatorAttachment</code></dfn>)</span><a class="self-link" href="#enum-attachment"></a></h4>
-   <p>This enumeration’s values describe <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⑨">authenticators</a>' <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality⑥">attachment modalities</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④⑧">Relying Parties</a> use this to express a preferred <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality⑦">authenticator attachment modality</a> when calling <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⓪">navigator.credentials.create()</a></code> to <a href="#sctn-createCredential">create a credential</a>, and <a data-link-type="dfn" href="#client" id="ref-for-client④⑦">clients</a> use this to report the <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality⑧">authenticator attachment modality</a> used to complete a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑥">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①⑥">authentication ceremony</a>.</p>
+   <p>This enumeration’s values describe <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⑨">authenticators</a>' <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality⑥">attachment modalities</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④⑧">Relying Parties</a> use this to express a preferred <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality⑦">authenticator attachment modality</a> when calling <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⓪">navigator.credentials.create()</a></code> to <a href="#sctn-createCredential">create a credential</a>, and <a data-link-type="dfn" href="#client" id="ref-for-client④⑨">clients</a> use this to report the <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality⑧">authenticator attachment modality</a> used to complete a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑥">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①⑥">authentication ceremony</a>.</p>
 <pre class="idl highlight def"><c- b>enum</c-> <a class="idl-code" data-link-type="enum" href="#enumdef-authenticatorattachment" id="ref-for-enumdef-authenticatorattachment④"><c- g>AuthenticatorAttachment</c-></a> {
     <a class="idl-code" data-link-type="enum-value" href="#dom-authenticatorattachment-platform" id="ref-for-dom-authenticatorattachment-platform"><c- s>"platform"</c-></a>,
     <a class="idl-code" data-link-type="enum-value" href="#dom-authenticatorattachment-cross-platform" id="ref-for-dom-authenticatorattachment-cross-platform"><c- s>"cross-platform"</c-></a>
@@ -4028,7 +4073,7 @@ <h4 class="heading settled" data-level="5.4.5" id="enum-attachment"><span class=
    <p class="note" role="note"><span class="marker">Note:</span> An <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality⑨">authenticator attachment modality</a> selection option is available only in the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-create-slot" id="ref-for-dom-publickeycredential-create-slot③">[[Create]](origin, options,
 sameOriginWithAncestors)</a></code> operation. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④⑨">Relying Party</a> may use it to, for example, ensure the user has a <a data-link-type="dfn" href="#roaming-credential" id="ref-for-roaming-credential">roaming credential</a> for
 authenticating on another <a data-link-type="dfn" href="#client-device" id="ref-for-client-device①⑥">client device</a>; or to specifically register a <a data-link-type="dfn" href="#platform-credential" id="ref-for-platform-credential">platform credential</a> for easier reauthentication using a
-particular <a data-link-type="dfn" href="#client-device" id="ref-for-client-device①⑦">client device</a>. The <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-slot" id="ref-for-dom-publickeycredential-discoverfromexternalsource-slot⑤">[[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors)</a></code> operation has no <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality①⓪">authenticator attachment modality</a> selection option, so the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⓪">Relying Party</a> SHOULD accept any of the user’s registered <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③③">credentials</a>. The <a data-link-type="dfn" href="#client" id="ref-for-client④⑧">client</a> and user will then use whichever is available and convenient at the time.</p>
+particular <a data-link-type="dfn" href="#client-device" id="ref-for-client-device①⑦">client device</a>. The <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-slot" id="ref-for-dom-publickeycredential-discoverfromexternalsource-slot⑤">[[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors)</a></code> operation has no <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality①⓪">authenticator attachment modality</a> selection option, so the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⓪">Relying Party</a> SHOULD accept any of the user’s registered <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③③">credentials</a>. The <a data-link-type="dfn" href="#client" id="ref-for-client⑤⓪">client</a> and user will then use whichever is available and convenient at the time.</p>
    <h4 class="heading settled" data-level="5.4.6" id="enum-residentKeyRequirement"><span class="secno">5.4.6. </span><span class="content">Resident Key Requirement Enumeration (enum <dfn class="dfn-paneled idl-code" data-dfn-type="enum" data-export id="enumdef-residentkeyrequirement"><code>ResidentKeyRequirement</code></dfn>)</span><a class="self-link" href="#enum-residentKeyRequirement"></a></h4>
 <pre class="idl highlight def"><c- b>enum</c-> <a class="idl-code" data-link-type="enum" href="#enumdef-residentkeyrequirement" id="ref-for-enumdef-residentkeyrequirement②"><c- g>ResidentKeyRequirement</c-></a> {
     <a class="idl-code" data-link-type="enum-value" href="#dom-residentkeyrequirement-discouraged" id="ref-for-dom-residentkeyrequirement-discouraged③"><c- s>"discouraged"</c-></a>,
@@ -4043,17 +4088,17 @@ <h4 class="heading settled" data-level="5.4.6" id="enum-residentKeyRequirement">
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ResidentKeyRequirement" data-dfn-type="enum-value" data-export data-lt="&quot;discouraged&quot;|discouraged" id="dom-residentkeyrequirement-discouraged"><code>discouraged</code></dfn>
      <dd data-md>
       <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤②">Relying Party</a> prefers creating a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential⑥">server-side credential</a>, but will accept a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential⑧">client-side discoverable credential</a>.
-The <a data-link-type="dfn" href="#client" id="ref-for-client④⑨">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①⓪">authenticator</a> SHOULD create a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential⑦">server-side credential</a> if possible.</p>
+The <a data-link-type="dfn" href="#client" id="ref-for-client⑤①">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①⓪">authenticator</a> SHOULD create a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential⑦">server-side credential</a> if possible.</p>
       <p class="note" role="note"><span class="marker">Note:</span> A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤③">Relying Party</a> cannot require that a created credential is a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential⑧">server-side credential</a> and the <a data-link-type="dfn" href="#credprops" id="ref-for-credprops②">Credential Properties Extension</a> may not return a value for the <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk">rk</a></code> property. Because of this, it may be the case that it does not know if a credential is a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential⑨">server-side credential</a> or not and thus does not know whether creating a second credential with the same <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②⓪">user handle</a> will evict the first.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ResidentKeyRequirement" data-dfn-type="enum-value" data-export data-lt="&quot;preferred&quot;|preferred" id="dom-residentkeyrequirement-preferred"><code>preferred</code></dfn>
      <dd data-md>
       <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤④">Relying Party</a> strongly prefers creating a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential⑨">client-side discoverable credential</a>, but will accept a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential①⓪">server-side credential</a>.
-The <a data-link-type="dfn" href="#client" id="ref-for-client⑤⓪">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①①">authenticator</a> SHOULD create a <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential⑨">discoverable credential</a> if possible.
-For example, the <a data-link-type="dfn" href="#client" id="ref-for-client⑤①">client</a> SHOULD guide the user through setting up <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②③">user verification</a> if needed to create a <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①⓪">discoverable credential</a>. This takes precedence over the setting of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-userverification" id="ref-for-dom-authenticatorselectioncriteria-userverification④">userVerification</a></code>.</p>
+The <a data-link-type="dfn" href="#client" id="ref-for-client⑤②">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①①">authenticator</a> SHOULD create a <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential⑨">discoverable credential</a> if possible.
+For example, the <a data-link-type="dfn" href="#client" id="ref-for-client⑤③">client</a> SHOULD guide the user through setting up <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②③">user verification</a> if needed to create a <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①⓪">discoverable credential</a>. This takes precedence over the setting of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-userverification" id="ref-for-dom-authenticatorselectioncriteria-userverification④">userVerification</a></code>.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ResidentKeyRequirement" data-dfn-type="enum-value" data-export data-lt="&quot;required&quot;|required" id="dom-residentkeyrequirement-required"><code>required</code></dfn>
      <dd data-md>
       <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⑤">Relying Party</a> requires a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①⓪">client-side discoverable credential</a>.
-The <a data-link-type="dfn" href="#client" id="ref-for-client⑤②">client</a> MUST return an error if a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①①">client-side discoverable credential</a> cannot be created.</p>
+The <a data-link-type="dfn" href="#client" id="ref-for-client⑤④">client</a> MUST return an error if a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①①">client-side discoverable credential</a> cannot be created.</p>
     </dl>
    </div>
    <p class="note" role="note"><span class="marker">Note:</span> The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⑥">Relying Party</a> can seek information on whether or not the authenticator created a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①②">client-side discoverable credential</a> using the <a data-link-type="dfn" href="#credentialpropertiesoutput-resident-key-credential-property" id="ref-for-credentialpropertiesoutput-resident-key-credential-property">resident key credential property</a> of the <a data-link-type="dfn" href="#credprops" id="ref-for-credprops③">Credential Properties Extension</a>.
@@ -4076,16 +4121,16 @@ <h4 class="heading settled" data-level="5.4.7" id="enum-attestation-convey"><spa
 potentially avoid having to obtain <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent①②">user consent</a> to relay identifying information to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⑧">Relying Party</a>, or to save a
 roundtrip to an <a data-link-type="dfn" href="#attestation-ca" id="ref-for-attestation-ca">Attestation CA</a> or <a data-link-type="dfn" href="#anonymization-ca" id="ref-for-anonymization-ca①">Anonymization CA</a>.
 If the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①④">authenticator</a> generates an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑨">attestation statement</a> that is not a <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation⑤">self attestation</a>,
-the <a data-link-type="dfn" href="#client" id="ref-for-client⑤③">client</a> will replace it with a <a data-link-type="dfn" href="#none" id="ref-for-none">None</a> attestation statement.</p>
+the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑤">client</a> will replace it with a <a data-link-type="dfn" href="#none" id="ref-for-none">None</a> attestation statement.</p>
       <p>This is the default, and unknown values fall back to the behavior of this value.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AttestationConveyancePreference" data-dfn-type="enum-value" data-export data-lt="&quot;indirect&quot;|indirect" id="dom-attestationconveyancepreference-indirect"><code>indirect</code></dfn>
      <dd data-md>
       <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⑨">Relying Party</a> wants to receive a verifiable <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⓪">attestation statement</a>,
-but allows the <a data-link-type="dfn" href="#client" id="ref-for-client⑤④">client</a> to decide how to obtain such an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①①">attestation statement</a>.
+but allows the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑥">client</a> to decide how to obtain such an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①①">attestation statement</a>.
 The client MAY replace an authenticator-generated <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①②">attestation statement</a> with one generated by an <a data-link-type="dfn" href="#anonymization-ca" id="ref-for-anonymization-ca②">Anonymization CA</a>,
 in order to protect the user’s privacy, or to assist <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⓪">Relying Parties</a> with attestation verification in a heterogeneous ecosystem.</p>
       <p class="note" role="note"><span class="marker">Note:</span> There is no guarantee that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥①">Relying Party</a> will obtain a verifiable <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①③">attestation statement</a> in this case.
-For example, in the case that the authenticator employs <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation⑥">self attestation</a> and the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑤">client</a> passes the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①④">attestation statement</a> through unmodified.</p>
+For example, in the case that the authenticator employs <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation⑥">self attestation</a> and the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑦">client</a> passes the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①④">attestation statement</a> through unmodified.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AttestationConveyancePreference" data-dfn-type="enum-value" data-export data-lt="&quot;direct&quot;|direct" id="dom-attestationconveyancepreference-direct"><code>direct</code></dfn>
      <dd data-md>
       <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥②">Relying Party</a> wants to receive the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⑤">attestation statement</a> as generated by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①⑤">authenticator</a>.</p>
@@ -4101,7 +4146,7 @@ <h3 class="heading settled" data-level="5.5" id="dictionary-assertion-options"><
 <pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions⑨"><c- g>PublicKeyCredentialRequestOptions</c-></a> {
     <c- b>required</c-> <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource⑥"><c- n>BufferSource</c-></a>                <a class="idl-code" data-link-type="dict-member" data-type="BufferSource" href="#dom-publickeycredentialrequestoptions-challenge" id="ref-for-dom-publickeycredentialrequestoptions-challenge②"><c- g>challenge</c-></a>;
     <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long④"><c- b>unsigned</c-> <c- b>long</c-></a>                        <a class="idl-code" data-link-type="dict-member" data-type="unsigned long" href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout③"><c- g>timeout</c-></a>;
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-USVString" id="ref-for-idl-USVString"><c- b>USVString</c-></a>                            <a class="idl-code" data-link-type="dict-member" data-type="USVString" href="#dom-publickeycredentialrequestoptions-rpid" id="ref-for-dom-publickeycredentialrequestoptions-rpid④"><c- g>rpId</c-></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-USVString" id="ref-for-idl-USVString"><c- b>USVString</c-></a>                            <a class="idl-code" data-link-type="dict-member" data-type="USVString" href="#dom-publickeycredentialrequestoptions-rpid" id="ref-for-dom-publickeycredentialrequestoptions-rpid⑤"><c- g>rpId</c-></a>;
     <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence①③"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor⑦"><c- n>PublicKeyCredentialDescriptor</c-></a>> <a class="idl-code" data-default="[]" data-link-type="dict-member" data-type="sequence<PublicKeyCredentialDescriptor>" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials①⑤"><c- g>allowCredentials</c-></a> = [];
     <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString④⑦"><c- b>DOMString</c-></a>                            <a class="idl-code" data-default="&quot;preferred&quot;" data-link-type="dict-member" data-type="DOMString" href="#dom-publickeycredentialrequestoptions-userverification" id="ref-for-dom-publickeycredentialrequestoptions-userverification②"><c- g>userVerification</c-></a> = "preferred";
     <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence①④"><c- b>sequence</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString④⑧"><c- b>DOMString</c-></a>>                  <a class="idl-code" data-default="[]" data-link-type="dict-member" data-type="sequence<DOMString>" href="#dom-publickeycredentialrequestoptions-hints" id="ref-for-dom-publickeycredentialrequestoptions-hints①"><c- g>hints</c-></a> = [];
@@ -4115,18 +4160,18 @@ <h3 class="heading settled" data-level="5.5" id="dictionary-assertion-options"><
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialRequestOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialrequestoptions-timeout"><code>timeout</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤">unsigned long</a></span>
     <dd data-md>
      <p>This OPTIONAL member specifies a time, in milliseconds, that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑤">Relying Party</a> is willing to wait for the call to complete.
-The value is treated as a hint, and MAY be overridden by the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑥">client</a>.</p>
+The value is treated as a hint, and MAY be overridden by the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑧">client</a>.</p>
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialRequestOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialrequestoptions-rpid"><code>rpId</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-USVString" id="ref-for-idl-USVString①">USVString</a></span>
     <dd data-md>
      <p>This OPTIONAL member specifies the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⑤">RP ID</a> claimed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑥">Relying Party</a>.
-The <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑦">client</a> MUST verify that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑦">Relying Party</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①①">origin</a> matches the <a data-link-type="dfn" href="#scope" id="ref-for-scope①②">scope</a> of this <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⑥">RP ID</a>.
+The <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑨">client</a> MUST verify that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑦">Relying Party</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①①">origin</a> matches the <a data-link-type="dfn" href="#scope" id="ref-for-scope①②">scope</a> of this <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⑥">RP ID</a>.
 The <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①⑦">authenticator</a> MUST verify
 that this <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⑦">RP ID</a> exactly equals the <a data-link-type="dfn" href="#public-key-credential-source-rpid" id="ref-for-public-key-credential-source-rpid">rpId</a> of the <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①③">credential</a> to be used for the <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①⑦">authentication ceremony</a>.</p>
      <p>If not specified, its value will
 be the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#credentialscontainer" id="ref-for-credentialscontainer③">CredentialsContainer</a></code> object’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#relevant-settings-object" id="ref-for-relevant-settings-object③">relevant settings object</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-settings-object-origin" id="ref-for-concept-settings-object-origin⑦">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain①③">effective domain</a>.</p>
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialRequestOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialrequestoptions-allowcredentials"><code>allowCredentials</code></dfn>, <span> of type sequence&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor⑧">PublicKeyCredentialDescriptor</a>>, defaulting to <code>[]</code></span>
     <dd data-md>
-     <p>This OPTIONAL member is used by the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑧">client</a> to find <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①⑧">authenticators</a> eligible for this <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①⑧">authentication ceremony</a>.
+     <p>This OPTIONAL member is used by the <a data-link-type="dfn" href="#client" id="ref-for-client⑥⓪">client</a> to find <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①⑧">authenticators</a> eligible for this <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①⑧">authentication ceremony</a>.
 It can be used in two ways:</p>
      <ul>
       <li data-md>
@@ -4134,9 +4179,9 @@ <h3 class="heading settled" data-level="5.5" id="dictionary-assertion-options"><
 then the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑧">Relying Party</a> SHOULD use this member to list <a data-link-type="dfn" href="#credential-descriptor-for-a-credential-record" id="ref-for-credential-descriptor-for-a-credential-record">credential descriptors for credential records</a> in the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②⑤">user account</a>.
 This SHOULD usually include all <a data-link-type="dfn" href="#credential-record" id="ref-for-credential-record⑥">credential records</a> in the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②⑥">user account</a>.</p>
        <p>The <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item⑧">items</a> SHOULD specify <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports⑨">transports</a></code> whenever possible.
-This helps the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑨">client</a> optimize the user experience for any given situation.
+This helps the <a data-link-type="dfn" href="#client" id="ref-for-client⑥①">client</a> optimize the user experience for any given situation.
 Also note that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑨">Relying Party</a> does not need to filter the list when requesting <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②④">user verification</a> —
-the <a data-link-type="dfn" href="#client" id="ref-for-client⑥⓪">client</a> will automatically ignore non-eligible credentials
+the <a data-link-type="dfn" href="#client" id="ref-for-client⑥②">client</a> will automatically ignore non-eligible credentials
 if <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-userverification" id="ref-for-dom-publickeycredentialrequestoptions-userverification③">userVerification</a></code> is set to <code class="idl"><a data-link-type="idl" href="#dom-userverificationrequirement-required" id="ref-for-dom-userverificationrequirement-required④">required</a></code>.</p>
        <p>See also the <a href="#sctn-credential-id-privacy-leak">§ 14.6.3 Privacy leak via credential IDs</a> privacy consideration.</p>
       <li data-md>
@@ -4159,7 +4204,7 @@ <h3 class="heading settled" data-level="5.5" id="dictionary-assertion-options"><
      <p>This OPTIONAL member contains zero or more elements from <code class="idl"><a data-link-type="idl" href="#enumdef-publickeycredentialhints" id="ref-for-enumdef-publickeycredentialhints①">PublicKeyCredentialHints</a></code> to guide the user agent in interacting with the user. Note that the elements have type <code>DOMString</code> despite being taken from that enumeration. See <a href="#sct-domstring-backwards-compatibility">§ 2.1.1 Enumerations as DOMString types</a>.</p>
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialRequestOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialrequestoptions-extensions"><code>extensions</code></dfn>, <span> of type <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientinputs" id="ref-for-dictdef-authenticationextensionsclientinputs③">AuthenticationExtensionsClientInputs</a></span>
     <dd data-md>
-     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦③">Relying Party</a> MAY use this OPTIONAL member to provide <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input③">client extension inputs</a> requesting additional processing by the <a data-link-type="dfn" href="#client" id="ref-for-client⑥①">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①②①">authenticator</a>.</p>
+     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦③">Relying Party</a> MAY use this OPTIONAL member to provide <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input③">client extension inputs</a> requesting additional processing by the <a data-link-type="dfn" href="#client" id="ref-for-client⑥③">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①②①">authenticator</a>.</p>
      <p>The extensions framework is defined in <a href="#sctn-extensions">§ 9 WebAuthn Extensions</a>.
 Some extensions are defined in <a href="#sctn-defined-extensions">§ 10 Defined Extensions</a>;
 consult the IANA "WebAuthn Extension Identifiers" registry <a data-link-type="biblio" href="#biblio-iana-webauthn-registries" title="Web Authentication (WebAuthn) registries">[IANA-WebAuthn-Registries]</a> established by <a data-link-type="biblio" href="#biblio-rfc8809" title="Registries for Web Authentication (WebAuthn)">[RFC8809]</a> for an up-to-date list
@@ -4201,7 +4246,7 @@ <h4 class="heading settled" data-level="5.7.3" id="iface-authentication-extensio
    <p>The <a data-link-type="dfn" href="#cddl" id="ref-for-cddl">CDDL</a> type <code>AuthenticationExtensionsAuthenticatorInputs</code> defines a <a data-link-type="dfn" href="#cbor" id="ref-for-cbor⑤">CBOR</a> map
 containing the <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input">authenticator extension input</a> values for zero or more <a data-link-type="dfn" href="#webauthn-extensions" id="ref-for-webauthn-extensions⑥">WebAuthn Extensions</a>.
 Extensions can add members as described in <a href="#sctn-extension-request-parameters">§ 9.3 Extending Request Parameters</a>.</p>
-   <p>This type is not exposed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦④">Relying Party</a>, but is used by the <a data-link-type="dfn" href="#client" id="ref-for-client⑥②">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①②②">authenticator</a>.</p>
+   <p>This type is not exposed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦④">Relying Party</a>, but is used by the <a data-link-type="dfn" href="#client" id="ref-for-client⑥④">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①②②">authenticator</a>.</p>
    <h4 class="heading settled" data-level="5.7.4" id="iface-authentication-extensions-authenticator-outputs"><span class="secno">5.7.4. </span><span class="content">Authentication Extensions Authenticator Outputs (CDDL type <code>AuthenticationExtensionsAuthenticatorOutputs</code>)</span><a class="self-link" href="#iface-authentication-extensions-authenticator-outputs"></a></h4>
 <pre>AuthenticationExtensionsAuthenticatorOutputs = {
   * $$extensionOutput .within ( tstr => any )
@@ -4214,7 +4259,7 @@ <h3 class="heading settled" data-level="5.8" id="sctn-supporting-data-structures
    <p>The <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③④">public key credential</a> type uses certain data structures that are specified in supporting specifications. These are as
 follows.</p>
    <h4 class="heading settled" data-level="5.8.1" id="dictionary-client-data"><span class="secno">5.8.1. </span><span class="content">Client Data Used in <a data-link-type="dfn" href="#webauthn-signature" id="ref-for-webauthn-signature">WebAuthn Signatures</a> (dictionary <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-collectedclientdata"><code>CollectedClientData</code></dfn>)</span><a class="self-link" href="#dictionary-client-data"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="client-data">client data</dfn> represents the contextual bindings of both the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②②">WebAuthn Relying Party</a> and the <a data-link-type="dfn" href="#client" id="ref-for-client⑥③">client</a>. It is a key-value
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="client-data">client data</dfn> represents the contextual bindings of both the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②②">WebAuthn Relying Party</a> and the <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑤">client</a>. It is a key-value
 mapping whose keys are strings. Values can be any type that has a valid encoding in JSON. Its structure is defined by the
 following Web IDL.</p>
    <p class="note" role="note"><span class="marker">Note:</span> The <code class="idl"><a data-link-type="idl" href="#dictdef-collectedclientdata" id="ref-for-dictdef-collectedclientdata②">CollectedClientData</a></code> may be extended in the future. Therefore it’s critical when parsing to be tolerant of unknown keys and of any reordering of the keys. See also <a href="#clientdatajson-verification">§ 5.8.1.2 Limited Verification Algorithm</a>.</p>
@@ -4476,7 +4521,7 @@ <h4 class="heading settled" data-level="5.8.3" id="dictionary-credential-descrip
 </pre>
    <p>This dictionary identifies a specific <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③⑤">public key credential</a>.
 It is used in <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②①">create()</a></code> to prevent creating duplicate credentials on the same <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①②③">authenticator</a>,
-and in <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⑥">get()</a></code> to determine if and how the credential can currently be reached by the <a data-link-type="dfn" href="#client" id="ref-for-client⑥④">client</a>.</p>
+and in <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⑥">get()</a></code> to determine if and how the credential can currently be reached by the <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑥">client</a>.</p>
    <p>The <a data-link-type="dfn" href="#credential-descriptor-for-a-credential-record" id="ref-for-credential-descriptor-for-a-credential-record①">credential descriptor for a credential record</a> is a subset of the properties of that <a data-link-type="dfn" href="#credential-record" id="ref-for-credential-record⑦">credential record</a>,
 and mirrors some fields of the <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②②">PublicKeyCredential</a></code> object returned by <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②②">create()</a></code> and <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⑦">get()</a></code>.</p>
    <div>
@@ -4494,7 +4539,7 @@ <h4 class="heading settled" data-level="5.8.3" id="dictionary-credential-descrip
 This mirrors the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-rawid" id="ref-for-dom-publickeycredential-rawid①">rawId</a></code> field of <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②④">PublicKeyCredential</a></code>.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialDescriptor" data-dfn-type="dict-member" data-export id="dom-publickeycredentialdescriptor-transports"><code>transports</code></dfn>, <span> of type sequence&lt;<a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑥⑥">DOMString</a>></span>
      <dd data-md>
-      <p>This OPTIONAL member contains a hint as to how the <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑤">client</a> might communicate with the <a data-link-type="dfn" href="#public-key-credential-source-managing-authenticator" id="ref-for-public-key-credential-source-managing-authenticator①①">managing authenticator</a> of the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③⑧">public key credential</a> the caller is referring to. The values SHOULD be members of <code class="idl"><a data-link-type="idl" href="#enumdef-authenticatortransport" id="ref-for-enumdef-authenticatortransport②">AuthenticatorTransport</a></code> but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④③">client platforms</a> MUST ignore unknown values.</p>
+      <p>This OPTIONAL member contains a hint as to how the <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑦">client</a> might communicate with the <a data-link-type="dfn" href="#public-key-credential-source-managing-authenticator" id="ref-for-public-key-credential-source-managing-authenticator①①">managing authenticator</a> of the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③⑧">public key credential</a> the caller is referring to. The values SHOULD be members of <code class="idl"><a data-link-type="idl" href="#enumdef-authenticatortransport" id="ref-for-enumdef-authenticatortransport②">AuthenticatorTransport</a></code> but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④③">client platforms</a> MUST ignore unknown values.</p>
       <p>This SHOULD be set to the value of the <a data-link-type="abstract-op" href="#abstract-opdef-credential-record-transports" id="ref-for-abstract-opdef-credential-record-transports①">transports</a> item of the <a data-link-type="dfn" href="#credential-record" id="ref-for-credential-record①⓪">credential record</a> representing the identified <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source④⑧">public key credential source</a>.
 This mirrors the <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-response" id="ref-for-dom-publickeycredential-response④">response</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports④">getTransports()</a></code></code> method
 of the <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②⑤">PublicKeyCredential</a></code> structure created by a <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②③">create()</a></code> operation.</p>
@@ -4512,7 +4557,7 @@ <h4 class="heading settled" data-level="5.8.4" id="enum-transport"><span class="
 </pre>
    <p class="note" role="note"><span class="marker">Note:</span> The <code class="idl"><a data-link-type="idl" href="#enumdef-authenticatortransport" id="ref-for-enumdef-authenticatortransport④">AuthenticatorTransport</a></code> enumeration is deliberately not referenced, see <a href="#sct-domstring-backwards-compatibility">§ 2.1.1 Enumerations as DOMString types</a>.</p>
    <div>
-     <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①②④">Authenticators</a> may implement various <a href="#enum-transport">transports</a> for communicating with <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑥">clients</a>. This enumeration
+     <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①②④">Authenticators</a> may implement various <a href="#enum-transport">transports</a> for communicating with <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑧">clients</a>. This enumeration
     defines hints as to how clients might communicate with a particular authenticator in order to obtain an assertion for a
     specific credential. Note that these hints represent the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②③">WebAuthn Relying Party</a>'s best belief as to how an authenticator may be reached. A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⓪">Relying Party</a> will typically learn of the supported transports for a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③⑨">public key credential</a> via <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports⑤">getTransports()</a></code>. 
     <dl>
@@ -4538,11 +4583,11 @@ <h4 class="heading settled" data-level="5.8.4" id="enum-transport"><span class="
 These authenticators are not removable from the <a data-link-type="dfn" href="#client-device" id="ref-for-client-device①⑨">client device</a>.</p>
     </dl>
    </div>
-   <h4 class="heading settled" data-level="5.8.5" id="sctn-alg-identifier"><span class="secno">5.8.5. </span><span class="content">Cryptographic Algorithm Identifier (typedef <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier⑨">COSEAlgorithmIdentifier</a></code>)</span><a class="self-link" href="#sctn-alg-identifier"></a></h4>
+   <h4 class="heading settled" data-level="5.8.5" id="sctn-alg-identifier"><span class="secno">5.8.5. </span><span class="content">Cryptographic Algorithm Identifier (typedef <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier①⓪">COSEAlgorithmIdentifier</a></code>)</span><a class="self-link" href="#sctn-alg-identifier"></a></h4>
 <pre class="idl highlight def"><c- b>typedef</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-long" id="ref-for-idl-long"><c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-type="typedef" data-export id="typedefdef-cosealgorithmidentifier"><code><c- g>COSEAlgorithmIdentifier</c-></code></dfn>;
 </pre>
    <div>
-     A <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier①⓪">COSEAlgorithmIdentifier</a></code>'s value is a number identifying a cryptographic algorithm.
+     A <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier①①">COSEAlgorithmIdentifier</a></code>'s value is a number identifying a cryptographic algorithm.
     The algorithm identifiers SHOULD be values registered in the IANA COSE Algorithms registry <a data-link-type="biblio" href="#biblio-iana-cose-algs-reg" title="IANA CBOR Object Signing and Encryption (COSE) Algorithms Registry">[IANA-COSE-ALGS-REG]</a>,
     for instance, <code>-7</code> for "ES256" and <code>-257</code> for "RS256". 
     <p>The COSE algorithms registry leaves degrees of freedom to be specified by other parameters in a <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc9052#name-key-objects" id="ref-for-name-key-objects">COSE key</a>. In order to promote interoperability, this specification makes the following additional guarantees of <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②②">credential public keys</a>:</p>
@@ -4575,7 +4620,7 @@ <h4 class="heading settled" data-level="5.8.6" id="enum-userVerificationRequirem
      <dd data-md>
       <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧①">Relying Party</a> requires <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②⑦">user verification</a> for the operation and will fail the overall <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①①">ceremony</a> if the
 response does not have the <a data-link-type="dfn" href="#authdata-flags-uv" id="ref-for-authdata-flags-uv⑤">UV</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags⑨">flag</a> set.
-The <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑦">client</a> MUST return an error if <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②⑧">user verification</a> cannot be performed.</p>
+The <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑨">client</a> MUST return an error if <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②⑧">user verification</a> cannot be performed.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="UserVerificationRequirement" data-dfn-type="enum-value" data-export data-lt="&quot;preferred&quot;|preferred" id="dom-userverificationrequirement-preferred"><code>preferred</code></dfn>
      <dd data-md>
       <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧②">Relying Party</a> prefers <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②⑨">user verification</a> for the operation if possible, but will not fail the
@@ -4588,23 +4633,28 @@ <h4 class="heading settled" data-level="5.8.6" id="enum-userVerificationRequirem
    </div>
    <h4 class="heading settled" data-level="5.8.7" id="enum-clientCapability"><span class="secno">5.8.7. </span><span class="content">Client Capability Enumeration (enum <dfn class="dfn-paneled idl-code" data-dfn-type="enum" data-export id="enumdef-clientcapability"><code>ClientCapability</code></dfn>)</span><a class="self-link" href="#enum-clientCapability"></a></h4>
 <pre class="idl highlight def"><c- b>enum</c-> <a class="idl-code" data-link-type="enum" href="#enumdef-clientcapability" id="ref-for-enumdef-clientcapability①"><c- g>ClientCapability</c-></a> {
-    <a class="idl-code" data-link-type="enum-value" href="#dom-clientcapability-conditionalcreate" id="ref-for-dom-clientcapability-conditionalcreate①"><c- s>"conditionalCreate"</c-></a>,
-    <a class="idl-code" data-link-type="enum-value" href="#dom-clientcapability-conditionalget" id="ref-for-dom-clientcapability-conditionalget"><c- s>"conditionalGet"</c-></a>,
+    <a class="idl-code" data-link-type="enum-value" href="#dom-clientcapability-conditionalcreate" id="ref-for-dom-clientcapability-conditionalcreate②"><c- s>"conditionalCreate"</c-></a>,
+    <a class="idl-code" data-link-type="enum-value" href="#dom-clientcapability-conditionalget" id="ref-for-dom-clientcapability-conditionalget②"><c- s>"conditionalGet"</c-></a>,
     <a class="idl-code" data-link-type="enum-value" href="#dom-clientcapability-hybridtransport" id="ref-for-dom-clientcapability-hybridtransport"><c- s>"hybridTransport"</c-></a>,
     <a class="idl-code" data-link-type="enum-value" href="#dom-clientcapability-passkeyplatformauthenticator" id="ref-for-dom-clientcapability-passkeyplatformauthenticator"><c- s>"passkeyPlatformAuthenticator"</c-></a>,
     <a class="idl-code" data-link-type="enum-value" href="#dom-clientcapability-userverifyingplatformauthenticator" id="ref-for-dom-clientcapability-userverifyingplatformauthenticator"><c- s>"userVerifyingPlatformAuthenticator"</c-></a>,
+    <a class="idl-code" data-link-type="enum-value" href="#dom-clientcapability-relatedorigins" id="ref-for-dom-clientcapability-relatedorigins"><c- s>"relatedOrigins"</c-></a>
 };
 </pre>
    <p>This enumeration defines a limited set of client capabilities which a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑤">WebAuthn Relying Party</a> may evaluate to offer certain workflows and experiences to users.</p>
+   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧④">Relying Parties</a> may use the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientcapabilities" id="ref-for-dom-publickeycredential-getclientcapabilities③">getClientCapabilities()</a></code> method of <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②⑥">PublicKeyCredential</a></code> to obtain a description of available capabilities.</p>
    <p class="note" role="note"><span class="marker">Note:</span> The <code class="idl"><a data-link-type="idl" href="#enumdef-clientcapability" id="ref-for-enumdef-clientcapability②">ClientCapability</a></code> enumeration is deliberately not referenced, see <a href="#sct-domstring-backwards-compatibility">§ 2.1.1 Enumerations as DOMString types</a>.</p>
    <div>
     <dl>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ClientCapability" data-dfn-type="enum-value" data-export data-lt="&quot;conditionalCreate&quot;|conditionalCreate" id="dom-clientcapability-conditionalcreate"><code>conditionalCreate</code></dfn>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client⑦">WebAuthn Client</a> is capable of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional②②">conditional</a></code> mediation for <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑦">registration ceremonies</a>..</p>
+      <p>The <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client⑦">WebAuthn Client</a> is capable of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional②①">conditional</a></code> mediation for <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑦">registration ceremonies</a>..</p>
+      <p>See <a href="#sctn-createCredential">§ 5.1.3 Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a> for more details.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ClientCapability" data-dfn-type="enum-value" data-export data-lt="&quot;conditionalGet&quot;|conditionalGet" id="dom-clientcapability-conditionalget"><code>conditionalGet</code></dfn>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client⑧">WebAuthn Client</a> is capable of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional②③">conditional</a></code> mediation for <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⓪">authentication ceremonies</a>.</p>
+      <p>The <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client⑧">WebAuthn Client</a> is capable of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional②②">conditional</a></code> mediation for <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⓪">authentication ceremonies</a>.</p>
+      <p>This capability is equivalent to <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-isconditionalmediationavailable" id="ref-for-dom-publickeycredential-isconditionalmediationavailable②">isConditionalMediationAvailable()</a></code> resolving to <code>true</code>.</p>
+      <p>See <a href="#sctn-getAssertion">§ 5.1.4 Use an Existing Credential to Make an Assertion - PublicKeyCredential’s [[Get]](options) Method</a> for more details.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ClientCapability" data-dfn-type="enum-value" data-export data-lt="&quot;hybridTransport&quot;|hybridTransport" id="dom-clientcapability-hybridtransport"><code>hybridTransport</code></dfn>
      <dd data-md>
       <p>The <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client⑨">WebAuthn Client</a> supports usage of the <code class="idl"><a data-link-type="idl" href="#dom-authenticatortransport-hybrid" id="ref-for-dom-authenticatortransport-hybrid②">hybrid</a></code> transport.</p>
@@ -4614,6 +4664,9 @@ <h4 class="heading settled" data-level="5.8.7" id="enum-clientCapability"><span
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ClientCapability" data-dfn-type="enum-value" data-export data-lt="&quot;userVerifyingPlatformAuthenticator&quot;|userVerifyingPlatformAuthenticator" id="dom-clientcapability-userverifyingplatformauthenticator"><code>userVerifyingPlatformAuthenticator</code></dfn>
      <dd data-md>
       <p>The <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client①①">WebAuthn Client</a> supports usage of a <a data-link-type="dfn" href="#user-verifying-platform-authenticator" id="ref-for-user-verifying-platform-authenticator⑤">user-verifying platform authenticator</a>.</p>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ClientCapability" data-dfn-type="enum-value" data-export data-lt="&quot;relatedOrigins&quot;|relatedOrigins" id="dom-clientcapability-relatedorigins"><code>relatedOrigins</code></dfn>
+     <dd data-md>
+      <p>The <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client①②">WebAuthn Client</a> supports <a href="#sctn-related-origins">Related Origin Requests</a>.</p>
     </dl>
    </div>
    <h4 class="heading settled" data-level="5.8.8" id="enum-hints"><span class="secno">5.8.8. </span><span class="content">User-agent Hints Enumeration (enum <dfn class="dfn-paneled idl-code" data-dfn-type="enum" data-export id="enumdef-publickeycredentialhints"><code>PublicKeyCredentialHints</code></dfn>)</span><a class="self-link" href="#enum-hints"></a></h4>
@@ -4625,20 +4678,20 @@ <h4 class="heading settled" data-level="5.8.8" id="enum-hints"><span class="secn
 </pre>
    <p class="note" role="note"><span class="marker">Note:</span> The <code class="idl"><a data-link-type="idl" href="#enumdef-publickeycredentialhints" id="ref-for-enumdef-publickeycredentialhints③">PublicKeyCredentialHints</a></code> enumeration is deliberately not referenced, see <a href="#sct-domstring-backwards-compatibility">§ 2.1.1 Enumerations as DOMString types</a>.</p>
    <div>
-     <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑥">WebAuthn Relying Parties</a> may use this enumeration to communicate hints to the user-agent about how a request may be best completed. These hints are not requirements, and do not bind the user-agent, but may guide it in providing the best experience by using contextual information that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧④">Relying Party</a> has about the request. Hints are provided in order of decreasing preference so, if two hints are contradictory, the first one controls. Hints may also overlap: if a more-specific hint is defined a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑤">Relying Party</a> may still wish to send less specific ones for user-agents that may not recognise the more specific one. In this case the most specific hint should be sent before the less-specific ones. 
+     <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑥">WebAuthn Relying Parties</a> may use this enumeration to communicate hints to the user-agent about how a request may be best completed. These hints are not requirements, and do not bind the user-agent, but may guide it in providing the best experience by using contextual information that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑤">Relying Party</a> has about the request. Hints are provided in order of decreasing preference so, if two hints are contradictory, the first one controls. Hints may also overlap: if a more-specific hint is defined a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑥">Relying Party</a> may still wish to send less specific ones for user-agents that may not recognise the more specific one. In this case the most specific hint should be sent before the less-specific ones. 
     <p>Hints MAY contradict information contained in credential <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports①①">transports</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-authenticatorattachment" id="ref-for-dom-authenticatorselectioncriteria-authenticatorattachment②">authenticatorAttachment</a></code>. When this occurs, the hints take precedence. (Note that <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports①②">transports</a></code> values are not provided when using <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①③">discoverable credentials</a>, leaving hints as the only avenue for expressing some aspects of such a request.)</p>
     <dl>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialHints" data-dfn-type="enum-value" data-export data-lt="&quot;security-key&quot;|security-key" id="dom-publickeycredentialhints-security-key"><code>security-key</code></dfn>
      <dd data-md>
-      <p>Indicates that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑥">Relying Party</a> believes that users will satisfy this request with a physical security key. For example, an enterprise <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑦">Relying Party</a> may set this hint if they have issued security keys to their employees and will only accept those <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①③①">authenticators</a> for <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑧">registration</a> and <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②①">authentication</a>.</p>
+      <p>Indicates that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑦">Relying Party</a> believes that users will satisfy this request with a physical security key. For example, an enterprise <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑧">Relying Party</a> may set this hint if they have issued security keys to their employees and will only accept those <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①③①">authenticators</a> for <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑧">registration</a> and <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②①">authentication</a>.</p>
       <p>For compatibility with older user agents, when this hint is used in <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions⑧">PublicKeyCredentialCreationOptions</a></code>, the <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-authenticatorattachment" id="ref-for-dom-authenticatorselectioncriteria-authenticatorattachment③">authenticatorAttachment</a></code> SHOULD be set to <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattachment-cross-platform" id="ref-for-dom-authenticatorattachment-cross-platform①">cross-platform</a></code>.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialHints" data-dfn-type="enum-value" data-export data-lt="&quot;client-device&quot;|client-device" id="dom-publickeycredentialhints-client-device"><code>client-device</code></dfn>
      <dd data-md>
-      <p>Indicates that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑧">Relying Party</a> believes that users will satisfy this request with a <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators①⑤">platform authenticator</a> attached to the <a data-link-type="dfn" href="#client-device" id="ref-for-client-device②⓪">client device</a>.</p>
+      <p>Indicates that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑨">Relying Party</a> believes that users will satisfy this request with a <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators①⑤">platform authenticator</a> attached to the <a data-link-type="dfn" href="#client-device" id="ref-for-client-device②⓪">client device</a>.</p>
       <p>For compatibility with older user agents, when this hint is used in <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions⑨">PublicKeyCredentialCreationOptions</a></code>, the <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-authenticatorattachment" id="ref-for-dom-authenticatorselectioncriteria-authenticatorattachment④">authenticatorAttachment</a></code> SHOULD be set to <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattachment-platform" id="ref-for-dom-authenticatorattachment-platform①">platform</a></code>.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialHints" data-dfn-type="enum-value" data-export data-lt="&quot;hybrid&quot;|hybrid" id="dom-publickeycredentialhints-hybrid"><code>hybrid</code></dfn>
      <dd data-md>
-      <p>Indicates that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑨">Relying Party</a> believes that users will satisfy this request with general-purpose <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①③②">authenticators</a> such as smartphones. For example, a consumer <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⓪">Relying Party</a> may believe that only a small fraction of their customers possesses dedicated security keys. This option also implies that the local <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators①⑥">platform authenticator</a> should not be promoted in the UI.</p>
+      <p>Indicates that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⓪">Relying Party</a> believes that users will satisfy this request with general-purpose <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①③②">authenticators</a> such as smartphones. For example, a consumer <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨①">Relying Party</a> may believe that only a small fraction of their customers possesses dedicated security keys. This option also implies that the local <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators①⑥">platform authenticator</a> should not be promoted in the UI.</p>
       <p>For compatibility with older user agents, when this hint is used in <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions①⓪">PublicKeyCredentialCreationOptions</a></code>, the <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-authenticatorattachment" id="ref-for-dom-authenticatorselectioncriteria-authenticatorattachment⑤">authenticatorAttachment</a></code> SHOULD be set to <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattachment-cross-platform" id="ref-for-dom-authenticatorattachment-cross-platform②">cross-platform</a></code>.</p>
     </dl>
    </div>
@@ -4652,22 +4705,90 @@ <h3 class="heading settled" data-level="5.9" id="sctn-permissions-policy"><span
    <h3 class="heading settled" data-level="5.10" id="sctn-iframe-guidance"><span class="secno">5.10. </span><span class="content">Using Web Authentication within <code>iframe</code> elements</span><a class="self-link" href="#sctn-iframe-guidance"></a></h3>
    <p>The <a data-link-type="dfn" href="#web-authentication-api" id="ref-for-web-authentication-api①⑤">Web Authentication API</a> is disabled by default in cross-origin <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element" id="ref-for-the-iframe-element①">iframe</a></code>s.
 To override this default policy and indicate that a cross-origin <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element" id="ref-for-the-iframe-element②">iframe</a></code> is allowed to invoke the <a data-link-type="dfn" href="#web-authentication-api" id="ref-for-web-authentication-api①⑥">Web Authentication API</a>'s <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-slot" id="ref-for-dom-publickeycredential-discoverfromexternalsource-slot①②">[[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors)</a></code> method, specify the <code><a data-link-type="element-sub" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#attr-iframe-allow" id="ref-for-attr-iframe-allow">allow</a></code> attribute on the <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element" id="ref-for-the-iframe-element③">iframe</a></code> element and include the <code><a data-link-type="dfn" href="#publickey-credentials-get-feature" id="ref-for-publickey-credentials-get-feature">publickey-credentials-get</a></code> feature-identifier token in the <code><a data-link-type="element-sub" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#attr-iframe-allow" id="ref-for-attr-iframe-allow①">allow</a></code> attribute’s value.</p>
-   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨①">Relying Parties</a> utilizing the WebAuthn API in an embedded context should review <a href="#sctn-seccons-visibility">§ 13.4.2 Visibility Considerations for Embedded Usage</a> regarding <a data-link-type="dfn" href="#ui-redressing" id="ref-for-ui-redressing">UI redressing</a> and its possible mitigations.</p>
+   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨②">Relying Parties</a> utilizing the WebAuthn API in an embedded context should review <a href="#sctn-seccons-visibility">§ 13.4.2 Visibility Considerations for Embedded Usage</a> regarding <a data-link-type="dfn" href="#ui-redressing" id="ref-for-ui-redressing">UI redressing</a> and its possible mitigations.</p>
+   <h3 class="heading settled" data-level="5.11" id="sctn-related-origins"><span class="secno">5.11. </span><span class="content">Using Web Authentication across related origins</span><a class="self-link" href="#sctn-related-origins"></a></h3>
+   <p>By default, Web Authentication requires that the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⑧">RP ID</a> be equal to the <a data-link-type="dfn" href="#determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised" id="ref-for-determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised⑤">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain①④">effective domain</a>, or a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#is-a-registrable-domain-suffix-of-or-is-equal-to" id="ref-for-is-a-registrable-domain-suffix-of-or-is-equal-to④">registrable domain suffix</a> of the <a data-link-type="dfn" href="#determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised" id="ref-for-determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised⑥">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain①⑤">effective domain</a>.</p>
+   <p>This can make deployment challenging for large environments where multiple country-specific domains are in use (e.g. example.com vs example.co.uk vs example.sg), where alternative or brand domains are required (e.g. myexampletravel.com vs examplecruises.com), and/or where platform as a service providers are used to support mobile apps.</p>
+   <p><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑦">WebAuthn Relying Parties</a> can opt in to allowing <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client①③">WebAuthn Clients</a> to enable a credential to be created and used across a limited set of related <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①③">origins</a>.
+Such <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨③">Relying Parties</a> MUST choose a common <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⑨">RP ID</a> to use across all ceremonies from related origins.</p>
+   <p>A JSON document MUST be hosted at the <code>webauthn</code> well-known URL <a data-link-type="biblio" href="#biblio-rfc8615" title="Well-Known Uniform Resource Identifiers (URIs)">[RFC8615]</a> for the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⓪">RP ID</a>. The JSON document MUST be returned as follows:</p>
+   <ul>
+    <li data-md>
+     <p>The content type MUST be <code>application/json</code>.</p>
+    <li data-md>
+     <p>The top-level JSON object MUST contain a key named <code>origins</code> whose value MUST be an array of one or more strings containing web origins.</p>
+   </ul>
+   <p>For example, for the RP ID <code>example.com</code>:</p>
+<pre class="json highlight"><c- p>{</c->
+    <c- f>"origins"</c-><c- p>:</c-> <c- p>[</c->
+        <c- u>"https://example.co.uk"</c-><c- p>,</c->
+        <c- u>"https://example.de"</c-><c- p>,</c->
+        <c- u>"https://example.sg"</c-><c- p>,</c->
+        <c- u>"https://example.net"</c-><c- p>,</c->
+        <c- u>"https://exampledelivery.com"</c-><c- p>,</c->
+        <c- u>"https://exampledelivery.co.uk"</c-><c- p>,</c->
+        <c- u>"https://exampledelivery.de"</c-><c- p>,</c->
+        <c- u>"https://exampledelivery.sg"</c-><c- p>,</c->
+        <c- u>"https://myexamplerewards.com"</c-><c- p>,</c->
+        <c- u>"https://examplecars.com"</c->
+    <c- p>]</c->
+<c- p>}</c->
+</pre>
+   <p><a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client①④">WebAuthn Clients</a> supporting this feature MUST support at least five <a data-link-type="dfn" href="#registrable-origin-label" id="ref-for-registrable-origin-label①">registrable origin labels</a>. Client policy SHOULD define an upper limit to prevent abuse.</p>
+   <p><a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client①⑤">WebAuthn Clients</a> supporting this feature SHOULD include <code class="idl"><a data-link-type="idl" href="#dom-clientcapability-relatedorigins" id="ref-for-dom-clientcapability-relatedorigins①">relatedOrigins</a></code> in their response to <a href="#sctn-getClientCapabilities">getClientCapabilities()</a>.</p>
+   <h4 class="heading settled" data-level="5.11.1" id="sctn-validating-relation-origin"><span class="secno">5.11.1. </span><span class="content">Validating Related Origins</span><a class="self-link" href="#sctn-validating-relation-origin"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="abstract-op" data-export id="abstract-opdef-related-origins-validation-procedure">related origins validation procedure</dfn>, given arguments <var>callerOrigin</var> and <var>rpIdRequested</var>, is as follows:</p>
+   <ol>
+    <li data-md>
+     <p>Let <var>maxLabels</var> be the maximum number of <a data-link-type="dfn" href="#registrable-origin-label" id="ref-for-registrable-origin-label②">registrable origin labels</a> allowed by client policy.</p>
+    <li data-md>
+     <p>Fetch the <code>webauthn</code> well-known URL <a data-link-type="biblio" href="#biblio-rfc8615" title="Well-Known Uniform Resource Identifiers (URIs)">[RFC8615]</a> for the RP ID <var>rpIdRequested</var> (i.e., <code>https://<var>rpIdRequested</var>/.well-known/webauthn</code>).</p>
+     <ol>
+      <li data-md>
+       <p>If the fetch fails, the response does not have a content type of <code>application/json</code>, or does not have a status code (after following redirects) of 200, then throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror⑥">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②⑤">DOMException</a></code>.</p>
+      <li data-md>
+       <p>If the body of the resource is not a valid JSON object, then throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror⑦">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②⑥">DOMException</a></code>.</p>
+      <li data-md>
+       <p>If the value of the <var>origins</var> property of the JSON object is missing, or is not an array of strings, then throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror⑧">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②⑦">DOMException</a></code>.</p>
+     </ol>
+    <li data-md>
+     <p>Let <var>labelsSeen</var> be a new empty <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set⑥">set</a>.</p>
+    <li data-md>
+     <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①⑦">For each</a> <var>originItem</var> of <var>origins</var>:</p>
+     <ol>
+      <li data-md>
+       <p>Let <var>url</var> be the result of running the <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-url-parser" id="ref-for-concept-url-parser">URL parser</a> with <var>originItem</var> as the input. If that fails, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue①⑦">continue</a>.</p>
+      <li data-md>
+       <p>Let <var>domain</var> be the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain①⑥">effective domain</a> of <var>url</var>. If that is null, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue①⑧">continue</a>.</p>
+      <li data-md>
+       <p>Let <var>label</var> be <a data-link-type="dfn" href="#registrable-origin-label" id="ref-for-registrable-origin-label③">registrable origin label</a> of <var>domain</var>.</p>
+      <li data-md>
+       <p>If <var>label</var> is empty or null, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue①⑨">continue</a>.</p>
+      <li data-md>
+       <p>If the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size①">size</a> of <var>labelsSeen</var> is greater than or equal to <var>maxLabels</var> and <var>labelsSeen</var> does not <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-contain" id="ref-for-list-contain">contain</a> <var>label</var>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue②⓪">continue</a>.</p>
+      <li data-md>
+       <p>If <var>callerOrigin</var> and <var>url</var> are <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#same-origin" id="ref-for-same-origin">same origin</a>, return <code>true</code>.</p>
+      <li data-md>
+       <p>If the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size②">size</a> of <var>labelsSeen</var> is less than <var>maxLabels</var>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append④">append</a> <var>label</var> to <var>labelsSeen</var>.</p>
+     </ol>
+    <li data-md>
+     <p>Return <code>false</code>.</p>
+   </ol>
    <h2 class="heading settled" data-level="6" id="sctn-authenticator-model"><span class="secno">6. </span><span class="content">WebAuthn <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticator-model">Authenticator Model</dfn></span><a class="self-link" href="#sctn-authenticator-model"></a></h2>
    <p><a href="#sctn-api">The Web Authentication API</a> implies a specific abstract functional model for a <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator⑤">WebAuthn Authenticator</a>. This section
 describes that <a data-link-type="dfn" href="#authenticator-model" id="ref-for-authenticator-model②">authenticator model</a>.</p>
    <p><a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④④">Client platforms</a> MAY implement and expose this abstract model in any way desired. However, the behavior of the client’s Web
 Authentication API implementation, when operating on the authenticators supported by that <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑤">client platform</a>, MUST be indistinguishable
 from the behavior specified in <a href="#sctn-api">§ 5 Web Authentication API</a>.</p>
-   <p class="note" role="note"><span class="marker">Note:</span> <a data-link-type="biblio" href="#biblio-fido-ctap" title="Client to Authenticator Protocol (CTAP)">[FIDO-CTAP]</a> is an example of a concrete instantiation of this model, but it is one in which there are differences in the data it returns and those expected by the <a href="#sctn-api">WebAuthn API</a>'s algorithms. The CTAP2 response messages are CBOR maps constructed using integer keys rather than the string keys defined in this specification for the same objects. The <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑧">client</a> is expected to perform any needed transformations on such data. The <a data-link-type="biblio" href="#biblio-fido-ctap" title="Client to Authenticator Protocol (CTAP)">[FIDO-CTAP]</a> specification details the mapping between CTAP2 integer keys and WebAuthn string keys in Section <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.1-ps-20210615/fido-client-to-authenticator-protocol-v2.1-ps-errata-20220621.html#authenticator-api" id="ref-for-authenticator-api">§6. Authenticator API</a>.</p>
+   <p class="note" role="note"><span class="marker">Note:</span> <a data-link-type="biblio" href="#biblio-fido-ctap" title="Client to Authenticator Protocol (CTAP)">[FIDO-CTAP]</a> is an example of a concrete instantiation of this model, but it is one in which there are differences in the data it returns and those expected by the <a href="#sctn-api">WebAuthn API</a>'s algorithms. The CTAP2 response messages are CBOR maps constructed using integer keys rather than the string keys defined in this specification for the same objects. The <a data-link-type="dfn" href="#client" id="ref-for-client⑦⓪">client</a> is expected to perform any needed transformations on such data. The <a data-link-type="biblio" href="#biblio-fido-ctap" title="Client to Authenticator Protocol (CTAP)">[FIDO-CTAP]</a> specification details the mapping between CTAP2 integer keys and WebAuthn string keys in Section <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.1-ps-20210615/fido-client-to-authenticator-protocol-v2.1-ps-errata-20220621.html#authenticator-api" id="ref-for-authenticator-api">§6. Authenticator API</a>.</p>
    <p>For authenticators, this model defines the logical operations that they MUST support, and the data formats that they expose to
-the client and the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑦">WebAuthn Relying Party</a>. However, it does not define the details of how authenticators communicate with the <a data-link-type="dfn" href="#client-device" id="ref-for-client-device②①">client device</a>,
-unless they are necessary for interoperability with <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨②">Relying Parties</a>. For instance, this abstract model does not define protocols for
+the client and the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑧">WebAuthn Relying Party</a>. However, it does not define the details of how authenticators communicate with the <a data-link-type="dfn" href="#client-device" id="ref-for-client-device②①">client device</a>,
+unless they are necessary for interoperability with <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨④">Relying Parties</a>. For instance, this abstract model does not define protocols for
 connecting authenticators to clients over transports such as USB or NFC. Similarly, this abstract model does not define specific
 error codes or methods of returning them; however, it does define error behavior in terms of the needs of the client. Therefore,
 specific error codes are mentioned as a means of showing which error conditions MUST be distinguishable (or not) from each other
 in order to enable a compliant and secure client implementation.</p>
-   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨③">Relying Parties</a> may influence authenticator selection, if they deem necessary, by stipulating various authenticator characteristics
+   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑤">Relying Parties</a> may influence authenticator selection, if they deem necessary, by stipulating various authenticator characteristics
 when <a href="#sctn-createCredential">creating credentials</a> and/or when <a href="#sctn-getAssertion">generating assertions</a>, through use of <a href="#dictionary-makecredentialoptions">credential creation options</a> or <a href="#dictionary-assertion-options">assertion generation options</a>,
 respectively. The algorithms underlying the <a href="#sctn-api">WebAuthn API</a> marshal these options and pass them to the applicable <a href="#sctn-authenticator-ops">authenticator operations</a> defined below.</p>
    <p>In this abstract model, the authenticator provides key management and cryptographic signatures. It can be embedded in the
@@ -4679,13 +4800,13 @@ <h2 class="heading settled" data-level="6" id="sctn-authenticator-model"><span c
    <p>Additionally, each authenticator has an Authenticator Attestation Globally Unique Identifier or <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="aaguid">AAGUID</dfn>, which is a 128-bit identifier
 indicating the type (e.g. make and model) of the authenticator. The AAGUID MUST be chosen by its maker to be identical across all substantially identical
 authenticators made by that maker, and different (with high probability) from the AAGUIDs of all other types of authenticators. The AAGUID for a given type
-of authenticator SHOULD be randomly generated to ensure this. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨④">Relying Party</a> MAY use the AAGUID to infer certain properties of the authenticator, such as
-certification level and strength of key protection, using information from other sources. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑤">Relying Party</a> MAY use the AAGUID to attempt to identify the maker of
+of authenticator SHOULD be randomly generated to ensure this. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑥">Relying Party</a> MAY use the AAGUID to infer certain properties of the authenticator, such as
+certification level and strength of key protection, using information from other sources. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑦">Relying Party</a> MAY use the AAGUID to attempt to identify the maker of
 the authenticator without requesting and verifying <a data-link-type="dfn" href="#attestation" id="ref-for-attestation①②">attestation</a>, but the AAGUID is not provably authentic without <a data-link-type="dfn" href="#attestation" id="ref-for-attestation①③">attestation</a>.</p>
    <p>The primary function of the authenticator is to provide <a data-link-type="dfn" href="#webauthn-signature" id="ref-for-webauthn-signature①">WebAuthn signatures</a>, which are bound to various contextual data. These
 data are observed and added at different levels of the stack as a signature request passes from the server to the
 authenticator. In verifying a signature, the server checks these bindings against expected values. These contextual bindings
-are divided in two: Those added by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑥">Relying Party</a> or the client, referred to as <a data-link-type="dfn" href="#client-data" id="ref-for-client-data②">client data</a>; and those added by the authenticator,
+are divided in two: Those added by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑧">Relying Party</a> or the client, referred to as <a data-link-type="dfn" href="#client-data" id="ref-for-client-data②">client data</a>; and those added by the authenticator,
 referred to as the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①⑥">authenticator data</a>. The authenticator signs over the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data③">client data</a>, but is otherwise not interested in
 its contents. To save bandwidth and processing requirements on the authenticator, the client hashes the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data④">client data</a> and
 sends only the result to the authenticator. The authenticator signs over the combination of the <a data-link-type="dfn" href="#collectedclientdata-hash-of-the-serialized-client-data" id="ref-for-collectedclientdata-hash-of-the-serialized-client-data⑥">hash of the serialized client data</a>, and its own <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①⑦">authenticator data</a>.</p>
@@ -4698,7 +4819,7 @@ <h2 class="heading settled" data-level="6" id="sctn-authenticator-model"><span c
      <p>The data processed by the authenticator should be small and easy to interpret in low-level code. In particular, authenticators
 should not have to parse high-level encodings such as JSON.</p>
     <li data-md>
-     <p>Both the <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑨">client</a> and the authenticator should have the flexibility to add contextual bindings as needed.</p>
+     <p>Both the <a data-link-type="dfn" href="#client" id="ref-for-client⑦①">client</a> and the authenticator should have the flexibility to add contextual bindings as needed.</p>
     <li data-md>
      <p>The design aims to reuse as much as possible of existing encoding formats in order to aid adoption and implementation.</p>
    </ul>
@@ -4721,10 +4842,10 @@ <h2 class="heading settled" data-level="6" id="sctn-authenticator-model"><span c
 The formats of these signatures, as well as the procedures for generating them, are specified below.</p>
    <h3 class="heading settled" data-level="6.1" id="sctn-authenticator-data"><span class="secno">6.1. </span><span class="content">Authenticator Data</span><a class="self-link" href="#sctn-authenticator-data"></a></h3>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticator-data">authenticator data</dfn> structure encodes contextual bindings made by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①③⑧">authenticator</a>. These bindings are
-controlled by the authenticator itself, and derive their trust from the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑧">WebAuthn Relying Party</a>'s assessment of the security properties of the
+controlled by the authenticator itself, and derive their trust from the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑨">WebAuthn Relying Party</a>'s assessment of the security properties of the
 authenticator. In one extreme case, the authenticator may be embedded in the client, and its bindings may be no more trustworthy
 than the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data⑥">client data</a>. At the other extreme, the authenticator may be a discrete entity with high-security hardware and
-software, connected to the client over a secure channel. In both cases, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑦">Relying Party</a> receives the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①⑧">authenticator data</a> in the same
+software, connected to the client over a secure channel. In both cases, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑨">Relying Party</a> receives the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①⑧">authenticator data</a> in the same
 format, and uses its knowledge of the authenticator to make trust decisions.</p>
    <p>The <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①⑨">authenticator data</a> has a compact but extensible encoding. This is desired since authenticators can be devices with
 limited capabilities and low power requirements, with much simpler software stacks than the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑥">client platform</a>.</p>
@@ -4740,7 +4861,7 @@ <h3 class="heading settled" data-level="6.1" id="sctn-authenticator-data"><span
       <tr>
        <td><dfn class="dfn-paneled" data-dfn-for="authData" data-dfn-type="dfn" data-noexport id="authdata-rpidhash">rpIdHash</dfn>
        <td>32
-       <td> SHA-256 hash of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⑧">RP ID</a> the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential④②">credential</a> is <a data-link-type="dfn" href="#scope" id="ref-for-scope①④">scoped</a> to. 
+       <td> SHA-256 hash of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③①">RP ID</a> the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential④②">credential</a> is <a data-link-type="dfn" href="#scope" id="ref-for-scope①④">scoped</a> to. 
       <tr>
        <td><dfn class="dfn-paneled" data-dfn-for="authData" data-dfn-type="dfn" data-noexport id="authdata-flags">flags</dfn>
        <td>1
@@ -4815,15 +4936,15 @@ <h3 class="heading settled" data-level="6.1" id="sctn-authenticator-data"><span
     <figcaption> <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data②③">Authenticator data</a> layout. The names in the Name column are only for reference within this document, and are not
         present in the actual representation of the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data②④">authenticator data</a>. </figcaption>
    </figure>
-   <p>The <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⑨">RP ID</a> is originally received from the <a data-link-type="dfn" href="#client" id="ref-for-client⑦⓪">client</a> when the credential is created, and again when an <a data-link-type="dfn" href="#assertion" id="ref-for-assertion③">assertion</a> is generated.
-However, it differs from other <a data-link-type="dfn" href="#client-data" id="ref-for-client-data⑦">client data</a> in some important ways. First, unlike the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data⑧">client data</a>, the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⓪">RP ID</a> of a
+   <p>The <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③②">RP ID</a> is originally received from the <a data-link-type="dfn" href="#client" id="ref-for-client⑦②">client</a> when the credential is created, and again when an <a data-link-type="dfn" href="#assertion" id="ref-for-assertion③">assertion</a> is generated.
+However, it differs from other <a data-link-type="dfn" href="#client-data" id="ref-for-client-data⑦">client data</a> in some important ways. First, unlike the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data⑧">client data</a>, the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③③">RP ID</a> of a
 credential does not change between operations but instead remains the same for the lifetime of that credential. Secondly, it is
-validated by the authenticator during the <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion⑧">authenticatorGetAssertion</a> operation, by verifying that the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③①">RP ID</a> that
-the requested <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential④③">credential</a> is <a data-link-type="dfn" href="#scope" id="ref-for-scope①⑤">scoped</a> to exactly matches the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③②">RP ID</a> supplied by the <a data-link-type="dfn" href="#client" id="ref-for-client⑦①">client</a>.</p>
+validated by the authenticator during the <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion⑧">authenticatorGetAssertion</a> operation, by verifying that the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③④">RP ID</a> that
+the requested <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential④③">credential</a> is <a data-link-type="dfn" href="#scope" id="ref-for-scope①⑤">scoped</a> to exactly matches the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⑤">RP ID</a> supplied by the <a data-link-type="dfn" href="#client" id="ref-for-client⑦③">client</a>.</p>
    <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①③⑨">Authenticators</a> <dfn class="dfn-paneled" data-dfn-for="authenticator data" data-dfn-type="dfn" data-noexport id="authenticator-data-perform-the-following-steps-to-generate-an-authenticator-data-structure">perform the following steps to generate an <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data②⑤">authenticator data</a> structure</dfn>:</p>
    <ul>
     <li data-md>
-     <p>Hash <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③③">RP ID</a> using SHA-256 to generate the <a data-link-type="dfn" href="#authdata-rpidhash" id="ref-for-authdata-rpidhash">rpIdHash</a>.</p>
+     <p>Hash <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⑥">RP ID</a> using SHA-256 to generate the <a data-link-type="dfn" href="#authdata-rpidhash" id="ref-for-authdata-rpidhash">rpIdHash</a>.</p>
     <li data-md>
      <p>The <a data-link-type="dfn" href="#authdata-flags-up" id="ref-for-authdata-flags-up">UP</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags①①">flag</a> SHALL be set if and only if the authenticator performed a <a data-link-type="dfn" href="#test-of-user-presence" id="ref-for-test-of-user-presence⑥">test of user presence</a>.
 The <a data-link-type="dfn" href="#authdata-flags-uv" id="ref-for-authdata-flags-uv⑦">UV</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags①②">flag</a> SHALL be set if and only if the authenticator performed <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification③①">user verification</a>.
@@ -4850,15 +4971,15 @@ <h3 class="heading settled" data-level="6.1" id="sctn-authenticator-data"><span
    </div>
    <h4 class="heading settled" data-level="6.1.1" id="sctn-sign-counter"><span class="secno">6.1.1. </span><span class="content"><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="signature-counter">Signature Counter</dfn> Considerations</span><a class="self-link" href="#sctn-sign-counter"></a></h4>
    <p>Authenticators SHOULD implement a <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter②">signature counter</a> feature. These counters are conceptually stored for each credential
-by the authenticator, or globally for the authenticator as a whole. The initial value of a credential’s <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter③">signature counter</a> is specified in the <code><a data-link-type="dfn" href="#authdata-signcount" id="ref-for-authdata-signcount①">signCount</a></code> value of the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data②⑨">authenticator data</a> returned by <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential①①">authenticatorMakeCredential</a>. The <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter④">signature counter</a> is incremented for each successful <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion⑨">authenticatorGetAssertion</a> operation by some positive value, and subsequent values are returned to the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑨">WebAuthn Relying Party</a> within the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data③⓪">authenticator data</a> again. The <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑤">signature counter</a>'s purpose is to aid <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑧">Relying Parties</a> in detecting cloned authenticators. Clone
+by the authenticator, or globally for the authenticator as a whole. The initial value of a credential’s <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter③">signature counter</a> is specified in the <code><a data-link-type="dfn" href="#authdata-signcount" id="ref-for-authdata-signcount①">signCount</a></code> value of the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data②⑨">authenticator data</a> returned by <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential①①">authenticatorMakeCredential</a>. The <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter④">signature counter</a> is incremented for each successful <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion⑨">authenticatorGetAssertion</a> operation by some positive value, and subsequent values are returned to the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⓪">WebAuthn Relying Party</a> within the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data③⓪">authenticator data</a> again. The <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑤">signature counter</a>'s purpose is to aid <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⓪">Relying Parties</a> in detecting cloned authenticators. Clone
 detection is more important for authenticators with limited protection measures.</p>
    <p>Authenticators that do not implement a <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑥">signature counter</a> leave the <code><a data-link-type="dfn" href="#authdata-signcount" id="ref-for-authdata-signcount②">signCount</a></code> in the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data③①">authenticator data</a> constant at zero.</p>
-   <p>A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑨">Relying Party</a> stores the <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑦">signature counter</a> of the most recent <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①⓪">authenticatorGetAssertion</a> operation. (Or the counter from the <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential①②">authenticatorMakeCredential</a> operation if no <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①①">authenticatorGetAssertion</a> has ever been performed on a credential.) In subsequent <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①②">authenticatorGetAssertion</a> operations, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⓪">Relying Party</a> compares the stored <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑧">signature counter</a> value with the new <code><a data-link-type="dfn" href="#authdata-signcount" id="ref-for-authdata-signcount③">signCount</a></code> value returned in the assertion’s <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data③②">authenticator data</a>. If either is non-zero, and the new <code><a data-link-type="dfn" href="#authdata-signcount" id="ref-for-authdata-signcount④">signCount</a></code> value is less than or equal to the stored value, a cloned authenticator may exist, or the authenticator may be malfunctioning.</p>
-   <p>Detecting a <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑨">signature counter</a> mismatch does not indicate whether the current operation was performed by a cloned authenticator or the original authenticator. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪①">Relying Parties</a> should address this situation appropriately relative to their individual situations, i.e., their risk tolerance.</p>
+   <p>A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪①">Relying Party</a> stores the <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑦">signature counter</a> of the most recent <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①⓪">authenticatorGetAssertion</a> operation. (Or the counter from the <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential①②">authenticatorMakeCredential</a> operation if no <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①①">authenticatorGetAssertion</a> has ever been performed on a credential.) In subsequent <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①②">authenticatorGetAssertion</a> operations, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪②">Relying Party</a> compares the stored <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑧">signature counter</a> value with the new <code><a data-link-type="dfn" href="#authdata-signcount" id="ref-for-authdata-signcount③">signCount</a></code> value returned in the assertion’s <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data③②">authenticator data</a>. If either is non-zero, and the new <code><a data-link-type="dfn" href="#authdata-signcount" id="ref-for-authdata-signcount④">signCount</a></code> value is less than or equal to the stored value, a cloned authenticator may exist, or the authenticator may be malfunctioning.</p>
+   <p>Detecting a <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑨">signature counter</a> mismatch does not indicate whether the current operation was performed by a cloned authenticator or the original authenticator. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪③">Relying Parties</a> should address this situation appropriately relative to their individual situations, i.e., their risk tolerance.</p>
    <p>Authenticators:</p>
    <ul>
     <li data-md>
-     <p>SHOULD implement per credential <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter①⓪">signature counters</a>.  This prevents the <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter①①">signature counter</a> value from being shared between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪②">Relying Parties</a> and being possibly employed
+     <p>SHOULD implement per credential <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter①⓪">signature counters</a>.  This prevents the <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter①①">signature counter</a> value from being shared between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪④">Relying Parties</a> and being possibly employed
 as a correlation handle for the user. Authenticators MAY implement a global <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter①②">signature counter</a>,
 i.e., on a per-authenticator basis, but this is less privacy-friendly for users.</p>
     <li data-md>
@@ -4902,25 +5023,25 @@ <h4 class="heading settled" data-level="6.1.3" id="sctn-credential-backup"><span
     </table>
     <figcaption> <a data-link-type="dfn" href="#authdata-flags-be" id="ref-for-authdata-flags-be④">BE</a> and <a data-link-type="dfn" href="#authdata-flags-bs" id="ref-for-authdata-flags-bs④">BS</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags②⑥">flag</a> combinations </figcaption>
    </figure>
-   <p>It is RECOMMENDED that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪③">Relying Parties</a> store the most recent value of these <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags②⑦">flags</a> with the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②⑨">user account</a> for future evaluation.</p>
-   <p>The following is a non-exhaustive list of how <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪④">Relying Parties</a> might use these <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags②⑧">flags</a>:</p>
+   <p>It is RECOMMENDED that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑤">Relying Parties</a> store the most recent value of these <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags②⑦">flags</a> with the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②⑨">user account</a> for future evaluation.</p>
+   <p>The following is a non-exhaustive list of how <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑥">Relying Parties</a> might use these <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags②⑧">flags</a>:</p>
    <ul>
     <li data-md>
      <p>Requiring additional <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④⓪">authenticators</a>:</p>
      <p>When the <a data-link-type="dfn" href="#authdata-flags-be" id="ref-for-authdata-flags-be⑤">BE</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags②⑨">flag</a> is set to <code>0</code>, the credential is a <a data-link-type="dfn" href="#single-device-credential" id="ref-for-single-device-credential②">single-device credential</a> and the <a data-link-type="dfn" href="#generating-authenticator" id="ref-for-generating-authenticator③">generating authenticator</a> will never
 allow the credential to be backed up.</p>
-     <p>A <a data-link-type="dfn" href="#single-device-credential" id="ref-for-single-device-credential③">single-device credential</a> is not resilient to single device loss. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑤">Relying Parties</a> SHOULD ensure that each <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⓪">user account</a> has additional <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④①">authenticators</a> <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑨">registered</a> and/or an account recovery process in place.
+     <p>A <a data-link-type="dfn" href="#single-device-credential" id="ref-for-single-device-credential③">single-device credential</a> is not resilient to single device loss. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑦">Relying Parties</a> SHOULD ensure that each <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⓪">user account</a> has additional <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④①">authenticators</a> <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑨">registered</a> and/or an account recovery process in place.
 For example, the user could be prompted to set up an additional <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④②">authenticator</a>, such as a <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators⑦">roaming authenticator</a> or an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④③">authenticator</a> that is capable of <a data-link-type="dfn" href="#multi-device-credential" id="ref-for-multi-device-credential⑤">multi-device credentials</a>.</p>
     <li data-md>
      <p>Upgrading a user to a password-free account:</p>
      <p>When the <a data-link-type="dfn" href="#authdata-flags-bs" id="ref-for-authdata-flags-bs⑤">BS</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③⓪">flag</a> changes from <code>0</code> to <code>1</code>, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④④">authenticator</a> is signaling that the <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①④">credential</a> is backed up and is protected from single device loss.</p>
-     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑥">Relying Party</a> MAY choose to prompt the user to upgrade their account security and remove their password.</p>
+     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑧">Relying Party</a> MAY choose to prompt the user to upgrade their account security and remove their password.</p>
     <li data-md>
      <p>Adding an additional factor after a state change:</p>
      <p>When the <a data-link-type="dfn" href="#authdata-flags-bs" id="ref-for-authdata-flags-bs⑥">BS</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③①">flag</a> changes from <code>1</code> to <code>0</code>, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④⑤">authenticator</a> is signaling that the <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⑤">credential</a> is no longer backed up,
 and no longer protected from single device loss. This could be the result of the user actions, such as disabling the backup service,
 or errors, such as issues with the backup service.</p>
-     <p>When this transition occurs, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑦">Relying Party</a> SHOULD guide the user through a process to validate their other authentication factors.
+     <p>When this transition occurs, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑨">Relying Party</a> SHOULD guide the user through a process to validate their other authentication factors.
 If the user does not have another credential for their account, they SHOULD be guided through adding an additional credential
 to ensure they do not lose access to their account. For example, the user could be prompted to set up an additional <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④⑥">authenticator</a>,
 such as a <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators⑧">roaming authenticator</a> or an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④⑦">authenticator</a> that is capable of <a data-link-type="dfn" href="#multi-device-credential" id="ref-for-multi-device-credential⑥">multi-device credentials</a>.</p>
@@ -4950,7 +5071,7 @@ <h3 class="heading settled" data-level="6.2" id="sctn-authenticator-taxonomy"><s
     <li data-md>
      <p>Whether the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤①">authenticator</a> is a <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators①①">roaming</a> or <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators①⑧">platform</a> authenticator,
 or in some cases both — the <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality①①">authenticator attachment modality</a>.
-A <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators①②">roaming authenticator</a> can support one or more <a href="#enum-transport">transports</a> for communicating with the <a data-link-type="dfn" href="#client" id="ref-for-client⑦②">client</a>.</p>
+A <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators①②">roaming authenticator</a> can support one or more <a href="#enum-transport">transports</a> for communicating with the <a data-link-type="dfn" href="#client" id="ref-for-client⑦④">client</a>.</p>
     <li data-md>
      <p>Whether the authenticator is capable of <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification③④">user verification</a> — the <a data-link-type="dfn" href="#authentication-factor-capability" id="ref-for-authentication-factor-capability">authentication factor capability</a>.</p>
     <li data-md>
@@ -5005,7 +5126,7 @@ <h3 class="heading settled" data-level="6.2" id="sctn-authenticator-taxonomy"><s
 these authenticators support <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification③⑤">user verification</a> as a second <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af⑦">authentication factor</a>,
 typically a PIN or <a data-link-type="dfn" href="#biometric-recognition" id="ref-for-biometric-recognition③">biometric recognition</a>.
 The <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤②">authenticator</a> can thus act as two kinds of <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af⑧">authentication factor</a>,
-which enables <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af⑨">multi-factor</a> authentication while eliminating the need to share a password with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑧">Relying Party</a>.</p>
+which enables <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af⑨">multi-factor</a> authentication while eliminating the need to share a password with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⓪">Relying Party</a>.</p>
    <p>The combinations not named in <a href="#table-authenticatorTypes">Table <span class="table-ref-previous"></span></a> have less distinguished use cases:</p>
    <ul>
     <li data-md>
@@ -5018,7 +5139,7 @@ <h3 class="heading settled" data-level="6.2" id="sctn-authenticator-taxonomy"><s
    </ul>
    <p>The following subsections define the aspects <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality①③">authenticator attachment modality</a>, <a data-link-type="dfn" href="#credential-storage-modality" id="ref-for-credential-storage-modality②">credential storage modality</a> and <a data-link-type="dfn" href="#authentication-factor-capability" id="ref-for-authentication-factor-capability②">authentication factor capability</a> in more depth.</p>
    <h4 class="heading settled" data-level="6.2.1" id="sctn-authenticator-attachment-modality"><span class="secno">6.2.1. </span><span class="content"><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticator-attachment-modality">Authenticator Attachment Modality</dfn></span><a class="self-link" href="#sctn-authenticator-attachment-modality"></a></h4>
-   <p><a data-link-type="dfn" href="#client" id="ref-for-client⑦③">Clients</a> can communicate with <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤④">authenticators</a> using a variety of mechanisms. For example, a <a data-link-type="dfn" href="#client" id="ref-for-client⑦④">client</a> MAY use a <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③⓪">client device</a>-specific API to communicate with an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤⑤">authenticator</a> which is physically bound to a <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③①">client device</a>. On the other hand, a <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑤">client</a> can use a variety of standardized cross-platform transport protocols such as Bluetooth (see <a href="#enum-transport">§ 5.8.4 Authenticator Transport Enumeration (enum AuthenticatorTransport)</a>) to discover
+   <p><a data-link-type="dfn" href="#client" id="ref-for-client⑦⑤">Clients</a> can communicate with <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤④">authenticators</a> using a variety of mechanisms. For example, a <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑥">client</a> MAY use a <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③⓪">client device</a>-specific API to communicate with an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤⑤">authenticator</a> which is physically bound to a <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③①">client device</a>. On the other hand, a <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑦">client</a> can use a variety of standardized cross-platform transport protocols such as Bluetooth (see <a href="#enum-transport">§ 5.8.4 Authenticator Transport Enumeration (enum AuthenticatorTransport)</a>) to discover
 and communicate with <a data-link-type="dfn" href="#cross-platform-attachment" id="ref-for-cross-platform-attachment⑤">cross-platform attached</a> <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤⑥">authenticators</a>. We refer to <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤⑦">authenticators</a> that
 are part of the <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③②">client device</a> as <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="platform-authenticators">platform authenticators</dfn>, while those that are reachable via cross-platform
 transport protocols are referred to as <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="roaming-authenticators">roaming authenticators</dfn>.</p>
@@ -5033,8 +5154,8 @@ <h4 class="heading settled" data-level="6.2.1" id="sctn-authenticator-attachment
    </ul>
    <p>Some <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators②①">platform authenticators</a> could possibly also act as <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators①⑦">roaming authenticators</a> depending on context. For example, a <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators②②">platform authenticator</a> integrated into a mobile device could make itself available as a <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators①⑧">roaming authenticator</a> via
 Bluetooth.
-In this case <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑥">clients</a> running on the mobile device would recognise the authenticator as a <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators②③">platform authenticator</a>,
-while <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑦">clients</a> running on a different <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③⑥">client device</a> and communicating with the same authenticator via Bluetooth
+In this case <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑧">clients</a> running on the mobile device would recognise the authenticator as a <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators②③">platform authenticator</a>,
+while <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑨">clients</a> running on a different <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③⑥">client device</a> and communicating with the same authenticator via Bluetooth
 would recognize it as a <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators①⑨">roaming authenticator</a>.</p>
    <p>The primary use case for <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators②④">platform authenticators</a> is to register a particular <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③⑦">client device</a> as a "trusted device",
 so the <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③⑧">client device</a> itself acts as a <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af①②">something you have</a> <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af①③">authentication factor</a> for future <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①①">authentication</a>.
@@ -5051,12 +5172,12 @@ <h4 class="heading settled" data-level="6.2.2" id="sctn-credential-storage-modal
    <p>An <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⓪">authenticator</a> can store a <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑤⑤">public key credential source</a> in one of two ways:</p>
    <ol>
     <li data-md>
-     <p>In persistent storage embedded in the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥①">authenticator</a>, <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑧">client</a> or <a data-link-type="dfn" href="#client-device" id="ref-for-client-device④④">client device</a>, e.g., in a secure element.
+     <p>In persistent storage embedded in the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥①">authenticator</a>, <a data-link-type="dfn" href="#client" id="ref-for-client⑧⓪">client</a> or <a data-link-type="dfn" href="#client-device" id="ref-for-client-device④④">client device</a>, e.g., in a secure element.
 This is a technical requirement for a <a data-link-type="dfn" href="#client-side-discoverable-public-key-credential-source" id="ref-for-client-side-discoverable-public-key-credential-source③">client-side discoverable public key credential source</a>.</p>
     <li data-md>
      <p>By encrypting (i.e., wrapping) the <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑤⑥">public key credential source</a> such that only this <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥②">authenticator</a> can decrypt (i.e., unwrap) it and letting the resulting
-ciphertext be the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id②④">credential ID</a> of the <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑤⑦">public key credential source</a>. The <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id②⑤">credential ID</a> is stored by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑨">Relying Party</a> and returned to the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥③">authenticator</a> via the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials①⑧">allowCredentials</a></code> option of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⑨">get()</a></code>, which allows the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥④">authenticator</a> to decrypt and use the <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑤⑧">public key credential source</a>.</p>
-     <p>This enables the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⑤">authenticator</a> to have unlimited credential storage capacity, since the encrypted <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑤⑨">public key credential sources</a> are stored by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⓪">Relying Party</a> instead of by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⑥">authenticator</a> - but it means that a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⑥">credential</a> stored in this way must be retrieved from the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①①">Relying Party</a> before the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⑦">authenticator</a> can use it.</p>
+ciphertext be the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id②④">credential ID</a> of the <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑤⑦">public key credential source</a>. The <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id②⑤">credential ID</a> is stored by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①①">Relying Party</a> and returned to the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥③">authenticator</a> via the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials①⑧">allowCredentials</a></code> option of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⑨">get()</a></code>, which allows the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥④">authenticator</a> to decrypt and use the <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑤⑧">public key credential source</a>.</p>
+     <p>This enables the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⑤">authenticator</a> to have unlimited credential storage capacity, since the encrypted <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑤⑨">public key credential sources</a> are stored by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①②">Relying Party</a> instead of by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⑥">authenticator</a> - but it means that a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⑥">credential</a> stored in this way must be retrieved from the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①③">Relying Party</a> before the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⑦">authenticator</a> can use it.</p>
    </ol>
    <p>Which of these storage strategies an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⑧">authenticator</a> supports defines the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⑨">authenticator</a>'s <dfn class="dfn-paneled" data-dfn-type="dfn" data-lt="credential storage modality" data-noexport id="credential-storage-modality">credential storage
 modality</dfn> as follows:</p>
@@ -5079,10 +5200,10 @@ <h4 class="heading settled" data-level="6.2.3" id="sctn-authentication-factor-ca
 verification</a> can also act as one or two additional kinds of <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af①⑨">authentication factor</a>. For example, if the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑦⑥">authenticator</a> can
 verify a PIN, the PIN is <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②⓪">something you know</a>, and a <a data-link-type="dfn" href="#biometric-authenticator" id="ref-for-biometric-authenticator">biometric authenticator</a> can verify <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②①">something you are</a>. Therefore, an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑦⑦">authenticator</a> that supports <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification③⑦">user verification</a> is <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="multi-factor-capable">multi-factor capable</dfn>. Conversely, an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑦⑧">authenticator</a> that is
 not <a data-link-type="dfn" href="#multi-factor-capable" id="ref-for-multi-factor-capable⑤">multi-factor capable</a> is <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="single-factor-capable">single-factor capable</dfn>. Note that a single <a data-link-type="dfn" href="#multi-factor-capable" id="ref-for-multi-factor-capable⑥">multi-factor capable</a> <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑦⑨">authenticator</a> could support several modes of <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification③⑧">user verification</a>, meaning it could act as all three kinds of <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②②">authentication factor</a>.</p>
-   <p>Although <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification③⑨">user verification</a> is performed locally on the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧⓪">authenticator</a> and not by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①②">Relying Party</a>, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧①">authenticator</a> indicates if <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④⓪">user verification</a> was performed by setting the <a data-link-type="dfn" href="#authdata-flags-uv" id="ref-for-authdata-flags-uv⑨">UV</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③②">flag</a> in the signed response returned to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①③">Relying Party</a>.
-The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①④">Relying Party</a> can therefore use the <a data-link-type="dfn" href="#authdata-flags-uv" id="ref-for-authdata-flags-uv①⓪">UV</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③③">flag</a> to verify that additional <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②③">authentication factors</a> were used in a <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑧">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②④">authentication ceremony</a>. The authenticity of the <a data-link-type="dfn" href="#authdata-flags-uv" id="ref-for-authdata-flags-uv①①">UV</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③④">flag</a> can in turn be assessed by inspecting the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧②">authenticator</a>'s <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⑧">attestation statement</a>.</p>
+   <p>Although <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification③⑨">user verification</a> is performed locally on the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧⓪">authenticator</a> and not by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①④">Relying Party</a>, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧①">authenticator</a> indicates if <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④⓪">user verification</a> was performed by setting the <a data-link-type="dfn" href="#authdata-flags-uv" id="ref-for-authdata-flags-uv⑨">UV</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③②">flag</a> in the signed response returned to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑤">Relying Party</a>.
+The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑥">Relying Party</a> can therefore use the <a data-link-type="dfn" href="#authdata-flags-uv" id="ref-for-authdata-flags-uv①⓪">UV</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③③">flag</a> to verify that additional <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②③">authentication factors</a> were used in a <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑧">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②④">authentication ceremony</a>. The authenticity of the <a data-link-type="dfn" href="#authdata-flags-uv" id="ref-for-authdata-flags-uv①①">UV</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③④">flag</a> can in turn be assessed by inspecting the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧②">authenticator</a>'s <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⑧">attestation statement</a>.</p>
    <h3 class="heading settled" data-level="6.3" id="sctn-authenticator-ops"><span class="secno">6.3. </span><span class="content"><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticator-operations">Authenticator Operations</dfn></span><a class="self-link" href="#sctn-authenticator-ops"></a></h3>
-   <p>A <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client①②">WebAuthn Client</a> MUST connect to an authenticator in order to invoke any of the operations of that authenticator. This connection
+   <p>A <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client①⑥">WebAuthn Client</a> MUST connect to an authenticator in order to invoke any of the operations of that authenticator. This connection
 defines an <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticator-session">authenticator session</dfn>. An authenticator must maintain isolation between sessions. It may do this by only allowing one
 session to exist at any particular time, or by providing more complicated session management.</p>
    <p>The following operations can be invoked by the client in an authenticator session.</p>
@@ -5114,26 +5235,26 @@ <h4 class="heading settled" data-level="6.3.2" id="sctn-op-make-cred"><span clas
      <p>The <a data-link-type="dfn" href="#collectedclientdata-hash-of-the-serialized-client-data" id="ref-for-collectedclientdata-hash-of-the-serialized-client-data⑨">hash of the serialized client data</a>, provided by the client.</p>
     <dt data-md><var>rpEntity</var>
     <dd data-md>
-     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑤">Relying Party</a>'s <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity⑥">PublicKeyCredentialRpEntity</a></code>.</p>
+     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑦">Relying Party</a>'s <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity⑥">PublicKeyCredentialRpEntity</a></code>.</p>
     <dt data-md><var>userEntity</var>
     <dd data-md>
-     <p>The <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③①">user account’s</a> <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialuserentity" id="ref-for-dictdef-publickeycredentialuserentity⑤">PublicKeyCredentialUserEntity</a></code>, containing the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②②">user handle</a> given by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑥">Relying Party</a>.</p>
+     <p>The <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③①">user account’s</a> <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialuserentity" id="ref-for-dictdef-publickeycredentialuserentity⑤">PublicKeyCredentialUserEntity</a></code>, containing the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②②">user handle</a> given by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑧">Relying Party</a>.</p>
     <dt data-md><var>requireResidentKey</var>
     <dd data-md>
-     <p>The <a data-link-type="dfn" href="#effective-resident-key-requirement-for-credential-creation" id="ref-for-effective-resident-key-requirement-for-credential-creation">effective resident key requirement for credential creation</a>, a Boolean value determined by the <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑨">client</a>.</p>
+     <p>The <a data-link-type="dfn" href="#effective-resident-key-requirement-for-credential-creation" id="ref-for-effective-resident-key-requirement-for-credential-creation">effective resident key requirement for credential creation</a>, a Boolean value determined by the <a data-link-type="dfn" href="#client" id="ref-for-client⑧①">client</a>.</p>
     <dt data-md><var>requireUserPresence</var>
     <dd data-md>
-     <p>The constant Boolean value <code>true</code>, or <var>FALSE</var> when <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialcreationoptions-mediation" id="ref-for-dom-credentialcreationoptions-mediation⑥">mediation</a></code></code> is set to <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional②④">conditional</a></code> and the user agent previously collected consent from the user.</p>
+     <p>The constant Boolean value <code>true</code>, or <var>FALSE</var> when <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialcreationoptions-mediation" id="ref-for-dom-credentialcreationoptions-mediation⑥">mediation</a></code></code> is set to <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional②③">conditional</a></code> and the user agent previously collected consent from the user.</p>
     <dt data-md><var>requireUserVerification</var>
     <dd data-md>
-     <p>The <a data-link-type="dfn" href="#effective-user-verification-requirement-for-credential-creation" id="ref-for-effective-user-verification-requirement-for-credential-creation">effective user verification requirement for credential creation</a>, a Boolean value determined by the <a data-link-type="dfn" href="#client" id="ref-for-client⑧⓪">client</a>.</p>
+     <p>The <a data-link-type="dfn" href="#effective-user-verification-requirement-for-credential-creation" id="ref-for-effective-user-verification-requirement-for-credential-creation">effective user verification requirement for credential creation</a>, a Boolean value determined by the <a data-link-type="dfn" href="#client" id="ref-for-client⑧②">client</a>.</p>
     <dt data-md><var>credTypesAndPubKeyAlgs</var>
     <dd data-md>
-     <p>A sequence of pairs of <code class="idl"><a data-link-type="idl" href="#enumdef-publickeycredentialtype" id="ref-for-enumdef-publickeycredentialtype⑧">PublicKeyCredentialType</a></code> and public key algorithms (<code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier①①">COSEAlgorithmIdentifier</a></code>) requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑦">Relying Party</a>. This sequence is ordered from most preferred to least preferred. The <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧④">authenticator</a> makes a best-effort to create the most
+     <p>A sequence of pairs of <code class="idl"><a data-link-type="idl" href="#enumdef-publickeycredentialtype" id="ref-for-enumdef-publickeycredentialtype⑧">PublicKeyCredentialType</a></code> and public key algorithms (<code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier①②">COSEAlgorithmIdentifier</a></code>) requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑨">Relying Party</a>. This sequence is ordered from most preferred to least preferred. The <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧④">authenticator</a> makes a best-effort to create the most
 preferred credential that it can.</p>
     <dt data-md><var>excludeCredentialDescriptorList</var>
     <dd data-md>
-     <p>An OPTIONAL list of <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor①②">PublicKeyCredentialDescriptor</a></code> objects provided by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑧">Relying Party</a> with the intention that, if any of
+     <p>An OPTIONAL list of <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor①②">PublicKeyCredentialDescriptor</a></code> objects provided by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⓪">Relying Party</a> with the intention that, if any of
 these are known to the authenticator, it SHOULD NOT create a new credential. <var>excludeCredentialDescriptorList</var> contains a
 list of known credentials.</p>
     <dt data-md><var>enterpriseAttestationPossible</var>
@@ -5141,11 +5262,11 @@ <h4 class="heading settled" data-level="6.3.2" id="sctn-op-make-cred"><span clas
      <p>A Boolean value that indicates that individually-identifying attestation MAY be returned by the authenticator.</p>
     <dt data-md><var>attestationFormats</var>
     <dd data-md>
-     <p>A sequence of strings that expresses the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑨">Relying Party</a>'s preference for attestation statement formats, from most to least preferable. If the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧⑤">authenticator</a> returns <a data-link-type="dfn" href="#attestation" id="ref-for-attestation①⑥">attestation</a>, then it makes a best-effort attempt to use the most preferable format that it supports.</p>
+     <p>A sequence of strings that expresses the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②①">Relying Party</a>'s preference for attestation statement formats, from most to least preferable. If the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧⑤">authenticator</a> returns <a data-link-type="dfn" href="#attestation" id="ref-for-attestation①⑥">attestation</a>, then it makes a best-effort attempt to use the most preferable format that it supports.</p>
     <dt data-md><var>extensions</var>
     <dd data-md>
-     <p>A <a data-link-type="dfn" href="#cbor" id="ref-for-cbor⑨">CBOR</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map①⓪">map</a> from <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier⑥">extension identifiers</a> to their <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①">authenticator extension inputs</a>, created by the <a data-link-type="dfn" href="#client" id="ref-for-client⑧①">client</a> based on
-the extensions requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⓪">Relying Party</a>, if any.</p>
+     <p>A <a data-link-type="dfn" href="#cbor" id="ref-for-cbor⑨">CBOR</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map①⓪">map</a> from <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier⑥">extension identifiers</a> to their <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①">authenticator extension inputs</a>, created by the <a data-link-type="dfn" href="#client" id="ref-for-client⑧③">client</a> based on
+the extensions requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②②">Relying Party</a>, if any.</p>
    </dl>
    <p class="note" role="note"><span class="marker">Note:</span> Before performing this operation, all other operations in progress in the <a data-link-type="dfn" href="#authenticator-session" id="ref-for-authenticator-session②">authenticator session</a> MUST be aborted by
 running the <a data-link-type="dfn" href="#authenticatorcancel" id="ref-for-authenticatorcancel①①">authenticatorCancel</a> operation.</p>
@@ -5158,11 +5279,11 @@ <h4 class="heading settled" data-level="6.3.2" id="sctn-op-make-cred"><span clas
      <p>Check if at least one of the specified combinations of <code class="idl"><a data-link-type="idl" href="#enumdef-publickeycredentialtype" id="ref-for-enumdef-publickeycredentialtype⑨">PublicKeyCredentialType</a></code> and cryptographic parameters in <var>credTypesAndPubKeyAlgs</var> is supported.
 If not, return an error code equivalent to "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror②">NotSupportedError</a></code>" and terminate the operation.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①⑦">For each</a> <var>descriptor</var> of <var>excludeCredentialDescriptorList</var>:</p>
+     <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①⑧">For each</a> <var>descriptor</var> of <var>excludeCredentialDescriptorList</var>:</p>
      <ol>
       <li data-md>
        <p>If <a data-link-type="dfn" href="#credential-id-looking-up" id="ref-for-credential-id-looking-up">looking up</a> <code><var>descriptor</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-id" id="ref-for-dom-publickeycredentialdescriptor-id⑦">id</a></code></code> in this authenticator
-returns non-null, and the returned <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item⑨">item</a>'s <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③④">RP ID</a> and <a data-link-type="dfn" href="#public-key-credential-source-type" id="ref-for-public-key-credential-source-type①">type</a> match <code><var>rpEntity</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id①⓪">id</a></code></code> and <code><var>excludeCredentialDescriptorList</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-type" id="ref-for-dom-publickeycredentialdescriptor-type④">type</a></code></code> respectively,
+returns non-null, and the returned <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item⑨">item</a>'s <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⑦">RP ID</a> and <a data-link-type="dfn" href="#public-key-credential-source-type" id="ref-for-public-key-credential-source-type①">type</a> match <code><var>rpEntity</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id①①">id</a></code></code> and <code><var>excludeCredentialDescriptorList</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-type" id="ref-for-dom-publickeycredentialdescriptor-type④">type</a></code></code> respectively,
 then collect an <a data-link-type="dfn" href="#authorization-gesture" id="ref-for-authorization-gesture①⑥">authorization gesture</a> confirming <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent①⑥">user
 consent</a> for creating a new credential. The <a data-link-type="dfn" href="#authorization-gesture" id="ref-for-authorization-gesture①⑦">authorization gesture</a> MUST include a <a data-link-type="dfn" href="#test-of-user-presence" id="ref-for-test-of-user-presence⑧">test
 of user presence</a>. If the user</p>
@@ -5176,7 +5297,7 @@ <h4 class="heading settled" data-level="6.3.2" id="sctn-op-make-cred"><span clas
        </dl>
        <p class="note" role="note"><span class="marker">Note:</span> The purpose of this <a data-link-type="dfn" href="#authorization-gesture" id="ref-for-authorization-gesture①⑧">authorization gesture</a> is not to proceed with creating a credential,
 but for privacy reasons to authorize disclosure of the fact that <code><var>descriptor</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-id" id="ref-for-dom-publickeycredentialdescriptor-id⑧">id</a></code></code> is <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential①③">bound</a> to this <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧⑦">authenticator</a>.
-If the user consents, the <a data-link-type="dfn" href="#client" id="ref-for-client⑧②">client</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②①">Relying Party</a> can detect this and guide the user to use a different <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧⑧">authenticator</a>.
+If the user consents, the <a data-link-type="dfn" href="#client" id="ref-for-client⑧④">client</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②③">Relying Party</a> can detect this and guide the user to use a different <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧⑧">authenticator</a>.
 If the user does not consent,
 the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧⑨">authenticator</a> does not reveal that <code><var>descriptor</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-id" id="ref-for-dom-publickeycredentialdescriptor-id⑨">id</a></code></code> is <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential①④">bound</a> to it,
 and responds as if the user simply declined consent to create a credential.</p>
@@ -5190,7 +5311,7 @@ <h4 class="heading settled" data-level="6.3.2" id="sctn-op-make-cred"><span clas
     <li id="op-makecred-step-user-consent">
      <a class="self-link" href="#op-makecred-step-user-consent"></a> Collect an <a data-link-type="dfn" href="#authorization-gesture" id="ref-for-authorization-gesture①⑨">authorization gesture</a> confirming <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent①⑦">user consent</a> for creating a new credential.
     The prompt for the <a data-link-type="dfn" href="#authorization-gesture" id="ref-for-authorization-gesture②⓪">authorization gesture</a> is shown by the
-    authenticator if it has its own output capability, or by the user agent otherwise. The prompt SHOULD display <code><var>rpEntity</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id①①">id</a></code></code>, <code><var>rpEntity</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name①②">name</a></code></code>, <code><var>userEntity</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name①③">name</a></code></code> and <code><var>userEntity</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname①⓪">displayName</a></code></code>, if possible. 
+    authenticator if it has its own output capability, or by the user agent otherwise. The prompt SHOULD display <code><var>rpEntity</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id①②">id</a></code></code>, <code><var>rpEntity</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name①②">name</a></code></code>, <code><var>userEntity</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name①③">name</a></code></code> and <code><var>userEntity</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname①⓪">displayName</a></code></code>, if possible. 
      <p>If <var>requireUserVerification</var> is <code>true</code>, the <a data-link-type="dfn" href="#authorization-gesture" id="ref-for-authorization-gesture②①">authorization gesture</a> MUST include <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④②">user verification</a>.</p>
      <p>If <var>requireUserPresence</var> is <code>true</code>, the <a data-link-type="dfn" href="#authorization-gesture" id="ref-for-authorization-gesture②②">authorization gesture</a> MUST include a <a data-link-type="dfn" href="#test-of-user-presence" id="ref-for-test-of-user-presence⑨">test of user presence</a>.</p>
      <p>If the user does not <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent①⑧">consent</a> or if <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④③">user verification</a> fails, return an error code equivalent to
@@ -5214,7 +5335,7 @@ <h4 class="heading settled" data-level="6.3.2" id="sctn-op-make-cred"><span clas
          <p><var>privateKey</var></p>
         <dt data-md><a data-link-type="dfn" href="#public-key-credential-source-rpid" id="ref-for-public-key-credential-source-rpid②">rpId</a>
         <dd data-md>
-         <p><code><var>rpEntity</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id①②">id</a></code></code></p>
+         <p><code><var>rpEntity</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id①③">id</a></code></code></p>
         <dt data-md><a data-link-type="dfn" href="#public-key-credential-source-userhandle" id="ref-for-public-key-credential-source-userhandle①">userHandle</a>
         <dd data-md>
          <p><var>userHandle</var></p>
@@ -5232,7 +5353,7 @@ <h4 class="heading settled" data-level="6.3.2" id="sctn-op-make-cred"><span clas
         <li data-md>
          <p>Let <var>credentials</var> be this authenticator’s <a data-link-type="dfn" href="#authenticator-credentials-map" id="ref-for-authenticator-credentials-map②">credentials map</a>.</p>
         <li data-md>
-         <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-set" id="ref-for-map-set⑤">Set</a> <var>credentials</var>[(<code><var>rpEntity</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id①③">id</a></code></code>, <var>userHandle</var>)] to <var>credentialSource</var>.</p>
+         <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-set" id="ref-for-map-set⑤">Set</a> <var>credentials</var>[(<code><var>rpEntity</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id①④">id</a></code></code>, <var>userHandle</var>)] to <var>credentialSource</var>.</p>
        </ol>
       <li data-md>
        <p>Otherwise:</p>
@@ -5280,13 +5401,13 @@ <h4 class="heading settled" data-level="6.3.3" id="sctn-op-get-assertion"><span
    <dl>
     <dt data-md><var>rpId</var>
     <dd data-md>
-     <p>The caller’s <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⑤">RP ID</a>, as <a href="#GetAssn-DetermineRpId">determined</a> by the user agent and the client.</p>
+     <p>The caller’s <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⑧">RP ID</a>, as <a href="#GetAssn-DetermineRpId">determined</a> by the user agent and the client.</p>
     <dt data-md><var>hash</var>
     <dd data-md>
      <p>The <a data-link-type="dfn" href="#collectedclientdata-hash-of-the-serialized-client-data" id="ref-for-collectedclientdata-hash-of-the-serialized-client-data①⓪">hash of the serialized client data</a>, provided by the client.</p>
     <dt data-md><var>allowCredentialDescriptorList</var>
     <dd data-md>
-     <p>An OPTIONAL <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list⑤">list</a> of <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor①③">PublicKeyCredentialDescriptor</a></code>s describing credentials acceptable to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②②">Relying Party</a> (possibly filtered
+     <p>An OPTIONAL <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list⑤">list</a> of <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor①③">PublicKeyCredentialDescriptor</a></code>s describing credentials acceptable to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②④">Relying Party</a> (possibly filtered
 by the client), if any.</p>
     <dt data-md><var>requireUserPresence</var>
     <dd data-md>
@@ -5299,7 +5420,7 @@ <h4 class="heading settled" data-level="6.3.3" id="sctn-op-get-assertion"><span
     <dt data-md><var>extensions</var>
     <dd data-md>
      <p>A <a data-link-type="dfn" href="#cbor" id="ref-for-cbor①⓪">CBOR</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map①①">map</a> from <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier⑧">extension identifiers</a> to their <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input③">authenticator extension inputs</a>, created by the client based on
-the extensions requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②③">Relying Party</a>, if any.</p>
+the extensions requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑤">Relying Party</a>, if any.</p>
    </dl>
    <p class="note" role="note"><span class="marker">Note:</span> Before performing this operation, all other operations in progress in the <a data-link-type="dfn" href="#authenticator-session" id="ref-for-authenticator-session③">authenticator session</a> MUST be aborted by running the <a data-link-type="dfn" href="#authenticatorcancel" id="ref-for-authenticatorcancel①②">authenticatorCancel</a> operation.</p>
    <p>When this method is invoked, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨①">authenticator</a> MUST perform the following procedure:</p>
@@ -5308,19 +5429,19 @@ <h4 class="heading settled" data-level="6.3.3" id="sctn-op-get-assertion"><span
      <p>Check if all the supplied parameters are syntactically well-formed and of the correct length. If not, return an error code
 equivalent to "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#unknownerror" id="ref-for-unknownerror②">UnknownError</a></code>" and terminate the operation.</p>
     <li data-md>
-     <p>Let <var>credentialOptions</var> be a new empty <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set⑥">set</a> of <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑥④">public key credential sources</a>.</p>
+     <p>Let <var>credentialOptions</var> be a new empty <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set⑦">set</a> of <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑥④">public key credential sources</a>.</p>
     <li data-md>
-     <p>If <var>allowCredentialDescriptorList</var> was supplied, then <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①⑧">for each</a> <var>descriptor</var> of <var>allowCredentialDescriptorList</var>:</p>
+     <p>If <var>allowCredentialDescriptorList</var> was supplied, then <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①⑨">for each</a> <var>descriptor</var> of <var>allowCredentialDescriptorList</var>:</p>
      <ol>
       <li data-md>
        <p>Let <var>credSource</var> be the result of <a data-link-type="dfn" href="#credential-id-looking-up" id="ref-for-credential-id-looking-up①">looking up</a> <code><var>descriptor</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-id" id="ref-for-dom-publickeycredentialdescriptor-id①⓪">id</a></code></code> in this
 authenticator.</p>
       <li data-md>
-       <p>If <var>credSource</var> is not <code>null</code>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append④">append</a> it to <var>credentialOptions</var>.</p>
+       <p>If <var>credSource</var> is not <code>null</code>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append⑤">append</a> it to <var>credentialOptions</var>.</p>
      </ol>
     <li data-md>
      <p>Otherwise (<var>allowCredentialDescriptorList</var> was not supplied), <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-iterate" id="ref-for-map-iterate④">for each</a> <var>key</var> → <var>credSource</var> of this
-authenticator’s <a data-link-type="dfn" href="#authenticator-credentials-map" id="ref-for-authenticator-credentials-map③">credentials map</a>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append⑤">append</a> <var>credSource</var> to <var>credentialOptions</var>.</p>
+authenticator’s <a data-link-type="dfn" href="#authenticator-credentials-map" id="ref-for-authenticator-credentials-map③">credentials map</a>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append⑥">append</a> <var>credSource</var> to <var>credentialOptions</var>.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-remove" id="ref-for-list-remove②⓪">Remove</a> any items from <var>credentialOptions</var> whose <a data-link-type="dfn" href="#public-key-credential-source-rpid" id="ref-for-public-key-credential-source-rpid③">rpId</a> is not equal to <var>rpId</var>.</p>
     <li data-md>
@@ -5375,7 +5496,7 @@ <h4 class="heading settled" data-level="6.3.3" id="sctn-op-get-assertion"><span
        <p class="note" role="note"><span class="marker">Note:</span> In cases where <var>allowCredentialDescriptorList</var> was supplied the returned <a data-link-type="dfn" href="#public-key-credential-source-userhandle" id="ref-for-public-key-credential-source-userhandle③">userHandle</a> value may be <code>null</code>, see: <a data-link-type="dfn" href="#assertioncreationdata-userhandleresult" id="ref-for-assertioncreationdata-userhandleresult⑤">userHandleResult</a>.</p>
      </ul>
    </ol>
-   <p>If the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨⑤">authenticator</a> cannot find any <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential④⑧">credential</a> corresponding to the specified <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②④">Relying Party</a> that
+   <p>If the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨⑤">authenticator</a> cannot find any <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential④⑧">credential</a> corresponding to the specified <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑥">Relying Party</a> that
 matches the specified criteria, it terminates the operation and returns an error.</p>
    <h4 class="heading settled" data-level="6.3.4" id="sctn-op-cancel"><span class="secno">6.3.4. </span><span class="content">The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticatorcancel">authenticatorCancel</dfn> Operation</span><a class="self-link" href="#sctn-op-cancel"></a></h4>
    <p>This operation takes no input parameters and returns no result.</p>
@@ -5384,12 +5505,12 @@ <h4 class="heading settled" data-level="6.3.4" id="sctn-op-cancel"><span class="
 client ignores any further responses from the authenticator for the canceled operation.</p>
    <p>This operation is ignored if it is invoked in an <a data-link-type="dfn" href="#authenticator-session" id="ref-for-authenticator-session⑤">authenticator session</a> which does not have an <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential①⑤">authenticatorMakeCredential</a> or <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①⑤">authenticatorGetAssertion</a> operation currently in progress.</p>
    <h4 class="heading settled" data-level="6.3.5" id="sctn-op-silent-discovery"><span class="secno">6.3.5. </span><span class="content">The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="silentcredentialdiscovery">silentCredentialDiscovery</dfn> operation</span><a class="self-link" href="#sctn-op-silent-discovery"></a></h4>
-   <p>This is an OPTIONAL operation authenticators MAY support to enable <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional②⑤">conditional</a></code> <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#user-mediated" id="ref-for-user-mediated⑦">user mediation</a>.</p>
+   <p>This is an OPTIONAL operation authenticators MAY support to enable <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional②④">conditional</a></code> <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#user-mediated" id="ref-for-user-mediated⑥">user mediation</a>.</p>
    <p>It takes the following input parameter:</p>
    <dl>
     <dt data-md><var>rpId</var>
     <dd data-md>
-     <p>The caller’s <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⑥">RP ID</a>, as <a href="#GetAssn-DetermineRpId">determined</a> by the <a data-link-type="dfn" href="#client" id="ref-for-client⑧③">client</a>.</p>
+     <p>The caller’s <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⑨">RP ID</a>, as <a href="#GetAssn-DetermineRpId">determined</a> by the <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑤">client</a>.</p>
    </dl>
    <p>When this operation is invoked, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨⑥">authenticator</a> MUST perform the following procedure:</p>
    <ol>
@@ -5416,9 +5537,9 @@ <h4 class="heading settled" data-level="6.3.5" id="sctn-op-silent-discovery"><sp
      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-iterate" id="ref-for-map-iterate⑥">For each</a> <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑥⑥">public key credential source</a> <var>credSource</var> of <var>authenticator</var>’s <a data-link-type="dfn" href="#authenticator-credentials-map" id="ref-for-authenticator-credentials-map④">credentials map</a>:</p>
      <ol>
       <li data-md>
-       <p>If <var>credSource</var> is not a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①④">client-side discoverable credential</a>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue①⑦">continue</a>.</p>
+       <p>If <var>credSource</var> is not a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①④">client-side discoverable credential</a>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue②①">continue</a>.</p>
       <li data-md>
-       <p>If <var>credSource</var>.<a data-link-type="dfn" href="#public-key-credential-source-rpid" id="ref-for-public-key-credential-source-rpid④">rpId</a> is not <var>rpId</var>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue①⑧">continue</a>.</p>
+       <p>If <var>credSource</var>.<a data-link-type="dfn" href="#public-key-credential-source-rpid" id="ref-for-public-key-credential-source-rpid④">rpId</a> is not <var>rpId</var>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue②②">continue</a>.</p>
       <li data-md>
        <p>Let <var>discoveredCredentialMetadata</var> be a new <a data-link-type="dfn" href="#discoverablecredentialmetadata" id="ref-for-discoverablecredentialmetadata②">DiscoverableCredentialMetadata</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#struct" id="ref-for-struct⑤">struct</a> whose <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#struct-item" id="ref-for-struct-item①①">items</a> are copies of <var>credSource</var>’s <a data-link-type="dfn" href="#public-key-credential-source-type" id="ref-for-public-key-credential-source-type③">type</a>, <a data-link-type="dfn" href="#public-key-credential-source-id" id="ref-for-public-key-credential-source-id④">id</a>, <a data-link-type="dfn" href="#public-key-credential-source-rpid" id="ref-for-public-key-credential-source-rpid⑤">rpId</a>, <a data-link-type="dfn" href="#public-key-credential-source-userhandle" id="ref-for-public-key-credential-source-userhandle④">userHandle</a> and <a data-link-type="dfn" href="#public-key-credential-source-otherui" id="ref-for-public-key-credential-source-otherui③">otherUI</a>.</p>
       <li data-md>
@@ -5428,7 +5549,7 @@ <h4 class="heading settled" data-level="6.3.5" id="sctn-op-silent-discovery"><sp
      <p>Return <var>collectedDiscoverableCredentialMetadata</var>.</p>
    </ol>
    <h3 class="heading settled" data-level="6.4" id="sctn-strings"><span class="secno">6.4. </span><span class="content">String Handling</span><a class="self-link" href="#sctn-strings"></a></h3>
-   <p>Authenticators may be required to store arbitrary strings chosen by a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑤">Relying Party</a>, for example the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name①④">name</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname①①">displayName</a></code> in a <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialuserentity" id="ref-for-dictdef-publickeycredentialuserentity⑥">PublicKeyCredentialUserEntity</a></code>. This section discusses some practical consequences of handling arbitrary strings that may be presented to humans.</p>
+   <p>Authenticators may be required to store arbitrary strings chosen by a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑦">Relying Party</a>, for example the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name①④">name</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname①①">displayName</a></code> in a <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialuserentity" id="ref-for-dictdef-publickeycredentialuserentity⑥">PublicKeyCredentialUserEntity</a></code>. This section discusses some practical consequences of handling arbitrary strings that may be presented to humans.</p>
    <h4 class="heading settled" data-level="6.4.1" id="sctn-strings-truncation"><span class="secno">6.4.1. </span><span class="content">String Truncation</span><a class="self-link" href="#sctn-strings-truncation"></a></h4>
    <p>Each arbitrary string in the API will have some accommodation for the potentially limited resources available to an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨⑧">authenticator</a>.
 When the chosen accommodation is string truncation, care needs to be taken to not corrupt the string value.</p>
@@ -5443,13 +5564,13 @@ <h4 class="heading settled" data-level="6.4.1" id="sctn-strings-truncation"><spa
      <img src="images/string-truncation.svg"> 
     <figcaption>The end of a UTF-8 encoded string showing the positions of different truncation boundaries.</figcaption>
    </figure>
-   <p>The responsibility for handling these concerns falls primarily on the <a data-link-type="dfn" href="#client" id="ref-for-client⑧④">client</a>,
+   <p>The responsibility for handling these concerns falls primarily on the <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑥">client</a>,
 to avoid burdening <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨⑨">authenticators</a> with understanding character encodings and Unicode character properties.
 The following subsections define requirements for how clients and authenticators,
 respectively, may perform string truncation.</p>
    <h5 class="heading settled" data-level="6.4.1.1" id="sctn-strings-truncation-client"><span class="secno">6.4.1.1. </span><span class="content">String Truncation by Clients</span><a class="self-link" href="#sctn-strings-truncation-client"></a></h5>
-   <p>When a <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client①③">WebAuthn Client</a> truncates a string,
-the truncation behaviour observable by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑥">Relying Party</a> MUST satisfy the following requirements:</p>
+   <p>When a <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client①⑦">WebAuthn Client</a> truncates a string,
+the truncation behaviour observable by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑧">Relying Party</a> MUST satisfy the following requirements:</p>
    <p>Choose a size limit equal to or greater than the specified minimum supported length.
 The string MAY be truncated so that its length in bytes in the UTF-8 character encoding satisfies that limit.
 This truncation MUST respect UTF-8 code point boundaries, and SHOULD respect <a data-link-type="dfn" href="https://w3c.github.io/i18n-glossary/#dfn-grapheme-cluster" id="ref-for-dfn-grapheme-cluster②">grapheme cluster</a> boundaries <a data-link-type="biblio" href="#biblio-uax29" title="UNICODE Text Segmentation">[UAX29]</a>.
@@ -5466,7 +5587,7 @@ <h5 class="heading settled" data-level="6.4.1.1" id="sctn-strings-truncation-cli
    </ol>
    <h5 class="heading settled" data-level="6.4.1.2" id="sctn-strings-truncation-authenticator"><span class="secno">6.4.1.2. </span><span class="content">String Truncation by Authenticators</span><a class="self-link" href="#sctn-strings-truncation-authenticator"></a></h5>
    <p>Because a <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator⑦">WebAuthn Authenticator</a> may be implemented in a constrained environment,
-the requirements on authenticators are relaxed compared to those for <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑤">clients</a>.</p>
+the requirements on authenticators are relaxed compared to those for <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑦">clients</a>.</p>
    <p>When a <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator⑧">WebAuthn Authenticator</a> truncates a string,
 the truncation behaviour MUST satisfy the following requirements:</p>
    <p>Choose a size limit equal to or greater than the specified minimum supported length.
@@ -5490,14 +5611,14 @@ <h4 class="heading settled" data-level="6.4.2" id="sctn-strings-langdir"><span c
    <h3 class="heading settled" data-level="6.5" id="sctn-attestation"><span class="secno">6.5. </span><span class="content">Attestation</span><a class="self-link" href="#sctn-attestation"></a></h3>
    <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⓪③">Authenticators</a> SHOULD also provide some form of <a data-link-type="dfn" href="#attestation" id="ref-for-attestation①⑦">attestation</a>, if possible.
 If an authenticator does, the basic requirement is that the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⓪④">authenticator</a> can
-produce, for each <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②④">credential public key</a>, an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⑨">attestation statement</a> verifiable by the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⓪">WebAuthn Relying Party</a>. Typically, this <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement②⓪">attestation statement</a> contains a signature by an <a data-link-type="dfn" href="#attestation-private-key" id="ref-for-attestation-private-key①">attestation private key</a> over the attested <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②⑤">credential public key</a> and
+produce, for each <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②④">credential public key</a>, an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⑨">attestation statement</a> verifiable by the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③①">WebAuthn Relying Party</a>. Typically, this <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement②⓪">attestation statement</a> contains a signature by an <a data-link-type="dfn" href="#attestation-private-key" id="ref-for-attestation-private-key①">attestation private key</a> over the attested <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②⑤">credential public key</a> and
 a challenge, as well as a certificate or similar data providing provenance information for the <a data-link-type="dfn" href="#attestation-public-key" id="ref-for-attestation-public-key">attestation public key</a>,
-enabling the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑦">Relying Party</a> to make a trust decision. However, if an <a data-link-type="dfn" href="#attestation-key-pair" id="ref-for-attestation-key-pair②">attestation key pair</a> is not available, then the authenticator
+enabling the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑨">Relying Party</a> to make a trust decision. However, if an <a data-link-type="dfn" href="#attestation-key-pair" id="ref-for-attestation-key-pair②">attestation key pair</a> is not available, then the authenticator
 MAY either perform <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation⑦">self attestation</a> of the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②⑥">credential public key</a> with the corresponding <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①②">credential private key</a>,
 or otherwise perform <a data-link-type="dfn" href="#none" id="ref-for-none①">no attestation</a>. All this information is returned by <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⓪⑤">authenticators</a> any time a new <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential④⑨">public key credential</a> is generated, in the overall form of an <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="attestation-object">attestation object</dfn>. The relationship of the <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①⓪">attestation object</a> with <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data③⑨">authenticator data</a> (containing <a data-link-type="dfn" href="#attested-credential-data" id="ref-for-attested-credential-data⑨">attested credential data</a>) and the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement②①">attestation statement</a> is illustrated in <a href="#fig-attStructs">figure <span class="figure-num-following"></span></a>, below.</p>
    <p>If an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⓪⑥">authenticator</a> employs <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation⑧">self attestation</a> or <a data-link-type="dfn" href="#none" id="ref-for-none②">no attestation</a>, then no provenance information is provided
-for the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑧">Relying Party</a> to base a trust decision on.
-In these cases, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⓪⑦">authenticator</a> provides no guarantees about its operation to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑨">Relying Party</a>.</p>
+for the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⓪">Relying Party</a> to base a trust decision on.
+In these cases, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⓪⑦">authenticator</a> provides no guarantees about its operation to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③①">Relying Party</a>.</p>
    <figure id="fig-attStructs">
      <img src="images/fido-attestation-structures.svg"> 
     <figcaption><a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①①">Attestation object</a> layout illustrating the included <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data④⓪">authenticator data</a> (containing <a data-link-type="dfn" href="#attested-credential-data" id="ref-for-attested-credential-data①⓪">attested credential
@@ -5509,7 +5630,7 @@ <h3 class="heading settled" data-level="6.5" id="sctn-attestation"><span class="
 data object, containing statements about a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤⓪">public key credential</a> itself and the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⓪⑧">authenticator</a> that created it. It
 contains an <a data-link-type="dfn" href="#attestation-signature" id="ref-for-attestation-signature⑦">attestation signature</a> created using the key of the attesting authority (except for the case of <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation⑨">self
 attestation</a>, when it is created using the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①③">credential private key</a>). In order to correctly interpret an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement②③">attestation
-statement</a>, a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⓪">Relying Party</a> needs to understand these two aspects of <a data-link-type="dfn" href="#attestation" id="ref-for-attestation①⑧">attestation</a>:</p>
+statement</a>, a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③②">Relying Party</a> needs to understand these two aspects of <a data-link-type="dfn" href="#attestation" id="ref-for-attestation①⑧">attestation</a>:</p>
    <ol>
     <li data-md>
      <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="attestation-statement-format">attestation statement format</dfn> is the manner in which the signature is represented and the various contextual
@@ -5517,7 +5638,7 @@ <h3 class="heading settled" data-level="6.5" id="sctn-attestation"><span class="
 syntax of the statement. Various existing components and OS platforms (such as TPMs and the Android OS) have previously defined <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format④">attestation statement formats</a>. This specification supports a variety of such formats in an extensible way, as defined in <a href="#sctn-attestation-formats">§ 6.5.2 Attestation Statement Formats</a>. The formats themselves are identified by strings, as described in <a href="#sctn-attstn-fmt-ids">§ 8.1 Attestation Statement Format Identifiers</a>.</p>
     <li data-md>
      <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="attestation-type">attestation type</dfn> defines the semantics of <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement②④">attestation statements</a> and their underlying trust models.
-Specifically, it defines how a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③①">Relying Party</a> establishes trust in a particular <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement②⑤">attestation statement</a>, after verifying that it
+Specifically, it defines how a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③③">Relying Party</a> establishes trust in a particular <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement②⑤">attestation statement</a>, after verifying that it
 is cryptographically valid. This specification supports a number of <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type">attestation types</a>, as described in <a href="#sctn-attestation-types">§ 6.5.3 Attestation Types</a>.</p>
    </ol>
    <p>In general, there is no simple mapping between <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format⑤">attestation statement formats</a> and <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①">attestation types</a>. For example, the
@@ -5534,9 +5655,9 @@ <h3 class="heading settled" data-level="6.5" id="sctn-attestation"><span class="
      <p>The characteristics of the individual <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①⓪">authenticator</a>, such as its construction, whether part or all of it runs in a secure
 operating environment, and so on.</p>
    </ul>
-   <p>The <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type④">attestation type</a> and <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format⑧">attestation statement format</a> is chosen by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①①">authenticator</a>; <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③②">Relying Parties</a> can only signal their preferences by setting the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-attestation" id="ref-for-dom-publickeycredentialcreationoptions-attestation④">attestation</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-attestationformats" id="ref-for-dom-publickeycredentialcreationoptions-attestationformats②">attestationFormats</a></code> parameters.</p>
+   <p>The <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type④">attestation type</a> and <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format⑧">attestation statement format</a> is chosen by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①①">authenticator</a>; <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③④">Relying Parties</a> can only signal their preferences by setting the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-attestation" id="ref-for-dom-publickeycredentialcreationoptions-attestation④">attestation</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-attestationformats" id="ref-for-dom-publickeycredentialcreationoptions-attestationformats②">attestationFormats</a></code> parameters.</p>
    <p>It is expected that most <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①②">authenticators</a> will support a small number of <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type⑤">attestation types</a> and <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format⑨">attestation statement
-formats</a>, while <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③③">Relying Parties</a> will decide what <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type⑥">attestation types</a> are acceptable to them by policy. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③④">Relying Parties</a> will also need to
+formats</a>, while <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑤">Relying Parties</a> will decide what <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type⑥">attestation types</a> are acceptable to them by policy. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑥">Relying Parties</a> will also need to
 understand the characteristics of the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①③">authenticators</a> that they trust, based on information they have about these <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①④">authenticators</a>. For example, the FIDO Metadata Service <a data-link-type="biblio" href="#biblio-fidometadataservice" title="FIDO Metadata Service">[FIDOMetadataService]</a> provides one way to access such information.</p>
    <h4 class="heading settled" data-level="6.5.1" id="sctn-attested-credential-data"><span class="secno">6.5.1. </span><span class="content">Attested Credential Data</span><a class="self-link" href="#sctn-attested-credential-data"></a></h4>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="attested-credential-data">Attested credential data</dfn> is a variable-length byte array added to the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data④①">authenticator data</a> when generating an <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①③">attestation
@@ -5566,7 +5687,7 @@ <h4 class="heading settled" data-level="6.5.1" id="sctn-attested-credential-data
        <td> The <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②⑦">credential public key</a> encoded in COSE_Key format,
                 as defined in <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc9052#section-7" id="ref-for-section-7①">Section 7</a> of <a data-link-type="biblio" href="#biblio-rfc9052" title="CBOR Object Signing and Encryption (COSE): Structures and Process">[RFC9052]</a>, using the <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.1-ps-20210615/fido-client-to-authenticator-protocol-v2.1-ps-errata-20220621.html#ctap2-canonical-cbor-encoding-form" id="ref-for-ctap2-canonical-cbor-encoding-form③">CTAP2 canonical CBOR encoding form</a>.
                 The COSE_Key-encoded <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②⑧">credential public key</a> MUST contain the "alg" parameter and MUST NOT
-                contain any other OPTIONAL parameters. The "alg" parameter MUST contain a <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier①②">COSEAlgorithmIdentifier</a></code> value.
+                contain any other OPTIONAL parameters. The "alg" parameter MUST contain a <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier①③">COSEAlgorithmIdentifier</a></code> value.
                 The encoded <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②⑨">credential public key</a> MUST also contain any additional REQUIRED parameters stipulated by the
                 relevant key type specification, i.e., REQUIRED for the key type "kty" and algorithm "alg"
                 (see <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc9053#section-2" id="ref-for-section-2">Section 2</a> of <a data-link-type="biblio" href="#biblio-rfc9053" title="CBOR Object Signing and Encryption (COSE): Initial Algorithms">[RFC9053]</a>). 
@@ -5668,12 +5789,12 @@ <h4 class="heading settled" data-level="6.5.2" id="sctn-attestation-formats"><sp
    <h4 class="heading settled" data-level="6.5.3" id="sctn-attestation-types"><span class="secno">6.5.3. </span><span class="content">Attestation Types</span><a class="self-link" href="#sctn-attestation-types"></a></h4>
    <p>WebAuthn supports several <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type⑨">attestation types</a>, defining the semantics of <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③①">attestation statements</a> and their underlying trust
 models:</p>
-   <p class="note" role="note"><span class="marker">Note:</span> This specification does not define any data structures explicitly expressing the <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①⓪">attestation types</a> employed by <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①⑥">authenticators</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑤">Relying Parties</a> engaging in <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③②">attestation statement</a> <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure">verification</a> — i.e., when
+   <p class="note" role="note"><span class="marker">Note:</span> This specification does not define any data structures explicitly expressing the <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①⓪">attestation types</a> employed by <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①⑥">authenticators</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑦">Relying Parties</a> engaging in <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③②">attestation statement</a> <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure">verification</a> — i.e., when
 calling <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⑥">navigator.credentials.create()</a></code> they select an <a data-link-type="dfn" href="#attestation-conveyance" id="ref-for-attestation-conveyance③">attestation conveyance</a> other than <code class="idl"><a data-link-type="idl" href="#dom-attestationconveyancepreference-none" id="ref-for-dom-attestationconveyancepreference-none④">none</a></code> and verify the received <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③③">attestation statement</a> — will determine the employed <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①①">attestation type</a> as a part of <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure①">verification</a>. See the "Verification procedure" subsections of <a href="#sctn-defined-attestation-formats">§ 8 Defined Attestation Statement Formats</a>. See also <a href="#sctn-attestation-privacy">§ 14.4.1 Attestation Privacy</a>. For all <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①②">attestation types</a> defined in this
-section other than <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①①">Self</a> and <a data-link-type="dfn" href="#none" id="ref-for-none③">None</a>, <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑥">Relying Party</a> <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure②">verification</a> is followed by
+section other than <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①①">Self</a> and <a data-link-type="dfn" href="#none" id="ref-for-none③">None</a>, <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑧">Relying Party</a> <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure②">verification</a> is followed by
 matching the <a data-link-type="dfn" href="#attestation-trust-path" id="ref-for-attestation-trust-path①">trust path</a> to an acceptable root certificate per <a href="#reg-ceremony-assess-trust">step 24</a> of <a href="#sctn-registering-a-new-credential">§ 7.1 Registering a New Credential</a>.
 Differentiating these <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①③">attestation types</a> becomes useful primarily as a means for determining if the <a data-link-type="dfn" href="#attestation" id="ref-for-attestation②①">attestation</a> is acceptable
-under <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑦">Relying Party</a> policy.</p>
+under <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑨">Relying Party</a> policy.</p>
    <dl>
     <dt data-md><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="basic-attestation">Basic Attestation</dfn> (<dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="basic">Basic</dfn>)
     <dd data-md>
@@ -5691,12 +5812,12 @@ <h4 class="heading settled" data-level="6.5.3" id="sctn-attestation-types"><span
 "endorsement key" (EK). This key is used to securely communicate with a trusted third party, the <a data-link-type="dfn" href="#attestation-ca" id="ref-for-attestation-ca①">Attestation CA</a> <a data-link-type="biblio" href="#biblio-tcg-cmcprofile-aikcertenroll" title="TCG Infrastructure Working Group: A CMC Profile for AIK Certificate Enrollment">[TCG-CMCProfile-AIKCertEnroll]</a> (formerly known as a "Privacy CA"). The <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①⑧">authenticator</a> can generate multiple
 attestation identity key pairs (AIK) and requests an <a data-link-type="dfn" href="#attestation-ca" id="ref-for-attestation-ca②">Attestation CA</a> to issue an AIK certificate
 for each. Using this approach, such an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①⑨">authenticator</a> can limit the exposure of the EK (which is a global correlation
-handle) to Attestation CA(s). AIKs can be requested for each <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⓪">authenticator</a>-generated <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤②">public key credential</a> individually, and conveyed to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑧">Relying Parties</a> as <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate③">attestation certificates</a>.</p>
+handle) to Attestation CA(s). AIKs can be requested for each <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⓪">authenticator</a>-generated <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤②">public key credential</a> individually, and conveyed to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⓪">Relying Parties</a> as <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate③">attestation certificates</a>.</p>
      <p class="note" role="note"><span class="marker">Note:</span> This concept typically leads to multiple attestation certificates. The attestation certificate requested most recently
     is called "active".</p>
     <dt data-md><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="anonymization-ca">Anonymization CA</dfn> (<dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="anonca">AnonCA</dfn>)
     <dd data-md>
-     <p>In this case, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②①">authenticator</a> uses an <a data-link-type="dfn" href="#anonymization-ca" id="ref-for-anonymization-ca③">Anonymization CA</a> which dynamically generates per-<a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⑦">credential</a> <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate④">attestation certificates</a> such that the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③④">attestation statements</a> presented to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑨">Relying Parties</a> do not provide uniquely identifiable information, e.g., that might be used for tracking purposes.</p>
+     <p>In this case, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②①">authenticator</a> uses an <a data-link-type="dfn" href="#anonymization-ca" id="ref-for-anonymization-ca③">Anonymization CA</a> which dynamically generates per-<a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⑦">credential</a> <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate④">attestation certificates</a> such that the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③④">attestation statements</a> presented to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④①">Relying Parties</a> do not provide uniquely identifiable information, e.g., that might be used for tracking purposes.</p>
      <p class="note" role="note"><span class="marker">Note:</span> <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③⑤">Attestation statements</a> conveying <a data-link-type="dfn" href="#attestation" id="ref-for-attestation②②">attestations</a> of <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①④">type</a> <a data-link-type="dfn" href="#attca" id="ref-for-attca">AttCA</a> or <a data-link-type="dfn" href="#anonca" id="ref-for-anonca">AnonCA</a> use the same data structure
     as those of <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①⑤">type</a> <a data-link-type="dfn" href="#basic" id="ref-for-basic">Basic</a>, so the three attestation types
     are, in general, distinguishable only with externally provided knowledge regarding the contents of the <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate⑤">attestation
@@ -5770,18 +5891,18 @@ <h4 class="heading settled" data-level="6.5.5" id="sctn-signature-attestation-ty
 RSASSA-PSS signature scheme defined in Section 8.1.1 of <a data-link-type="biblio" href="#biblio-rfc8017" title="PKCS #1: RSA Cryptography Specifications Version 2.2">[RFC8017]</a> with SHA-256 as the hash function.
 The signature is not ASN.1 wrapped.</p>
    </ul>
-   <h2 class="heading settled" data-level="7" id="sctn-rp-operations"><span class="secno">7. </span><span class="content"><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③①">WebAuthn Relying Party</a> Operations</span><a class="self-link" href="#sctn-rp-operations"></a></h2>
-   <p>A <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⓪">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⑤">authentication ceremony</a> begins with the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③②">WebAuthn Relying Party</a> creating a <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions①①">PublicKeyCredentialCreationOptions</a></code> or <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions①①">PublicKeyCredentialRequestOptions</a></code> object, respectively, which encodes the parameters for the <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①②">ceremony</a>. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⓪">Relying Party</a> SHOULD take care to not leak sensitive information during this stage; see <a href="#sctn-username-enumeration">§ 14.6.2 Username Enumeration</a> for details.</p>
-   <p>Upon successful execution of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⑦">create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⓪">get()</a></code>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④①">Relying Party</a>'s script receives
-a <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②⑥">PublicKeyCredential</a></code> containing an <code class="idl"><a data-link-type="idl" href="#authenticatorattestationresponse" id="ref-for-authenticatorattestationresponse⑤">AuthenticatorAttestationResponse</a></code> or <code class="idl"><a data-link-type="idl" href="#authenticatorassertionresponse" id="ref-for-authenticatorassertionresponse⑥">AuthenticatorAssertionResponse</a></code> structure,
-respectively, from the client. It must then deliver the contents of this structure to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④②">Relying Party</a> server, using methods outside
-the scope of this specification. This section describes the operations that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④③">Relying Party</a> must perform upon receipt of these
+   <h2 class="heading settled" data-level="7" id="sctn-rp-operations"><span class="secno">7. </span><span class="content"><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③②">WebAuthn Relying Party</a> Operations</span><a class="self-link" href="#sctn-rp-operations"></a></h2>
+   <p>A <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⓪">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⑤">authentication ceremony</a> begins with the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③③">WebAuthn Relying Party</a> creating a <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions①①">PublicKeyCredentialCreationOptions</a></code> or <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions①①">PublicKeyCredentialRequestOptions</a></code> object, respectively, which encodes the parameters for the <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①②">ceremony</a>. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④②">Relying Party</a> SHOULD take care to not leak sensitive information during this stage; see <a href="#sctn-username-enumeration">§ 14.6.2 Username Enumeration</a> for details.</p>
+   <p>Upon successful execution of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⑦">create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⓪">get()</a></code>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④③">Relying Party</a>'s script receives
+a <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②⑦">PublicKeyCredential</a></code> containing an <code class="idl"><a data-link-type="idl" href="#authenticatorattestationresponse" id="ref-for-authenticatorattestationresponse⑤">AuthenticatorAttestationResponse</a></code> or <code class="idl"><a data-link-type="idl" href="#authenticatorassertionresponse" id="ref-for-authenticatorassertionresponse⑥">AuthenticatorAssertionResponse</a></code> structure,
+respectively, from the client. It must then deliver the contents of this structure to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④④">Relying Party</a> server, using methods outside
+the scope of this specification. This section describes the operations that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑤">Relying Party</a> must perform upon receipt of these
 structures.</p>
    <h3 class="heading settled" data-level="7.1" id="sctn-registering-a-new-credential"><span class="secno">7.1. </span><span class="content">Registering a New Credential</span><a class="self-link" href="#sctn-registering-a-new-credential"></a></h3>
-   <p>In order to perform a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①①">registration ceremony</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④④">Relying Party</a> MUST proceed as follows:</p>
+   <p>In order to perform a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①①">registration ceremony</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑥">Relying Party</a> MUST proceed as follows:</p>
    <ol>
     <li data-md>
-     <p>Let <var>options</var> be a new <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions①②">PublicKeyCredentialCreationOptions</a></code> structure configured to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑤">Relying Party</a>'s needs for the ceremony.</p>
+     <p>Let <var>options</var> be a new <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions①②">PublicKeyCredentialCreationOptions</a></code> structure configured to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑦">Relying Party</a>'s needs for the ceremony.</p>
     <li data-md>
      <p>Call <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⑧">navigator.credentials.create()</a></code> and pass <var>options</var> as the <code><code class="idl"><a data-link-type="idl" href="#dom-credentialcreationoptions-publickey" id="ref-for-dom-credentialcreationoptions-publickey④">publicKey</a></code></code> option.
 Let <var>credential</var> be the result of the successfully resolved promise.
@@ -5809,17 +5930,17 @@ <h3 class="heading settled" data-level="7.1" id="sctn-registering-a-new-credenti
     <li data-md>
      <p>Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-challenge" id="ref-for-dom-collectedclientdata-challenge⑥">challenge</a></code></code> equals
 the base64url encoding of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-challenge" id="ref-for-dom-publickeycredentialcreationoptions-challenge②">challenge</a></code></code>.</p>
-    <li id="rp-op-registering-a-new-credential-step-origin"><a class="self-link" href="#rp-op-registering-a-new-credential-step-origin"></a> Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin⑦">origin</a></code></code> is an <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①③">origin</a> expected by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑥">Relying Party</a>.
+    <li id="rp-op-registering-a-new-credential-step-origin"><a class="self-link" href="#rp-op-registering-a-new-credential-step-origin"></a> Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin⑦">origin</a></code></code> is an <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①④">origin</a> expected by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑧">Relying Party</a>.
   See <a href="#sctn-validating-origin">§ 13.4.9 Validating the origin of a credential</a> for guidance. 
     <li data-md>
      <p>If <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-toporigin" id="ref-for-dom-collectedclientdata-toporigin⑦">topOrigin</a></code></code> is present:</p>
      <ol>
       <li data-md>
-       <p>Verify that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑦">Relying Party</a> expects that this credential would have been created within an iframe that is
+       <p>Verify that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑨">Relying Party</a> expects that this credential would have been created within an iframe that is
 not <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#same-origin-with-its-ancestors" id="ref-for-same-origin-with-its-ancestors④">same-origin with its ancestors</a>.</p>
       <li data-md>
-       <p>Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-toporigin" id="ref-for-dom-collectedclientdata-toporigin⑧">topOrigin</a></code></code> matches the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①④">origin</a> of a page
-that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑧">Relying Party</a> expects to be sub-framed within.
+       <p>Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-toporigin" id="ref-for-dom-collectedclientdata-toporigin⑧">topOrigin</a></code></code> matches the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①⑤">origin</a> of a page
+that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⓪">Relying Party</a> expects to be sub-framed within.
 See <a href="#sctn-validating-origin">§ 13.4.9 Validating the origin of a credential</a> for guidance.</p>
      </ol>
     <li data-md>
@@ -5827,29 +5948,29 @@ <h3 class="heading settled" data-level="7.1" id="sctn-registering-a-new-credenti
     <li data-md>
      <p>Perform CBOR decoding on the <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-attestationobject" id="ref-for-dom-authenticatorattestationresponse-attestationobject⑦">attestationObject</a></code> field of the <code class="idl"><a data-link-type="idl" href="#authenticatorattestationresponse" id="ref-for-authenticatorattestationresponse⑦">AuthenticatorAttestationResponse</a></code> structure to obtain the attestation statement format <var>fmt</var>, the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data④⑤">authenticator data</a> <var>authData</var>, and the attestation statement <var>attStmt</var>.</p>
     <li data-md>
-     <p>Verify that the <code><a data-link-type="dfn" href="#authdata-rpidhash" id="ref-for-authdata-rpidhash②">rpIdHash</a></code> in <var>authData</var> is the SHA-256 hash of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⑦">RP ID</a> expected by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑨">Relying Party</a>.</p>
+     <p>Verify that the <code><a data-link-type="dfn" href="#authdata-rpidhash" id="ref-for-authdata-rpidhash②">rpIdHash</a></code> in <var>authData</var> is the SHA-256 hash of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④⓪">RP ID</a> expected by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤①">Relying Party</a>.</p>
     <li data-md>
-     <p>Verify that the <a data-link-type="dfn" href="#authdata-flags-up" id="ref-for-authdata-flags-up③">UP</a> bit of the <code><a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③⑤">flags</a></code> in <var>authData</var> is set, unless <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialcreationoptions-mediation" id="ref-for-dom-credentialcreationoptions-mediation⑦">mediation</a></code></code> is set to <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional②⑥">conditional</a></code>.</p>
+     <p>Verify that the <a data-link-type="dfn" href="#authdata-flags-up" id="ref-for-authdata-flags-up③">UP</a> bit of the <code><a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③⑤">flags</a></code> in <var>authData</var> is set, unless <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialcreationoptions-mediation" id="ref-for-dom-credentialcreationoptions-mediation⑦">mediation</a></code></code> is set to <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialmediationrequirement-conditional" id="ref-for-dom-credentialmediationrequirement-conditional②⑤">conditional</a></code>.</p>
     <li data-md>
-     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⓪">Relying Party</a> requires <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④⑤">user verification</a> for this registration,
+     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤②">Relying Party</a> requires <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④⑤">user verification</a> for this registration,
 verify that the <a data-link-type="dfn" href="#authdata-flags-uv" id="ref-for-authdata-flags-uv①②">UV</a> bit of the <code><a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③⑥">flags</a></code> in <var>authData</var> is set.</p>
     <li data-md>
      <p>If the <a data-link-type="dfn" href="#authdata-flags-be" id="ref-for-authdata-flags-be⑥">BE</a> bit of the <code><a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③⑦">flags</a></code> in <var>authData</var> is not set, verify that the <a data-link-type="dfn" href="#authdata-flags-bs" id="ref-for-authdata-flags-bs⑦">BS</a> bit is not set.</p>
     <li data-md>
-     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤①">Relying Party</a> uses the credential’s <a data-link-type="dfn" href="#backup-eligibility" id="ref-for-backup-eligibility③">backup eligibility</a> to inform its user experience flows and/or policies, evaluate the <a data-link-type="dfn" href="#authdata-flags-be" id="ref-for-authdata-flags-be⑦">BE</a> bit of the <code><a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③⑧">flags</a></code> in <var>authData</var>.</p>
+     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤③">Relying Party</a> uses the credential’s <a data-link-type="dfn" href="#backup-eligibility" id="ref-for-backup-eligibility③">backup eligibility</a> to inform its user experience flows and/or policies, evaluate the <a data-link-type="dfn" href="#authdata-flags-be" id="ref-for-authdata-flags-be⑦">BE</a> bit of the <code><a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③⑧">flags</a></code> in <var>authData</var>.</p>
     <li data-md>
-     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤②">Relying Party</a> uses the credential’s <a data-link-type="dfn" href="#backup-state" id="ref-for-backup-state③">backup state</a> to inform its user experience flows and/or policies, evaluate the <a data-link-type="dfn" href="#authdata-flags-bs" id="ref-for-authdata-flags-bs⑧">BS</a> bit of the <code><a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③⑨">flags</a></code> in <var>authData</var>.</p>
+     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤④">Relying Party</a> uses the credential’s <a data-link-type="dfn" href="#backup-state" id="ref-for-backup-state③">backup state</a> to inform its user experience flows and/or policies, evaluate the <a data-link-type="dfn" href="#authdata-flags-bs" id="ref-for-authdata-flags-bs⑧">BS</a> bit of the <code><a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags③⑨">flags</a></code> in <var>authData</var>.</p>
     <li data-md>
      <p>Verify that the "alg" parameter in the <a data-link-type="dfn" href="#authdata-attestedcredentialdata-credentialpublickey" id="ref-for-authdata-attestedcredentialdata-credentialpublickey⑤">credential public key</a> in <var>authData</var> matches the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialparameters-alg" id="ref-for-dom-publickeycredentialparameters-alg②">alg</a></code> attribute of one of the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item①②">items</a> in <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-pubkeycredparams" id="ref-for-dom-publickeycredentialcreationoptions-pubkeycredparams④">pubKeyCredParams</a></code></code>.</p>
     <li id="reg-ceremony-verify-extension-outputs">
      <a class="self-link" href="#reg-ceremony-verify-extension-outputs"></a> Verify that the values of the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑥">client extension outputs</a> in <var>clientExtensionResults</var> and the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output③">authenticator extension
     outputs</a> in the <code><a data-link-type="dfn" href="#authdata-extensions" id="ref-for-authdata-extensions⑦">extensions</a></code> in <var>authData</var> are as expected, considering the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input⑤">client
-    extension input</a> values that were given in <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions④">extensions</a></code></code> and any specific policy of the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤③">Relying Party</a> regarding unsolicited extensions, i.e., those that were not specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions⑤">extensions</a></code></code>.
-    In the general case, the meaning of "are as expected" is specific to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤④">Relying Party</a> and which extensions are in use. 
-     <p class="note" role="note"><span class="marker">Note:</span> <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑦">Client platforms</a> MAY enact local policy that sets additional <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension③">authenticator extensions</a> or <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension②">client extensions</a> and thus cause values to appear in the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output④">authenticator extension outputs</a> or <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑦">client extension outputs</a> that were not originally specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions⑥">extensions</a></code></code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑤">Relying Parties</a> MUST be prepared to handle such
-    situations, whether it be to ignore the unsolicited extensions or reject the attestation. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑥">Relying Party</a> can make this
+    extension input</a> values that were given in <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions④">extensions</a></code></code> and any specific policy of the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑤">Relying Party</a> regarding unsolicited extensions, i.e., those that were not specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions⑤">extensions</a></code></code>.
+    In the general case, the meaning of "are as expected" is specific to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑥">Relying Party</a> and which extensions are in use. 
+     <p class="note" role="note"><span class="marker">Note:</span> <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑦">Client platforms</a> MAY enact local policy that sets additional <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension③">authenticator extensions</a> or <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension②">client extensions</a> and thus cause values to appear in the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output④">authenticator extension outputs</a> or <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑦">client extension outputs</a> that were not originally specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions⑥">extensions</a></code></code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑦">Relying Parties</a> MUST be prepared to handle such
+    situations, whether it be to ignore the unsolicited extensions or reject the attestation. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑧">Relying Party</a> can make this
     decision based on local policy and the extensions in use.</p>
-     <p class="note" role="note"><span class="marker">Note:</span> Since all extensions are OPTIONAL for both the <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑥">client</a> and the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⑥">authenticator</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑦">Relying Party</a> MUST also be
+     <p class="note" role="note"><span class="marker">Note:</span> Since all extensions are OPTIONAL for both the <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑧">client</a> and the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⑥">authenticator</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑨">Relying Party</a> MUST also be
     prepared to handle cases where none or not all of the requested extensions were acted upon.</p>
      <p class="note" role="note"><span class="marker">Note:</span> The <a data-link-type="dfn" href="#supplementalpubkeys" id="ref-for-supplementalpubkeys①">supplementalPubKeys</a> extension has explicit verification procedures, see <a href="#sctn-supplemental-public-keys-extension-verification-create">§ 10.2.1.3.1 Registration (create())</a>.</p>
     <li data-md>
@@ -5869,9 +5990,9 @@ <h3 class="heading settled" data-level="7.1" id="sctn-registering-a-new-credenti
      <a class="self-link" href="#reg-ceremony-assess-trust"></a> Assess the attestation trustworthiness using the outputs of the <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure⑤">verification procedure</a> in <a href="#reg-ceremony-verify-attestation">step 22</a>, as follows: 
      <ul>
       <li data-md>
-       <p>If <a data-link-type="dfn" href="#none" id="ref-for-none④">no attestation</a> was provided, verify that <a data-link-type="dfn" href="#none" id="ref-for-none⑤">None</a> attestation is acceptable under <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑧">Relying Party</a> policy.</p>
+       <p>If <a data-link-type="dfn" href="#none" id="ref-for-none④">no attestation</a> was provided, verify that <a data-link-type="dfn" href="#none" id="ref-for-none⑤">None</a> attestation is acceptable under <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⓪">Relying Party</a> policy.</p>
       <li data-md>
-       <p>If <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①③">self attestation</a> was used, verify that <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①④">self attestation</a> is acceptable under <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑨">Relying Party</a> policy.</p>
+       <p>If <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①③">self attestation</a> was used, verify that <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①④">self attestation</a> is acceptable under <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥①">Relying Party</a> policy.</p>
       <li data-md>
        <p>Otherwise, use the X.509 certificates returned as the <a data-link-type="dfn" href="#attestation-trust-path" id="ref-for-attestation-trust-path②">attestation trust path</a> from the <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure⑥">verification procedure</a> to verify that the attestation public key either correctly chains up to an acceptable root certificate, or is itself an acceptable certificate
 (i.e., it and the root certificate obtained in <a href="#reg-ceremony-attestation-trust-anchors">step 23</a> may be the same).</p>
@@ -5879,8 +6000,8 @@ <h3 class="heading settled" data-level="7.1" id="sctn-registering-a-new-credenti
     <li data-md>
      <p>Verify that the <code><a data-link-type="dfn" href="#authdata-attestedcredentialdata-credentialid" id="ref-for-authdata-attestedcredentialdata-credentialid④">credentialId</a></code> is ≤ 1023 bytes. Credential IDs larger than this many bytes SHOULD cause the RP to fail this <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①②">registration ceremony</a>.</p>
     <li data-md>
-     <p>Verify that the <code><a data-link-type="dfn" href="#authdata-attestedcredentialdata-credentialid" id="ref-for-authdata-attestedcredentialdata-credentialid⑤">credentialId</a></code> is not yet registered for any user. If the <code><a data-link-type="dfn" href="#authdata-attestedcredentialdata-credentialid" id="ref-for-authdata-attestedcredentialdata-credentialid⑥">credentialId</a></code> is already known then the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⓪">Relying Party</a> SHOULD fail this <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①③">registration ceremony</a>.</p>
-     <p class="note" role="note"><span class="marker">NOTE:</span> The rationale for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥①">Relying Parties</a> rejecting duplicate <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③②">credential IDs</a> is as follows: <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③③">credential IDs</a> contain sufficient entropy that accidental duplication is very unlikely. However, <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①⑥">attestation types</a> other than <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑤">self attestation</a> do not include a self-signature to explicitly prove possession of the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①⑤">credential private key</a> at <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑨">registration</a> time. Thus an attacker who has managed to obtain a user’s <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③④">credential ID</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⓪">credential public key</a> for a site (this could be potentially accomplished in various ways), could attempt to register a victim’s credential as their own at that site. If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥②">Relying Party</a> accepts this new registration and replaces the victim’s existing credential registration, and the <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①④">credentials are discoverable</a>, then the victim could be forced to sign into the attacker’s account at their next attempt. Data saved to the site by the victim in that state would then be available to the attacker.</p>
+     <p>Verify that the <code><a data-link-type="dfn" href="#authdata-attestedcredentialdata-credentialid" id="ref-for-authdata-attestedcredentialdata-credentialid⑤">credentialId</a></code> is not yet registered for any user. If the <code><a data-link-type="dfn" href="#authdata-attestedcredentialdata-credentialid" id="ref-for-authdata-attestedcredentialdata-credentialid⑥">credentialId</a></code> is already known then the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥②">Relying Party</a> SHOULD fail this <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①③">registration ceremony</a>.</p>
+     <p class="note" role="note"><span class="marker">NOTE:</span> The rationale for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥③">Relying Parties</a> rejecting duplicate <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③②">credential IDs</a> is as follows: <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③③">credential IDs</a> contain sufficient entropy that accidental duplication is very unlikely. However, <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①⑥">attestation types</a> other than <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑤">self attestation</a> do not include a self-signature to explicitly prove possession of the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①⑤">credential private key</a> at <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑨">registration</a> time. Thus an attacker who has managed to obtain a user’s <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③④">credential ID</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⓪">credential public key</a> for a site (this could be potentially accomplished in various ways), could attempt to register a victim’s credential as their own at that site. If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥④">Relying Party</a> accepts this new registration and replaces the victim’s existing credential registration, and the <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①④">credentials are discoverable</a>, then the victim could be forced to sign into the attacker’s account at their next attempt. Data saved to the site by the victim in that state would then be available to the attacker.</p>
     <li id="reg-ceremony-store-credential-record">
      <a class="self-link" href="#reg-ceremony-store-credential-record"></a> If the attestation statement <var>attStmt</var> verified successfully and is found to be trustworthy,
     then create and store a new <a data-link-type="dfn" href="#credential-record" id="ref-for-credential-record①①">credential record</a> in the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③②">user account</a> that was denoted in <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user⑥">user</a></code></code>,
@@ -5892,7 +6013,7 @@ <h3 class="heading settled" data-level="7.1" id="sctn-registering-a-new-credenti
       <dt data-md><a data-link-type="abstract-op" href="#abstract-opdef-credential-record-id" id="ref-for-abstract-opdef-credential-record-id②">id</a>
       <dd data-md>
        <p><code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credential-id" id="ref-for-dom-credential-id①">id</a></code></code> or <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-rawid" id="ref-for-dom-publickeycredential-rawid②">rawId</a></code></code>,
-whichever format is preferred by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥③">Relying Party</a>.</p>
+whichever format is preferred by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑤">Relying Party</a>.</p>
       <dt data-md><a data-link-type="abstract-op" href="#abstract-opdef-credential-record-publickey" id="ref-for-abstract-opdef-credential-record-publickey">publicKey</a>
       <dd data-md>
        <p>The <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③①">credential public key</a> in <var>authData</var>.</p>
@@ -5923,22 +6044,22 @@ <h3 class="heading settled" data-level="7.1" id="sctn-registering-a-new-credenti
      </dl>
     <li data-md>
      <p>If the attestation statement <var>attStmt</var> successfully verified but is not trustworthy per <a href="#reg-ceremony-assess-trust">step 24</a> above,
-the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥④">Relying Party</a> SHOULD fail the <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①④">registration ceremony</a>.</p>
-     <p class="note" role="note"><span class="marker">NOTE:</span> However, if permitted by policy, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑤">Relying Party</a> MAY register the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⑤">credential ID</a> and credential public key but treat the
-    credential as one with <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑥">self attestation</a> (see <a href="#sctn-attestation-types">§ 6.5.3 Attestation Types</a>). If doing so, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑥">Relying Party</a> is asserting there
+the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑥">Relying Party</a> SHOULD fail the <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①④">registration ceremony</a>.</p>
+     <p class="note" role="note"><span class="marker">NOTE:</span> However, if permitted by policy, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑦">Relying Party</a> MAY register the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⑤">credential ID</a> and credential public key but treat the
+    credential as one with <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑥">self attestation</a> (see <a href="#sctn-attestation-types">§ 6.5.3 Attestation Types</a>). If doing so, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑧">Relying Party</a> is asserting there
     is no cryptographic proof that the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤③">public key credential</a> has been generated by a particular <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⑦">authenticator</a> model.
     See <a data-link-type="biblio" href="#biblio-fidosecref" title="FIDO Security Reference">[FIDOSecRef]</a> and <a data-link-type="biblio" href="#biblio-uafprotocol" title="FIDO UAF Protocol Specification v1.0">[UAFProtocol]</a> for a more detailed discussion.</p>
    </ol>
-   <p>Verification of <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①⑥">attestation objects</a> requires that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑦">Relying Party</a> has a trusted method of determining acceptable trust anchors
+   <p>Verification of <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①⑥">attestation objects</a> requires that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑨">Relying Party</a> has a trusted method of determining acceptable trust anchors
 in <a href="#reg-ceremony-attestation-trust-anchors">step 23</a> above.
-Also, if certificates are being used, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑧">Relying Party</a> MUST have access to certificate status information for the
-intermediate CA certificates. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑨">Relying Party</a> MUST also be able to build the attestation certificate chain if the client did not
+Also, if certificates are being used, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⓪">Relying Party</a> MUST have access to certificate status information for the
+intermediate CA certificates. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦①">Relying Party</a> MUST also be able to build the attestation certificate chain if the client did not
 provide this chain in the attestation information.</p>
    <h3 class="heading settled" data-level="7.2" id="sctn-verifying-assertion"><span class="secno">7.2. </span><span class="content">Verifying an Authentication Assertion</span><a class="self-link" href="#sctn-verifying-assertion"></a></h3>
-   <p>In order to perform an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⑥">authentication ceremony</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⓪">Relying Party</a> MUST proceed as follows:</p>
+   <p>In order to perform an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⑥">authentication ceremony</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦②">Relying Party</a> MUST proceed as follows:</p>
    <ol>
     <li data-md>
-     <p>Let <var>options</var> be a new <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions①②">PublicKeyCredentialRequestOptions</a></code> structure configured to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦①">Relying Party</a>'s needs for the ceremony.</p>
+     <p>Let <var>options</var> be a new <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions①②">PublicKeyCredentialRequestOptions</a></code> structure configured to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦③">Relying Party</a>'s needs for the ceremony.</p>
     <li data-md>
      <p>Call <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③①">navigator.credentials.get()</a></code> and pass <var>options</var> as the <code><code class="idl"><a data-link-type="idl" href="#dom-credentialrequestoptions-publickey" id="ref-for-dom-credentialrequestoptions-publickey④">publicKey</a></code></code> option.
 Let <var>credential</var> be the result of the successfully resolved promise.
@@ -5984,20 +6105,20 @@ <h3 class="heading settled" data-level="7.2" id="sctn-verifying-assertion"><span
     <li data-md>
      <p>Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-challenge" id="ref-for-dom-collectedclientdata-challenge⑦">challenge</a></code></code> equals
 the base64url encoding of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-challenge" id="ref-for-dom-publickeycredentialrequestoptions-challenge③">challenge</a></code></code>.</p>
-    <li id="rp-op-verifying-assertion-step-origin"><a class="self-link" href="#rp-op-verifying-assertion-step-origin"></a> Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin⑧">origin</a></code></code> is an <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①⑤">origin</a> expected by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦②">Relying Party</a>.
+    <li id="rp-op-verifying-assertion-step-origin"><a class="self-link" href="#rp-op-verifying-assertion-step-origin"></a> Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin⑧">origin</a></code></code> is an <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①⑥">origin</a> expected by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦④">Relying Party</a>.
   See <a href="#sctn-validating-origin">§ 13.4.9 Validating the origin of a credential</a> for guidance. 
     <li data-md>
      <p>If <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-toporigin" id="ref-for-dom-collectedclientdata-toporigin⑨">topOrigin</a></code></code> is present:</p>
      <ol>
       <li data-md>
-       <p>Verify that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦③">Relying Party</a> expects this credential to be used within an iframe that is not <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#same-origin-with-its-ancestors" id="ref-for-same-origin-with-its-ancestors⑤">same-origin with its ancestors</a>.</p>
+       <p>Verify that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑤">Relying Party</a> expects this credential to be used within an iframe that is not <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#same-origin-with-its-ancestors" id="ref-for-same-origin-with-its-ancestors⑤">same-origin with its ancestors</a>.</p>
       <li data-md>
-       <p>Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-toporigin" id="ref-for-dom-collectedclientdata-toporigin①⓪">topOrigin</a></code></code> matches the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①⑥">origin</a> of a page
-that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦④">Relying Party</a> expects to be sub-framed within.
+       <p>Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-toporigin" id="ref-for-dom-collectedclientdata-toporigin①⓪">topOrigin</a></code></code> matches the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①⑦">origin</a> of a page
+that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑥">Relying Party</a> expects to be sub-framed within.
 See <a href="#sctn-validating-origin">§ 13.4.9 Validating the origin of a credential</a> for guidance.</p>
      </ol>
     <li id="rp-op-verifying-assertion-step-rpid-hash">
-     <a class="self-link" href="#rp-op-verifying-assertion-step-rpid-hash"></a> Verify that the <code><a data-link-type="dfn" href="#authdata-rpidhash" id="ref-for-authdata-rpidhash③">rpIdHash</a></code> in <var>authData</var> is the SHA-256 hash of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⑧">RP ID</a> expected by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑤">Relying Party</a>. 
+     <a class="self-link" href="#rp-op-verifying-assertion-step-rpid-hash"></a> Verify that the <code><a data-link-type="dfn" href="#authdata-rpidhash" id="ref-for-authdata-rpidhash③">rpIdHash</a></code> in <var>authData</var> is the SHA-256 hash of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④①">RP ID</a> expected by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑦">Relying Party</a>. 
      <p class="note" role="note"><span class="marker">Note:</span> If using the <a data-link-type="dfn" href="#appid" id="ref-for-appid①">appid</a> extension, this step needs some special logic. See <a href="#sctn-appid-extension">§ 10.1.1 FIDO AppID Extension (appid)</a> for details.</p>
     <li data-md>
      <p>Verify that the <a data-link-type="dfn" href="#authdata-flags-up" id="ref-for-authdata-flags-up④">UP</a> bit of the <code><a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags④③">flags</a></code> in <var>authData</var> is set.</p>
@@ -6009,7 +6130,7 @@ <h3 class="heading settled" data-level="7.2" id="sctn-verifying-assertion"><span
     <li data-md>
      <p>If the <a data-link-type="dfn" href="#authdata-flags-be" id="ref-for-authdata-flags-be⑨">BE</a> bit of the <code><a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags④⑥">flags</a></code> in <var>authData</var> is not set, verify that the <a data-link-type="dfn" href="#authdata-flags-bs" id="ref-for-authdata-flags-bs①⓪">BS</a> bit is not set.</p>
     <li data-md>
-     <p>If the credential <a data-link-type="dfn" href="#backup-state" id="ref-for-backup-state④">backup state</a> is used as part of <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑥">Relying Party</a> business logic or policy,
+     <p>If the credential <a data-link-type="dfn" href="#backup-state" id="ref-for-backup-state④">backup state</a> is used as part of <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑧">Relying Party</a> business logic or policy,
 let <var>currentBe</var> and <var>currentBs</var> be the values of the <a data-link-type="dfn" href="#authdata-flags-be" id="ref-for-authdata-flags-be①⓪">BE</a> and <a data-link-type="dfn" href="#authdata-flags-bs" id="ref-for-authdata-flags-bs①①">BS</a> bits, respectively,
 of the <code><a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags④⑦">flags</a></code> in <var>authData</var>.
 Compare <var>currentBe</var> and <var>currentBs</var> with <code><var>credentialRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-credential-record-backupeligible" id="ref-for-abstract-opdef-credential-record-backupeligible①">backupEligible</a></code> and <code><var>credentialRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-credential-record-backupstate" id="ref-for-abstract-opdef-credential-record-backupstate①">backupState</a></code>:</p>
@@ -6019,18 +6140,18 @@ <h3 class="heading settled" data-level="7.2" id="sctn-verifying-assertion"><span
       <li data-md>
        <p>If <code><var>credentialRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-credential-record-backupeligible" id="ref-for-abstract-opdef-credential-record-backupeligible③">backupEligible</a></code> is not set, verify that <var>currentBe</var> is not set.</p>
       <li data-md>
-       <p>Apply <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑦">Relying Party</a> policy, if any.</p>
+       <p>Apply <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑨">Relying Party</a> policy, if any.</p>
      </ol>
-     <p class="note" role="note"><span class="marker">Note:</span> See <a href="#sctn-credential-backup">§ 6.1.3 Credential Backup State</a> for examples of how a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑧">Relying Party</a> might process the <a data-link-type="dfn" href="#authdata-flags-bs" id="ref-for-authdata-flags-bs①②">BS</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags④⑧">flag</a> values.</p>
+     <p class="note" role="note"><span class="marker">Note:</span> See <a href="#sctn-credential-backup">§ 6.1.3 Credential Backup State</a> for examples of how a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⓪">Relying Party</a> might process the <a data-link-type="dfn" href="#authdata-flags-bs" id="ref-for-authdata-flags-bs①②">BS</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags④⑧">flag</a> values.</p>
     <li id="authn-ceremony-verify-extension-outputs">
      <a class="self-link" href="#authn-ceremony-verify-extension-outputs"></a> Verify that the values of the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑧">client extension outputs</a> in <var>clientExtensionResults</var> and the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output⑤">authenticator extension
     outputs</a> in the <code><a data-link-type="dfn" href="#authdata-extensions" id="ref-for-authdata-extensions⑧">extensions</a></code> in <var>authData</var> are as expected, considering the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input⑥">client
-    extension input</a> values that were given in <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-extensions" id="ref-for-dom-publickeycredentialrequestoptions-extensions④">extensions</a></code></code> and any specific policy of the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑨">Relying Party</a> regarding unsolicited extensions, i.e., those that were not specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-extensions" id="ref-for-dom-publickeycredentialrequestoptions-extensions⑤">extensions</a></code></code>.
-    In the general case, the meaning of "are as expected" is specific to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⓪">Relying Party</a> and which extensions are in use. 
-     <p class="note" role="note"><span class="marker">Note:</span> <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑧">Client platforms</a> MAY enact local policy that sets additional <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension④">authenticator extensions</a> or <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension③">client extensions</a> and thus cause values to appear in the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output⑥">authenticator extension outputs</a> or <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑨">client extension outputs</a> that were not originally specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-extensions" id="ref-for-dom-publickeycredentialrequestoptions-extensions⑥">extensions</a></code></code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧①">Relying Parties</a> MUST be prepared to handle such
-    situations, whether it be to ignore the unsolicited extensions or reject the assertion. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧②">Relying Party</a> can make this
+    extension input</a> values that were given in <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-extensions" id="ref-for-dom-publickeycredentialrequestoptions-extensions④">extensions</a></code></code> and any specific policy of the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧①">Relying Party</a> regarding unsolicited extensions, i.e., those that were not specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-extensions" id="ref-for-dom-publickeycredentialrequestoptions-extensions⑤">extensions</a></code></code>.
+    In the general case, the meaning of "are as expected" is specific to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧②">Relying Party</a> and which extensions are in use. 
+     <p class="note" role="note"><span class="marker">Note:</span> <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑧">Client platforms</a> MAY enact local policy that sets additional <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension④">authenticator extensions</a> or <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension③">client extensions</a> and thus cause values to appear in the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output⑥">authenticator extension outputs</a> or <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑨">client extension outputs</a> that were not originally specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-extensions" id="ref-for-dom-publickeycredentialrequestoptions-extensions⑥">extensions</a></code></code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧③">Relying Parties</a> MUST be prepared to handle such
+    situations, whether it be to ignore the unsolicited extensions or reject the assertion. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧④">Relying Party</a> can make this
     decision based on local policy and the extensions in use.</p>
-     <p class="note" role="note"><span class="marker">Note:</span> Since all extensions are OPTIONAL for both the <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑦">client</a> and the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⑧">authenticator</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧③">Relying Party</a> MUST also be
+     <p class="note" role="note"><span class="marker">Note:</span> Since all extensions are OPTIONAL for both the <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑨">client</a> and the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⑧">authenticator</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑤">Relying Party</a> MUST also be
     prepared to handle cases where none or not all of the requested extensions were acted upon.</p>
      <p class="note" role="note"><span class="marker">Note:</span> The <a data-link-type="dfn" href="#supplementalpubkeys" id="ref-for-supplementalpubkeys②">supplementalPubKeys</a> extension has explicit verification procedures, see <a href="#sctn-supplemental-public-keys-extension-verification-get">§ 10.2.1.3.2 Authentication (get())</a>.</p>
     <li data-md>
@@ -6052,9 +6173,9 @@ <h3 class="heading settled" data-level="7.2" id="sctn-verifying-assertion"><span
         <dd>This is a signal that
           the authenticator may be cloned, i.e. at least
           two copies of the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①⑥">credential private key</a> may exist and are
-          being used in parallel. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧④">Relying Parties</a> should incorporate this information
+          being used in parallel. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑥">Relying Parties</a> should incorporate this information
           into their risk scoring.
-          Whether the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑤">Relying Party</a> updates <code><var>credentialRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-credential-record-signcount" id="ref-for-abstract-opdef-credential-record-signcount④">signCount</a></code> below in this case, or not, or fails the <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⑨">authentication ceremony</a> or not, is <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑥">Relying Party</a>-specific. 
+          Whether the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑦">Relying Party</a> updates <code><var>credentialRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-credential-record-signcount" id="ref-for-abstract-opdef-credential-record-signcount④">signCount</a></code> below in this case, or not, or fails the <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⑨">authentication ceremony</a> or not, is <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑧">Relying Party</a>-specific. 
        </dl>
      </ul>
     <li id="authn-ceremony-update-credential-record">
@@ -6070,7 +6191,7 @@ <h3 class="heading settled" data-level="7.2" id="sctn-verifying-assertion"><span
 This change SHOULD require authorization by an additional <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②④">authentication factor</a> equivalent to WebAuthn <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④⑨">user verification</a>;
 if not authorized, skip this step.</p>
      </ol>
-     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑦">Relying Party</a> performs additional security checks beyond these WebAuthn <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⓪">authentication ceremony</a> steps,
+     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑨">Relying Party</a> performs additional security checks beyond these WebAuthn <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⓪">authentication ceremony</a> steps,
     the above state updates SHOULD be deferred to after those additional checks are completed successfully.</p>
     <li data-md>
      <p>If all the above steps are successful, continue with the <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③①">authentication ceremony</a> as appropriate. Otherwise, fail the <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③②">authentication ceremony</a>.</p>
@@ -6126,7 +6247,7 @@ <h3 class="heading settled" data-level="8.2" id="sctn-packed-attestation"><span
      <dl>
       <dt data-md>alg
       <dd data-md>
-       <p>A <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier①③">COSEAlgorithmIdentifier</a></code> containing the identifier of the algorithm used to generate the <a data-link-type="dfn" href="#attestation-signature" id="ref-for-attestation-signature①⓪">attestation signature</a>.</p>
+       <p>A <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier①④">COSEAlgorithmIdentifier</a></code> containing the identifier of the algorithm used to generate the <a data-link-type="dfn" href="#attestation-signature" id="ref-for-attestation-signature①⓪">attestation signature</a>.</p>
       <dt data-md>sig
       <dd data-md>
        <p>A byte string containing the <a data-link-type="dfn" href="#attestation-signature" id="ref-for-attestation-signature①①">attestation signature</a>.</p>
@@ -6217,8 +6338,8 @@ <h4 class="heading settled" data-level="8.2.1" id="sctn-packed-attestation-cert-
     <li data-md>
      <p>If the related attestation root certificate is used for multiple authenticator models, the Extension OID <code>1.3.6.1.4.1.45724.1.1.4</code> (<code>id-fido-gen-ce-aaguid</code>) MUST be present, containing the AAGUID as a 16-byte OCTET STRING.
 The extension MUST NOT be marked as critical.</p>
-     <p>As <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑧">Relying Parties</a> may not know if the attestation root
-certificate is used for multiple authenticator models, it is suggested that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑨">Relying Parties</a> check if the extension
+     <p>As <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⓪">Relying Parties</a> may not know if the attestation root
+certificate is used for multiple authenticator models, it is suggested that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨①">Relying Parties</a> check if the extension
 is present, and if it is, then validate that it contains that same AAGUID as presented in the <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①⑦">attestation object</a>.</p>
      <p>Note that an X.509 Extension encodes the DER-encoding of the value in an OCTET STRING.
 Thus, the AAGUID MUST be wrapped in <i>two</i> OCTET STRINGS to be valid.</p>
@@ -6293,7 +6414,7 @@ <h3 class="heading settled" data-level="8.3" id="sctn-tpm-attestation"><span cla
        <p>The version of the TPM specification to which the signature conforms.</p>
       <dt data-md>alg
       <dd data-md>
-       <p>A <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier①④">COSEAlgorithmIdentifier</a></code> containing the identifier of the algorithm used to generate the <a data-link-type="dfn" href="#attestation-signature" id="ref-for-attestation-signature①②">attestation signature</a>.</p>
+       <p>A <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier①⑤">COSEAlgorithmIdentifier</a></code> containing the identifier of the algorithm used to generate the <a data-link-type="dfn" href="#attestation-signature" id="ref-for-attestation-signature①②">attestation signature</a>.</p>
       <dt data-md>x5c
       <dd data-md>
        <p><var>aikCert</var> followed by its certificate chain, in X.509 encoding.</p>
@@ -6380,7 +6501,7 @@ <h3 class="heading settled" data-level="8.4" id="sctn-android-key-attestation"><
 attestation statement is based on the <a href="https://source.android.com/security/keystore/attestation">Android key
 attestation</a>. In these cases, the attestation statement
 is produced by a component running in a secure operating environment, but the <a data-link-type="dfn" href="#authenticator-data-for-the-attestation" id="ref-for-authenticator-data-for-the-attestation②">authenticator data for the attestation</a> is
-produced outside this environment. The <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③③">WebAuthn Relying Party</a> is expected to check that the <a data-link-type="dfn" href="#authenticator-data-claimed-to-have-been-used-for-the-attestation" id="ref-for-authenticator-data-claimed-to-have-been-used-for-the-attestation">authenticator data claimed to have been used for
+produced outside this environment. The <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③④">WebAuthn Relying Party</a> is expected to check that the <a data-link-type="dfn" href="#authenticator-data-claimed-to-have-been-used-for-the-attestation" id="ref-for-authenticator-data-claimed-to-have-been-used-for-the-attestation">authenticator data claimed to have been used for
 the attestation</a> is consistent with the fields of the attestation certificate’s extension data.</p>
    <dl>
     <dt data-md>Attestation statement format identifier
@@ -6433,7 +6554,7 @@ <h3 class="heading settled" data-level="8.4" id="sctn-android-key-attestation"><
        <ul>
         <li data-md>
          <p>The <code>AuthorizationList.allApplications</code> field is <em>not</em> present on either authorization list
-(<code>softwareEnforced</code> nor <code>teeEnforced</code>), since PublicKeyCredential MUST be <a data-link-type="dfn" href="#scope" id="ref-for-scope①⑥">scoped</a> to the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⑨">RP ID</a>.</p>
+(<code>softwareEnforced</code> nor <code>teeEnforced</code>), since PublicKeyCredential MUST be <a data-link-type="dfn" href="#scope" id="ref-for-scope①⑥">scoped</a> to the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④②">RP ID</a>.</p>
         <li data-md>
          <p>For the following, use only the <code>teeEnforced</code> authorization list if the RP wants to accept only keys from a
 trusted execution environment, otherwise use the union of <code>teeEnforced</code> and <code>softwareEnforced</code>.</p>
@@ -6546,7 +6667,7 @@ <h3 class="heading settled" data-level="8.6" id="sctn-fido-u2f-attestation"><spa
       <dt data-md>sig
       <dd data-md>
        <p>The <a data-link-type="dfn" href="#attestation-signature" id="ref-for-attestation-signature①④">attestation signature</a>.
-The signature was calculated over the (raw) U2F registration response message <a data-link-type="biblio" href="#biblio-fido-u2f-message-formats" title="FIDO U2F Raw Message Formats">[FIDO-U2F-Message-Formats]</a> received by the <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑧">client</a> from the authenticator.</p>
+The signature was calculated over the (raw) U2F registration response message <a data-link-type="biblio" href="#biblio-fido-u2f-message-formats" title="FIDO U2F Raw Message Formats">[FIDO-U2F-Message-Formats]</a> received by the <a data-link-type="dfn" href="#client" id="ref-for-client⑨⓪">client</a> from the authenticator.</p>
      </dl>
     <dt data-md>Signing procedure
     <dd data-md>
@@ -6555,7 +6676,7 @@ <h3 class="heading settled" data-level="8.6" id="sctn-fido-u2f-attestation"><spa
 and let <var>clientDataHash</var> denote the <a data-link-type="dfn" href="#collectedclientdata-hash-of-the-serialized-client-data" id="ref-for-collectedclientdata-hash-of-the-serialized-client-data①⑨">hash of the serialized client data</a>. (Since SHA-256 is used to hash the
 serialized <a data-link-type="dfn" href="#client-data" id="ref-for-client-data①①">client data</a>, <var>clientDataHash</var> will be 32 bytes long.)</p>
      <p>Generate a Registration Response Message as specified in <a data-link-type="biblio" href="#biblio-fido-u2f-message-formats" title="FIDO U2F Raw Message Formats">[FIDO-U2F-Message-Formats]</a> <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-u2f-v1.1-id-20160915/fido-u2f-raw-message-formats-v1.1-id-20160915.html#registration-response-message-success" id="ref-for-registration-response-message-success">Section 4.3</a>, with the application parameter set to the
-SHA-256 hash of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④⓪">RP ID</a> that the given <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤⑤">credential</a> is <a data-link-type="dfn" href="#scope" id="ref-for-scope①⑦">scoped</a> to, the challenge parameter set to <var>clientDataHash</var>, and the key handle
+SHA-256 hash of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④③">RP ID</a> that the given <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤⑤">credential</a> is <a data-link-type="dfn" href="#scope" id="ref-for-scope①⑦">scoped</a> to, the challenge parameter set to <var>clientDataHash</var>, and the key handle
 parameter set to the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⑥">credential ID</a> of the given credential. Set the raw signature part of this Registration Response Message (i.e., without the <a data-link-type="dfn" href="#user-public-key" id="ref-for-user-public-key①">user public key</a>,
 key handle, and attestation certificates) as <var>sig</var> and set the attestation certificates of
 the attestation public key as <var>x5c</var>.</p>
@@ -6601,7 +6722,7 @@ <h3 class="heading settled" data-level="8.6" id="sctn-fido-u2f-attestation"><spa
      </ol>
    </dl>
    <h3 class="heading settled" data-level="8.7" id="sctn-none-attestation"><span class="secno">8.7. </span><span class="content">None Attestation Statement Format</span><a class="self-link" href="#sctn-none-attestation"></a></h3>
-   <p>The none attestation statement format is used to replace any <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③②">authenticator</a>-provided <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③⑧">attestation statement</a> when a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③④">WebAuthn Relying Party</a> indicates it does not wish to receive attestation information, see <a href="#enum-attestation-convey">§ 5.4.7 Attestation Conveyance Preference Enumeration (enum AttestationConveyancePreference)</a>.</p>
+   <p>The none attestation statement format is used to replace any <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③②">authenticator</a>-provided <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③⑧">attestation statement</a> when a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑤">WebAuthn Relying Party</a> indicates it does not wish to receive attestation information, see <a href="#enum-attestation-convey">§ 5.4.7 Attestation Conveyance Preference Enumeration (enum AttestationConveyancePreference)</a>.</p>
    <p>The <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③③">authenticator</a> MAY also directly generate attestation statements of this format
 if the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③④">authenticator</a> does not support <a data-link-type="dfn" href="#attestation" id="ref-for-attestation②④">attestation</a>.</p>
    <dl>
@@ -6718,10 +6839,10 @@ <h3 class="heading settled" data-level="8.9" id="sctn-compound-attestation"><spa
 as follows:</p>
      <ol>
       <li data-md>
-       <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①⑨">For each</a> <var>subStmt</var> of <var>attStmt</var>, evaluate the <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure①③">verification procedure</a> corresponding to the <a data-link-type="dfn" href="#attestation-statement-format-identifier" id="ref-for-attestation-statement-format-identifier⑤">attestation statement format identifier</a> <code><var>subStmt</var>.fmt</code> with <a data-link-type="dfn" href="#verification-procedure-inputs" id="ref-for-verification-procedure-inputs⑥">verification procedure inputs</a> <var>subStmt</var>, <var>authenticatorData</var> and <var>clientDataHash</var>.</p>
-       <p>If validation fails for one or more <var>subStmt</var>, decide the appropriate result based on <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⓪">Relying Party</a> policy.</p>
+       <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate②⓪">For each</a> <var>subStmt</var> of <var>attStmt</var>, evaluate the <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure①③">verification procedure</a> corresponding to the <a data-link-type="dfn" href="#attestation-statement-format-identifier" id="ref-for-attestation-statement-format-identifier⑤">attestation statement format identifier</a> <code><var>subStmt</var>.fmt</code> with <a data-link-type="dfn" href="#verification-procedure-inputs" id="ref-for-verification-procedure-inputs⑥">verification procedure inputs</a> <var>subStmt</var>, <var>authenticatorData</var> and <var>clientDataHash</var>.</p>
+       <p>If validation fails for one or more <var>subStmt</var>, decide the appropriate result based on <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨②">Relying Party</a> policy.</p>
       <li data-md>
-       <p>If sufficiently many (as determined by <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨①">Relying Party</a> policy) <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item①③">items</a> of <var>attStmt</var> verify successfully,
+       <p>If sufficiently many (as determined by <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨③">Relying Party</a> policy) <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item①③">items</a> of <var>attStmt</var> verify successfully,
 return implementation-specific values representing any combination of outputs from successful <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure①④">verification procedures</a>.</p>
      </ol>
    </dl>
@@ -6739,10 +6860,10 @@ <h2 class="heading settled" data-level="9" id="sctn-extensions"><span class="sec
     <li data-md>
      <p><a data-link-type="dfn" href="#client-extension-processing" id="ref-for-client-extension-processing⑥">Client extension processing</a> for <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension③">registration extensions</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension③">authentication extensions</a>.</p>
    </ul>
-   <p>When creating a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤⑦">public key credential</a> or requesting an <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①③">authentication assertion</a>, a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑤">WebAuthn Relying Party</a> can request the use of a set
-of extensions. These extensions will be invoked during the requested operation if they are supported by the client and/or the <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator⑨">WebAuthn Authenticator</a>. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨②">Relying Party</a> sends the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input⑦">client extension input</a> for each extension in the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③③">get()</a></code> call
-(for <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension④">authentication extensions</a>) or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③⓪">create()</a></code> call (for <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension④">registration extensions</a>) to the <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑨">client</a>.
-The <a data-link-type="dfn" href="#client" id="ref-for-client⑨⓪">client</a> performs <a data-link-type="dfn" href="#client-extension-processing" id="ref-for-client-extension-processing⑦">client extension processing</a> for each extension that the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑨">client platform</a> supports, and augments the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data①③">client data</a> as specified by each extension, by including the <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①⓪">extension identifier</a> and <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①⓪">client extension output</a> values.</p>
+   <p>When creating a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤⑦">public key credential</a> or requesting an <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①③">authentication assertion</a>, a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑥">WebAuthn Relying Party</a> can request the use of a set
+of extensions. These extensions will be invoked during the requested operation if they are supported by the client and/or the <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator⑨">WebAuthn Authenticator</a>. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨④">Relying Party</a> sends the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input⑦">client extension input</a> for each extension in the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③③">get()</a></code> call
+(for <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension④">authentication extensions</a>) or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③⓪">create()</a></code> call (for <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension④">registration extensions</a>) to the <a data-link-type="dfn" href="#client" id="ref-for-client⑨①">client</a>.
+The <a data-link-type="dfn" href="#client" id="ref-for-client⑨②">client</a> performs <a data-link-type="dfn" href="#client-extension-processing" id="ref-for-client-extension-processing⑦">client extension processing</a> for each extension that the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑨">client platform</a> supports, and augments the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data①③">client data</a> as specified by each extension, by including the <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①⓪">extension identifier</a> and <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①⓪">client extension output</a> values.</p>
    <p>An extension can also be an <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticator-extension">authenticator extension</dfn>, meaning that the extension involves communication with and
 processing by the authenticator. <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension⑤">Authenticator extensions</a> define the following steps and data:</p>
    <ul>
@@ -6760,11 +6881,11 @@ <h2 class="heading settled" data-level="9" id="sctn-extensions"><span class="sec
 Since <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output⑧">authenticator extension output</a> is returned as part of the signed <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data④⑦">authenticator data</a>, authenticator extensions
 MAY also specify an <a data-link-type="dfn" href="#unsigned-extension-outputs" id="ref-for-unsigned-extension-outputs">unsigned extension output</a>, e.g. for cases where an output itself depends on <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data④⑧">authenticator data</a>.
 Part of the <a data-link-type="dfn" href="#client-extension-processing" id="ref-for-client-extension-processing⑨">client extension processing</a> for <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension⑦">authenticator extensions</a> is to use the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output⑨">authenticator extension output</a> and <a data-link-type="dfn" href="#unsigned-extension-outputs" id="ref-for-unsigned-extension-outputs①">unsigned extension output</a> as an input to creating the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①①">client extension output</a>.</p>
-   <p>All <a data-link-type="dfn" href="#webauthn-extensions" id="ref-for-webauthn-extensions⑧">WebAuthn Extensions</a> are OPTIONAL for both clients and authenticators. Thus, any extensions requested by a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨③">Relying Party</a> MAY be
+   <p>All <a data-link-type="dfn" href="#webauthn-extensions" id="ref-for-webauthn-extensions⑧">WebAuthn Extensions</a> are OPTIONAL for both clients and authenticators. Thus, any extensions requested by a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑤">Relying Party</a> MAY be
 ignored by the client browser or OS and not passed to the authenticator at all, or they MAY be ignored by the authenticator.
-Ignoring an extension is never considered a failure in WebAuthn API processing, so when <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨④">Relying Parties</a> include extensions with any
+Ignoring an extension is never considered a failure in WebAuthn API processing, so when <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑥">Relying Parties</a> include extensions with any
 API calls, they MUST be prepared to handle cases where some or all of those extensions are ignored.</p>
-   <p>All <a data-link-type="dfn" href="#webauthn-extensions" id="ref-for-webauthn-extensions⑨">WebAuthn Extensions</a> MUST be defined in such a way that lack of support for them by the <a data-link-type="dfn" href="#client" id="ref-for-client⑨①">client</a> or <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑤">authenticator</a> does not endanger the user’s security or privacy.
+   <p>All <a data-link-type="dfn" href="#webauthn-extensions" id="ref-for-webauthn-extensions⑨">WebAuthn Extensions</a> MUST be defined in such a way that lack of support for them by the <a data-link-type="dfn" href="#client" id="ref-for-client⑨③">client</a> or <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑤">authenticator</a> does not endanger the user’s security or privacy.
 For instance, if an extension requires client processing, it could be defined in a manner that ensures
 that a naïve pass-through that simply transcodes <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input⑨">client extension inputs</a> from JSON to CBOR
 will produce a semantically invalid <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input⑧">authenticator extension input</a> value, resulting in the extension
@@ -6794,18 +6915,18 @@ <h3 class="heading settled" data-level="9.2" id="sctn-extension-specification"><
 sent via the <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①⑦">authenticatorGetAssertion</a> or <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential①⑦">authenticatorMakeCredential</a> call,
 the <a data-link-type="dfn" href="#authenticator-extension-processing" id="ref-for-authenticator-extension-processing③">authenticator extension processing</a> rules, and the <a data-link-type="dfn" href="#cbor" id="ref-for-cbor①⑤">CBOR</a> <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output①⓪">authenticator extension output</a> value.
 Extensions MAY specify <a data-link-type="dfn" href="#unsigned-extension-outputs" id="ref-for-unsigned-extension-outputs②">unsigned extension outputs</a>.</p>
-   <p>Any <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑤">client extension</a> that is processed by the client MUST return a <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①③">client extension output</a> value so that the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑥">WebAuthn Relying Party</a> knows that the extension was honored by the client. Similarly, any extension that requires authenticator processing MUST return
-an <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output①①">authenticator extension output</a> to let the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑤">Relying Party</a> know that the extension was honored by the authenticator. If an
+   <p>Any <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑤">client extension</a> that is processed by the client MUST return a <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①③">client extension output</a> value so that the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑦">WebAuthn Relying Party</a> knows that the extension was honored by the client. Similarly, any extension that requires authenticator processing MUST return
+an <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output①①">authenticator extension output</a> to let the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑦">Relying Party</a> know that the extension was honored by the authenticator. If an
 extension does not otherwise require any result values, it SHOULD be defined as returning a JSON Boolean <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①④">client extension
 output</a> result, set to <code>true</code> to signify that the extension was understood and processed. Likewise, any <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension⑨">authenticator
 extension</a> that does not otherwise require any result values MUST return a value and SHOULD return a CBOR Boolean <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output①②">authenticator extension output</a> result, set to <code>true</code> to signify that the extension was understood and processed.</p>
    <h3 class="heading settled" data-level="9.3" id="sctn-extension-request-parameters"><span class="secno">9.3. </span><span class="content">Extending Request Parameters</span><a class="self-link" href="#sctn-extension-request-parameters"></a></h3>
    <p>An extension defines one or two request arguments. The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="client-extension-input">client extension input</dfn>,
-which is a value that can be encoded in JSON, is passed from the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑦">WebAuthn Relying Party</a> to the client
+which is a value that can be encoded in JSON, is passed from the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑧">WebAuthn Relying Party</a> to the client
 in the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⑥">get()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③③">create()</a></code> call,
 while the <a data-link-type="dfn" href="#cbor" id="ref-for-cbor①⑥">CBOR</a> <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticator-extension-input">authenticator extension input</dfn> is
 passed from the client to the authenticator for <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension①⓪">authenticator extensions</a> during the processing of these calls.</p>
-   <p>A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑥">Relying Party</a> simultaneously requests the use of an extension and sets its <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①①">client extension input</a> by including an entry in the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions⑦">extensions</a></code> option to the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③④">create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⑦">get()</a></code> call.
+   <p>A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑧">Relying Party</a> simultaneously requests the use of an extension and sets its <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①①">client extension input</a> by including an entry in the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions⑦">extensions</a></code> option to the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③④">create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⑦">get()</a></code> call.
 The entry key is the <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①③">extension identifier</a> and the value is the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①②">client extension input</a>.</p>
    <p class="note" role="note"><span class="marker">Note:</span> Other documents have specified extensions where the extension input does not always use the <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①④">extension identifier</a> as the entry key.
 New extensions SHOULD follow the above convention.</p>
@@ -6824,8 +6945,8 @@ <h3 class="heading settled" data-level="9.3" id="sctn-extension-request-paramete
 <c- p>});</c->
 </pre>
    <p>Extension definitions MUST specify the valid values for their <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①③">client extension input</a>. Clients SHOULD ignore extensions with
-an invalid <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①④">client extension input</a>. If an extension does not require any parameters from the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑦">Relying Party</a>, it SHOULD be defined
-as taking a Boolean client argument, set to <code>true</code> to signify that the extension is requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑧">Relying Party</a>.</p>
+an invalid <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①④">client extension input</a>. If an extension does not require any parameters from the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑨">Relying Party</a>, it SHOULD be defined
+as taking a Boolean client argument, set to <code>true</code> to signify that the extension is requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⓪">Relying Party</a>.</p>
    <p>Extensions that only affect client processing need not specify <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①⓪">authenticator extension input</a>. Extensions that have
 authenticator processing MUST specify the method of computing the <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①①">authenticator extension input</a> from the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①⑤">client extension
 input</a>,
@@ -6845,7 +6966,7 @@ <h3 class="heading settled" data-level="9.3" id="sctn-extension-request-paramete
    <p class="note" role="note"><span class="marker">Note:</span> Extensions should aim to define authenticator arguments that are as small as possible. Some authenticators communicate
     over low-bandwidth links such as Bluetooth Low-Energy or NFC.</p>
    <h3 class="heading settled" data-level="9.4" id="sctn-client-extension-processing"><span class="secno">9.4. </span><span class="content"><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="client-extension-processing">Client Extension Processing</dfn></span><a class="self-link" href="#sctn-client-extension-processing"></a></h3>
-   <p>Extensions MAY define additional processing requirements on the <a data-link-type="dfn" href="#client" id="ref-for-client⑨②">client</a> during the creation of credentials or the
+   <p>Extensions MAY define additional processing requirements on the <a data-link-type="dfn" href="#client" id="ref-for-client⑨④">client</a> during the creation of credentials or the
 generation of an assertion. The <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①⑦">client extension input</a> for the extension is used as an input to this client processing.
 For each supported <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑥">client extension</a>, the client adds an entry to the <var>clientExtensions</var> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map①②">map</a> with the <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①⑦">extension identifier</a> as the key, and the extension’s <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①⑧">client extension input</a> as the value.</p>
    <p>Likewise, the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①⑤">client extension outputs</a> are represented as a dictionary in the result of <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientextensionresults" id="ref-for-dom-publickeycredential-getclientextensionresults④">getClientExtensionResults()</a></code> with <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①⑧">extension identifiers</a> as keys, and the <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="client-extension-output">client extension output</dfn> value of each extension as the value.
@@ -6862,7 +6983,7 @@ <h3 class="heading settled" data-level="9.5" id="sctn-authenticator-extension-pr
 as a separate map, keyed with the same <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier②①">extension identifier</a>. This map only contains entries for authenticator
 extensions that make use of unsigned outputs. Unsigned outputs are useful when extensions output a signature over
 the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data⑤②">authenticator data</a> (because otherwise a signature would have to sign over itself, which isn’t possible) or when
-some extension outputs should not be sent to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑨">Relying Party</a>.</p>
+some extension outputs should not be sent to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪①">Relying Party</a>.</p>
    <p class="note" role="note"><span class="marker">Note:</span> In <a data-link-type="biblio" href="#biblio-fido-ctap" title="Client to Authenticator Protocol (CTAP)">[FIDO-CTAP]</a> <a data-link-type="dfn" href="#unsigned-extension-outputs" id="ref-for-unsigned-extension-outputs④">unsigned extension outputs</a> are returned as a CBOR map in a top-level field named <code>unsignedExtensionOutputs</code> from both <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential①⑨">authenticatorMakeCredential</a> and <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①⑨">authenticatorGetAssertion</a>.</p>
    <p>For each supported extension, the <a data-link-type="dfn" href="#authenticator-extension-processing" id="ref-for-authenticator-extension-processing④">authenticator extension processing</a> rule for that extension is used create the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output①⑤">authenticator extension output</a>, and <a data-link-type="dfn" href="#unsigned-extension-outputs" id="ref-for-unsigned-extension-outputs⑤">unsigned extension output</a> if used, from the <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①⑦">authenticator extension input</a> and possibly also other inputs.
 There MUST NOT be any values returned for ignored extensions.</p>
@@ -6873,13 +6994,13 @@ <h2 class="heading settled" data-level="10" id="sctn-defined-extensions"><span c
    <h3 class="heading settled" data-level="10.1" id="sctn-defined-client-extensions"><span class="secno">10.1. </span><span class="content">Client Extensions</span><a class="self-link" href="#sctn-defined-client-extensions"></a></h3>
    <p>This section defines extensions that are only <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑦">client extensions</a>.</p>
    <h4 class="heading settled" data-level="10.1.1" id="sctn-appid-extension"><span class="secno">10.1.1. </span><span class="content">FIDO <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="appid">AppID</dfn> Extension (appid)</span><a class="self-link" href="#sctn-appid-extension"></a></h4>
-   <p>This extension allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑧">WebAuthn Relying Parties</a> that have previously registered a
+   <p>This extension allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑨">WebAuthn Relying Parties</a> that have previously registered a
 credential using the legacy FIDO U2F JavaScript API <a data-link-type="biblio" href="#biblio-fidou2fjavascriptapi" title="FIDO U2F JavaScript API">[FIDOU2FJavaScriptAPI]</a> to request an <a data-link-type="dfn" href="#assertion" id="ref-for-assertion④">assertion</a>. The
-FIDO APIs use an alternative identifier for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⓪">Relying Parties</a> called an <var>AppID</var> <a data-link-type="biblio" href="#biblio-fido-appid" title="FIDO AppID and Facet Specification">[FIDO-APPID]</a>, and any credentials created using those APIs will be <a data-link-type="dfn" href="#scope" id="ref-for-scope①⑧">scoped</a> to
+FIDO APIs use an alternative identifier for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪②">Relying Parties</a> called an <var>AppID</var> <a data-link-type="biblio" href="#biblio-fido-appid" title="FIDO AppID and Facet Specification">[FIDO-APPID]</a>, and any credentials created using those APIs will be <a data-link-type="dfn" href="#scope" id="ref-for-scope①⑧">scoped</a> to
 that identifier. Without this extension, they would need to be re-registered in
-order to be <a data-link-type="dfn" href="#scope" id="ref-for-scope①⑨">scoped</a> to an <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④①">RP ID</a>.</p>
+order to be <a data-link-type="dfn" href="#scope" id="ref-for-scope①⑨">scoped</a> to an <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④④">RP ID</a>.</p>
    <p>In addition to setting the <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsclientinputs-appid" id="ref-for-dom-authenticationextensionsclientinputs-appid">appid</a></code> extension input,
-using this extension requires some additional processing by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪①">Relying Party</a> in order to allow users to <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①③">authenticate</a> using their registered U2F credentials:</p>
+using this extension requires some additional processing by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪③">Relying Party</a> in order to allow users to <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①③">authenticate</a> using their registered U2F credentials:</p>
    <ol>
     <li data-md>
      <p>List the desired U2F credentials in the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②①">allowCredentials</a></code> option
@@ -6894,18 +7015,18 @@ <h4 class="heading settled" data-level="10.1.1" id="sctn-appid-extension"><span
  of both WebAuthn <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⑦">credential IDs</a> and U2F key handles;
  stating the <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsclientinputs-appid" id="ref-for-dom-authenticationextensionsclientinputs-appid①">appid</a></code> via this extension
  does not prevent the user from using a WebAuthn-registered credential
- scoped to the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④②">RP ID</a> stated in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-rpid" id="ref-for-dom-publickeycredentialrequestoptions-rpid⑤">rpId</a></code>.</p>
+ scoped to the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④⑤">RP ID</a> stated in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-rpid" id="ref-for-dom-publickeycredentialrequestoptions-rpid⑥">rpId</a></code>.</p>
     <li data-md>
-     <p>When <a href="#rp-op-verifying-assertion-step-rpid-hash">verifying the assertion</a>, expect that the <code><a data-link-type="dfn" href="#authdata-rpidhash" id="ref-for-authdata-rpidhash④">rpIdHash</a></code> MAY be the hash of the <var>AppID</var> instead of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④③">RP ID</a>.</p>
+     <p>When <a href="#rp-op-verifying-assertion-step-rpid-hash">verifying the assertion</a>, expect that the <code><a data-link-type="dfn" href="#authdata-rpidhash" id="ref-for-authdata-rpidhash④">rpIdHash</a></code> MAY be the hash of the <var>AppID</var> instead of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④⑥">RP ID</a>.</p>
    </ol>
    <p>This extension does not allow FIDO-compatible credentials to be created. Thus,
 credentials created with WebAuthn are not backwards compatible with the FIDO
 JavaScript APIs.</p>
    <p class="note" role="note"><span class="marker">Note:</span> <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsclientinputs-appid" id="ref-for-dom-authenticationextensionsclientinputs-appid②">appid</a></code> should be set to the AppID
-that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪②">Relying Party</a> <em>previously</em> used in the legacy FIDO APIs.
-This might not be the same as the result of translating the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪③">Relying Party</a>'s WebAuthn <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④④">RP ID</a> to the AppID format,
+that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪④">Relying Party</a> <em>previously</em> used in the legacy FIDO APIs.
+This might not be the same as the result of translating the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑤">Relying Party</a>'s WebAuthn <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④⑦">RP ID</a> to the AppID format,
 e.g., the previously used AppID may have been "https://accounts.example.com"
-but the currently used <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④⑤">RP ID</a> might be "example.com".</p>
+but the currently used <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④⑧">RP ID</a> might be "example.com".</p>
    <dl>
     <dt data-md>Extension identifier
     <dd data-md>
@@ -6924,13 +7045,13 @@ <h4 class="heading settled" data-level="10.1.1" id="sctn-appid-extension"><span
     <dd data-md>
      <ol>
       <li data-md>
-       <p>Let <var>facetId</var> be the result of passing the caller’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①⑦">origin</a> to the
+       <p>Let <var>facetId</var> be the result of passing the caller’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①⑧">origin</a> to the
 FIDO algorithm for <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-appid-and-facets-v2.0-id-20180227.html#determining-the-facetid-of-a-calling-application" id="ref-for-determining-the-facetid-of-a-calling-application①">determining the FacetID of a calling application</a>.</p>
       <li data-md>
        <p>Let <var>appId</var> be the extension input.</p>
       <li data-md>
        <p>Pass <var>facetId</var> and <var>appId</var> to the FIDO algorithm for <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-appid-and-facets-v2.0-id-20180227.html#determining-if-a-caller-s-facetid-is-authorized-for-an-appid" id="ref-for-determining-if-a-caller-s-facetid-is-authorized-for-an-appid①">determining if a
-caller’s FacetID is authorized for an AppID</a>. If that algorithm rejects <var>appId</var> then return a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror④">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②③">DOMException</a></code>.</p>
+caller’s FacetID is authorized for an AppID</a>. If that algorithm rejects <var>appId</var> then return a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror⑨">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②⑧">DOMException</a></code>.</p>
       <li data-md>
        <p>When <a href="#allowCredentialDescriptorListCreation">building allowCredentialDescriptorList</a>,
 if a U2F authenticator indicates that a credential is inapplicable (i.e. by
@@ -6941,7 +7062,7 @@ <h4 class="heading settled" data-level="10.1.1" id="sctn-appid-extension"><span
        <p>Let <var>output</var> be the Boolean value <code>false</code>.</p>
       <li data-md>
        <p>When <a href="#assertionCreationDataCreation">creating assertionCreationData</a>,
-if the <a data-link-type="dfn" href="#assertion" id="ref-for-assertion⑤">assertion</a> was created by a U2F authenticator with the U2F application parameter set to the SHA-256 hash of <var>appId</var> instead of the SHA-256 hash of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④⑥">RP ID</a>, set <var>output</var> to <code>true</code>.</p>
+if the <a data-link-type="dfn" href="#assertion" id="ref-for-assertion⑤">assertion</a> was created by a U2F authenticator with the U2F application parameter set to the SHA-256 hash of <var>appId</var> instead of the SHA-256 hash of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④⑨">RP ID</a>, set <var>output</var> to <code>true</code>.</p>
      </ol>
    </dl>
    <p class="note" role="note"><span class="marker">Note:</span> In practice, several implementations do not implement steps four and onward of the
@@ -6950,7 +7071,7 @@ <h4 class="heading settled" data-level="10.1.1" id="sctn-appid-extension"><span
    <dl>
     <dt data-md>Client extension output
     <dd data-md>
-     <p>Returns the value of <var>output</var>. If true, the <var>AppID</var> was used and thus, when <a href="#rp-op-verifying-assertion-step-rpid-hash">verifying the assertion</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪④">Relying Party</a> MUST expect the <code><a data-link-type="dfn" href="#authdata-rpidhash" id="ref-for-authdata-rpidhash⑤">rpIdHash</a></code> to be the hash of the <var>AppID</var>, not the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④⑦">RP ID</a>.</p>
+     <p>Returns the value of <var>output</var>. If true, the <var>AppID</var> was used and thus, when <a href="#rp-op-verifying-assertion-step-rpid-hash">verifying the assertion</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑥">Relying Party</a> MUST expect the <code><a data-link-type="dfn" href="#authdata-rpidhash" id="ref-for-authdata-rpidhash⑤">rpIdHash</a></code> to be the hash of the <var>AppID</var>, not the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤⓪">RP ID</a>.</p>
 <pre class="idl highlight def"><c- b>partial</c-> <c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-authenticationextensionsclientoutputs" id="ref-for-dictdef-authenticationextensionsclientoutputs⑤"><c- g>AuthenticationExtensionsClientOutputs</c-></a> {
   <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean⑦"><c- b>boolean</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsClientOutputs" data-dfn-type="dict-member" data-export data-type="boolean" id="dom-authenticationextensionsclientoutputs-appid"><code><c- g>appid</c-></code></dfn>;
 };
@@ -6966,8 +7087,8 @@ <h4 class="heading settled" data-level="10.1.1" id="sctn-appid-extension"><span
      <p>None.</p>
    </dl>
    <h4 class="heading settled" data-level="10.1.2" id="sctn-appid-exclude-extension"><span class="secno">10.1.2. </span><span class="content">FIDO AppID Exclusion Extension (appidExclude)</span><a class="self-link" href="#sctn-appid-exclude-extension"></a></h4>
-   <p>This registration extension allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑨">WebAuthn Relying Parties</a> to exclude authenticators that contain specified credentials that were created with the legacy FIDO U2F JavaScript API <a data-link-type="biblio" href="#biblio-fidou2fjavascriptapi" title="FIDO U2F JavaScript API">[FIDOU2FJavaScriptAPI]</a>.</p>
-   <p>During a transition from the FIDO U2F JavaScript API, a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑤">Relying Party</a> may have a population of users with legacy credentials already registered. The <a href="#sctn-appid-extension">appid</a> extension allows the sign-in flow to be transitioned smoothly but, when transitioning the registration flow, the <a href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials⑤">excludeCredentials</a> field will not be effective in excluding authenticators with legacy credentials because its contents are taken to be WebAuthn credentials. This extension directs <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤⓪">client platforms</a> to consider the contents of <a href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials⑥">excludeCredentials</a> as both WebAuthn and legacy FIDO credentials. Note that U2F key handles commonly use <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①④">base64url encoding</a> but must be decoded to their binary form when used in <a href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials⑦">excludeCredentials</a>.</p>
+   <p>This registration extension allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⓪">WebAuthn Relying Parties</a> to exclude authenticators that contain specified credentials that were created with the legacy FIDO U2F JavaScript API <a data-link-type="biblio" href="#biblio-fidou2fjavascriptapi" title="FIDO U2F JavaScript API">[FIDOU2FJavaScriptAPI]</a>.</p>
+   <p>During a transition from the FIDO U2F JavaScript API, a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑦">Relying Party</a> may have a population of users with legacy credentials already registered. The <a href="#sctn-appid-extension">appid</a> extension allows the sign-in flow to be transitioned smoothly but, when transitioning the registration flow, the <a href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials⑤">excludeCredentials</a> field will not be effective in excluding authenticators with legacy credentials because its contents are taken to be WebAuthn credentials. This extension directs <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤⓪">client platforms</a> to consider the contents of <a href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials⑥">excludeCredentials</a> as both WebAuthn and legacy FIDO credentials. Note that U2F key handles commonly use <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①④">base64url encoding</a> but must be decoded to their binary form when used in <a href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials⑦">excludeCredentials</a>.</p>
    <dl>
     <dt data-md>Extension identifier
     <dd data-md>
@@ -6990,14 +7111,14 @@ <h4 class="heading settled" data-level="10.1.2" id="sctn-appid-exclude-extension
        <p>Just after <a href="#CreateCred-DetermineRpId">establishing the RP ID</a> perform these steps:</p>
        <ol>
         <li data-md>
-         <p>Let <var>facetId</var> be the result of passing the caller’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①⑧">origin</a> to the FIDO algorithm
+         <p>Let <var>facetId</var> be the result of passing the caller’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①⑨">origin</a> to the FIDO algorithm
 for <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-appid-and-facets-v2.0-id-20180227.html#determining-the-facetid-of-a-calling-application" id="ref-for-determining-the-facetid-of-a-calling-application②">determining the FacetID of a calling application</a>.</p>
         <li data-md>
          <p>Let <var>appId</var> be the value of the extension input <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsclientinputs-appidexclude" id="ref-for-dom-authenticationextensionsclientinputs-appidexclude">appidExclude</a></code>.</p>
         <li data-md>
          <p>Pass <var>facetId</var> and <var>appId</var> to the FIDO algorithm for <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-appid-and-facets-v2.0-id-20180227.html#determining-if-a-caller-s-facetid-is-authorized-for-an-appid" id="ref-for-determining-if-a-caller-s-facetid-is-authorized-for-an-appid③">determining if a caller’s
 FacetID is authorized for an AppID</a>. If the latter algorithm rejects <var>appId</var> then
-return a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror⑤">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②④">DOMException</a></code> and terminate the <a href="#sctn-createCredential">creating a new credential</a> algorithm as well as these steps.</p>
+return a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror①⓪">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②⑨">DOMException</a></code> and terminate the <a href="#sctn-createCredential">creating a new credential</a> algorithm as well as these steps.</p>
          <p class="note" role="note"><span class="marker">Note:</span> In practice, several implementations do not implement steps four and onward of the algorithm for <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-appid-and-facets-v2.0-id-20180227.html#determining-if-a-caller-s-facetid-is-authorized-for-an-appid" id="ref-for-determining-if-a-caller-s-facetid-is-authorized-for-an-appid④">determining if a caller’s FacetID is authorized for an AppID</a>. Instead, in step three, the comparison on the host is relaxed to accept hosts on the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#same-site" id="ref-for-same-site①">same site</a>.</p>
         <li data-md>
          <p>Otherwise, continue with normal processing.</p>
@@ -7006,7 +7127,7 @@ <h4 class="heading settled" data-level="10.1.2" id="sctn-appid-exclude-extension
        <p>Just prior to <a href="#CreateCred-InvokeAuthnrMakeCred">invoking authenticatorMakeCredential</a> perform these steps:</p>
        <ol>
         <li data-md>
-         <p>If <var>authenticator</var> supports the U2F protocol <a data-link-type="biblio" href="#biblio-fido-u2f-message-formats" title="FIDO U2F Raw Message Formats">[FIDO-U2F-Message-Formats]</a>, then <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate②⓪">for each</a> <a href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor①④">credential descriptor</a> <var>C</var> in <var>excludeCredentialDescriptorList</var>:</p>
+         <p>If <var>authenticator</var> supports the U2F protocol <a data-link-type="biblio" href="#biblio-fido-u2f-message-formats" title="FIDO U2F Raw Message Formats">[FIDO-U2F-Message-Formats]</a>, then <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate②①">for each</a> <a href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor①④">credential descriptor</a> <var>C</var> in <var>excludeCredentialDescriptorList</var>:</p>
          <ol>
           <li data-md>
            <p>Check whether <var>C</var> was created using U2F on <var>authenticator</var> by sending a <code>U2F_AUTHENTICATE</code> message to <var>authenticator</var> whose "five parts" are set to the following values:</p>
@@ -7042,7 +7163,7 @@ <h4 class="heading settled" data-level="10.1.2" id="sctn-appid-exclude-extension
      </ol>
     <dt data-md>Client extension output
     <dd data-md>
-     <p>Returns the value <code>true</code> to indicate to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑥">Relying Party</a> that the extension was acted upon.</p>
+     <p>Returns the value <code>true</code> to indicate to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑧">Relying Party</a> that the extension was acted upon.</p>
 <pre class="idl highlight def"><c- b>partial</c-> <c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-authenticationextensionsclientoutputs" id="ref-for-dictdef-authenticationextensionsclientoutputs⑥"><c- g>AuthenticationExtensionsClientOutputs</c-></a> {
   <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean⑧"><c- b>boolean</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsClientOutputs" data-dfn-type="dict-member" data-export data-type="boolean" id="dom-authenticationextensionsclientoutputs-appidexclude"><code><c- g>appidExclude</c-></code></dfn>;
 };
@@ -7058,7 +7179,7 @@ <h4 class="heading settled" data-level="10.1.2" id="sctn-appid-exclude-extension
      <p>None.</p>
    </dl>
    <h4 class="heading settled" data-level="10.1.3" id="sctn-authenticator-credential-properties-extension"><span class="secno">10.1.3. </span><span class="content">Credential Properties Extension (<dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="credprops">credProps</dfn>)</span><a class="self-link" href="#sctn-authenticator-credential-properties-extension"></a></h4>
-   <p>This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑧">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension⑨">registration extension</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension⑨">authentication extension</a> facilitates reporting certain <a data-link-type="dfn" href="#credential-properties" id="ref-for-credential-properties③">credential properties</a> known by the <a data-link-type="dfn" href="#client" id="ref-for-client⑨③">client</a> to the requesting <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⓪">WebAuthn Relying Party</a> upon creation or use of a <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑥⑦">public key credential source</a>.</p>
+   <p>This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑧">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension⑨">registration extension</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension⑨">authentication extension</a> facilitates reporting certain <a data-link-type="dfn" href="#credential-properties" id="ref-for-credential-properties③">credential properties</a> known by the <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑤">client</a> to the requesting <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④①">WebAuthn Relying Party</a> upon creation or use of a <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑥⑦">public key credential source</a>.</p>
    <dl>
     <dt data-md>Extension identifier
     <dd data-md>
@@ -7068,7 +7189,7 @@ <h4 class="heading settled" data-level="10.1.3" id="sctn-authenticator-credentia
      <p><a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①⓪">Registration</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①⓪">authentication</a></p>
     <dt data-md>Client extension input
     <dd data-md>
-     <p>The Boolean value <code>true</code> to indicate that this extension is requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑦">Relying Party</a>.</p>
+     <p>The Boolean value <code>true</code> to indicate that this extension is requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑨">Relying Party</a>.</p>
 <pre class="idl highlight def"><c- b>partial</c-> <c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-authenticationextensionsclientinputs" id="ref-for-dictdef-authenticationextensionsclientinputs⑧"><c- g>AuthenticationExtensionsClientInputs</c-></a> {
     <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean⑨"><c- b>boolean</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsClientInputs" data-dfn-type="dict-member" data-export data-type="boolean" id="dom-authenticationextensionsclientinputs-credprops"><code><c- g>credProps</c-></code></dfn>;
 };
@@ -7102,29 +7223,29 @@ <h4 class="heading settled" data-level="10.1.3" id="sctn-authenticator-credentia
        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="CredentialPropertiesOutput" data-dfn-type="dict-member" data-export id="dom-credentialpropertiesoutput-rk"><code>rk</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①①">boolean</a></span>
        <dd data-md>
         <p>This OPTIONAL property, known abstractly as the <dfn class="dfn-paneled" data-dfn-for="CredentialPropertiesOutput" data-dfn-type="dfn" data-noexport id="credentialpropertiesoutput-resident-key-credential-property">resident key credential property</dfn>,
-is a Boolean value indicating whether the <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②⑦">PublicKeyCredential</a></code> returned as a result of a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑥">registration ceremony</a> is a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①⑤">client-side discoverable credential</a>.
+is a Boolean value indicating whether the <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②⑧">PublicKeyCredential</a></code> returned as a result of a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑥">registration ceremony</a> is a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①⑤">client-side discoverable credential</a>.
 If <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk③">rk</a></code> is <code>true</code>, the credential is a <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①⑤">discoverable credential</a>.
 If <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk④">rk</a></code> is <code>false</code>, the credential is a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential①②">server-side credential</a>.
 If <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk⑤">rk</a></code> is not present, it is not known whether the credential is a <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①⑥">discoverable credential</a> or a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential①③">server-side credential</a>.</p>
-        <p class="note" role="note"><span class="marker">Note:</span> some <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑥">authenticators</a> create <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①⑦">discoverable credentials</a> even when not requested by the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤①">client platform</a>. Because of this, <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤②">client platforms</a> may be forced to omit the <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk⑥">rk</a></code> property because they lack the assurance to be able to set it to <code>false</code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑧">Relying Parties</a> should assume that, if the <code>credProps</code> extension is supported, then <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤③">client platforms</a> will endeavour to populate the <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk⑦">rk</a></code> property. Therefore a missing <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk⑧">rk</a></code> indicates that the created credential is most likely a <a data-link-type="dfn" href="#non-discoverable-credential" id="ref-for-non-discoverable-credential④">non-discoverable credential</a>.</p>
+        <p class="note" role="note"><span class="marker">Note:</span> some <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑥">authenticators</a> create <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①⑦">discoverable credentials</a> even when not requested by the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤①">client platform</a>. Because of this, <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤②">client platforms</a> may be forced to omit the <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk⑥">rk</a></code> property because they lack the assurance to be able to set it to <code>false</code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⓪">Relying Parties</a> should assume that, if the <code>credProps</code> extension is supported, then <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤③">client platforms</a> will endeavour to populate the <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk⑦">rk</a></code> property. Therefore a missing <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk⑧">rk</a></code> indicates that the created credential is most likely a <a data-link-type="dfn" href="#non-discoverable-credential" id="ref-for-non-discoverable-credential④">non-discoverable credential</a>.</p>
        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="CredentialPropertiesOutput" data-dfn-type="dict-member" data-export id="dom-credentialpropertiesoutput-authenticatordisplayname"><code>authenticatorDisplayName</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-USVString" id="ref-for-idl-USVString⑤">USVString</a></span>
        <dd data-md>
         <p>This OPTIONAL property is a <a data-link-type="dfn" href="#human-palatability" id="ref-for-human-palatability⑦">human-palatable</a> description of the credential’s <a data-link-type="dfn" href="#public-key-credential-source-managing-authenticator" id="ref-for-public-key-credential-source-managing-authenticator①②">managing authenticator</a>,
 chosen by the user.</p>
-        <p>The <a data-link-type="dfn" href="#client" id="ref-for-client⑨④">client</a> MUST allow the user to choose this value.
+        <p>The <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑥">client</a> MUST allow the user to choose this value.
 That choice MAY be presented during the <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑦">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③③">authentication</a> ceremony or MAY be made available outside
-the ceremony, for example in client settings. The <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑤">client</a> MAY reuse the same value
-for multiple credentials with the same <a data-link-type="dfn" href="#public-key-credential-source-managing-authenticator" id="ref-for-public-key-credential-source-managing-authenticator①③">managing authenticator</a> across multiple <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑨">Relying Parties</a>.</p>
-        <p>The <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑥">client</a> MAY query the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑦">authenticator</a>, by some unspecified mechanism, for this
+the ceremony, for example in client settings. The <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑦">client</a> MAY reuse the same value
+for multiple credentials with the same <a data-link-type="dfn" href="#public-key-credential-source-managing-authenticator" id="ref-for-public-key-credential-source-managing-authenticator①③">managing authenticator</a> across multiple <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①①">Relying Parties</a>.</p>
+        <p>The <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑧">client</a> MAY query the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑦">authenticator</a>, by some unspecified mechanism, for this
 value. The <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑧">authenticator</a> MAY allow the user to configure the response to such a
 query. The <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑨">authenticator</a> vendor MAY provide a default response to such a query.
-The <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑦">client</a> MAY consider a user-configured response chosen by the user,
+The <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑨">client</a> MAY consider a user-configured response chosen by the user,
 and SHOULD allow the user to modify a vendor-provided default response.</p>
-        <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⓪">Relying Party</a> includes an <code><a data-link-type="abstract-op" href="#abstract-opdef-credential-record-authenticatordisplayname" id="ref-for-abstract-opdef-credential-record-authenticatordisplayname">authenticatorDisplayName</a></code> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#struct-item" id="ref-for-struct-item①②">item</a> in its <a data-link-type="dfn" href="#credential-record" id="ref-for-credential-record①⑧">credential records</a>,
-the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①①">Relying Party</a> MAY offer this <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-authenticatordisplayname" id="ref-for-dom-credentialpropertiesoutput-authenticatordisplayname④">authenticatorDisplayName</a></code> extension output,
+        <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①②">Relying Party</a> includes an <code><a data-link-type="abstract-op" href="#abstract-opdef-credential-record-authenticatordisplayname" id="ref-for-abstract-opdef-credential-record-authenticatordisplayname">authenticatorDisplayName</a></code> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#struct-item" id="ref-for-struct-item①②">item</a> in its <a data-link-type="dfn" href="#credential-record" id="ref-for-credential-record①⑧">credential records</a>,
+the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①③">Relying Party</a> MAY offer this <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-authenticatordisplayname" id="ref-for-dom-credentialpropertiesoutput-authenticatordisplayname④">authenticatorDisplayName</a></code> extension output,
 if present, as a default value for the <code><a data-link-type="abstract-op" href="#abstract-opdef-credential-record-authenticatordisplayname" id="ref-for-abstract-opdef-credential-record-authenticatordisplayname①">authenticatorDisplayName</a></code> of the new <a data-link-type="dfn" href="#credential-record" id="ref-for-credential-record①⑨">credential record</a> it stores after a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑧">registration ceremony</a>.</p>
         <p>If the <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-authenticatordisplayname" id="ref-for-dom-credentialpropertiesoutput-authenticatordisplayname⑤">authenticatorDisplayName</a></code> extension output from an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③④">authentication ceremony</a> is different from the <code><a data-link-type="abstract-op" href="#abstract-opdef-credential-record-authenticatordisplayname" id="ref-for-abstract-opdef-credential-record-authenticatordisplayname②">authenticatorDisplayName</a></code> of the <a data-link-type="dfn" href="#credential-record" id="ref-for-credential-record②⓪">credential record</a>,
-the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①②">Relying Party</a> MAY offer the user to update the <code><a data-link-type="abstract-op" href="#abstract-opdef-credential-record-authenticatordisplayname" id="ref-for-abstract-opdef-credential-record-authenticatordisplayname③">authenticatorDisplayName</a></code> of the <a data-link-type="dfn" href="#credential-record" id="ref-for-credential-record②①">credential record</a>.</p>
+the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①④">Relying Party</a> MAY offer the user to update the <code><a data-link-type="abstract-op" href="#abstract-opdef-credential-record-authenticatordisplayname" id="ref-for-abstract-opdef-credential-record-authenticatordisplayname③">authenticatorDisplayName</a></code> of the <a data-link-type="dfn" href="#credential-record" id="ref-for-credential-record②①">credential record</a>.</p>
       </dl>
      </div>
     <dt data-md>Authenticator extension input
@@ -7138,11 +7259,11 @@ <h4 class="heading settled" data-level="10.1.3" id="sctn-authenticator-credentia
      <p>None.</p>
    </dl>
    <h4 class="heading settled" data-level="10.1.4" id="prf-extension"><span class="secno">10.1.4. </span><span class="content">Pseudo-random function extension (<dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="prf">prf</dfn>)</span><a class="self-link" href="#prf-extension"></a></h4>
-   <p>This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑨">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①①">registration extension</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①①">authentication extension</a> allows a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①③">Relying Party</a> to evaluate outputs from a pseudo-random function (PRF) associated with a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⑨">credential</a>. The PRFs provided by this extension map from <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource①⓪">BufferSource</a></code>s of any length to 32-byte <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource①①">BufferSource</a></code>s.</p>
+   <p>This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑨">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①①">registration extension</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①①">authentication extension</a> allows a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑤">Relying Party</a> to evaluate outputs from a pseudo-random function (PRF) associated with a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⑨">credential</a>. The PRFs provided by this extension map from <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource①⓪">BufferSource</a></code>s of any length to 32-byte <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource①①">BufferSource</a></code>s.</p>
    <p>As a motivating example, PRF outputs could be used as symmetric keys to encrypt user data. Such encrypted data would be inaccessible without the ability to get assertions from the associated <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential②⓪">credential</a>. By using the provision below to evaluate the PRF at two inputs in a single <a data-link-type="dfn" href="#assertion" id="ref-for-assertion⑥">assertion</a> operation, the encryption key could be periodically rotated during <a data-link-type="dfn" href="#assertion" id="ref-for-assertion⑦">assertions</a> by choosing a fresh, random input and reencrypting under the new output. If the evaluation inputs are unpredictable then even an attacker who could satisfy <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤⓪">user verification</a>, and who had time-limited access to the authenticator, could not learn the encryption key without also knowing the correct PRF input.</p>
    <p>This extension is implemented on top of the <a data-link-type="biblio" href="#biblio-fido-ctap" title="Client to Authenticator Protocol (CTAP)">[FIDO-CTAP]</a> <code>hmac-secret</code> extension. It is a separate <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension①⓪">client extension</a> because <code>hmac-secret</code> requires that inputs and outputs be encrypted in a manner that only the user agent can perform, and to provide separation between uses by WebAuthn and any uses by the underlying platform. This separation is achieved by hashing the provided PRF inputs with a context string to prevent evaluation of the PRFs for arbitrary inputs.</p>
    <p>The <code>hmac-secret</code> extension provides two PRFs per credential: one which is used for requests where <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤①">user verification</a> is performed and another for all other requests. This extension only exposes a single PRF per credential and, when implementing on top of <code>hmac-secret</code>, that PRF MUST be the one used for when <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤②">user verification</a> is performed. This overrides the <code class="idl"><a data-link-type="idl" href="#enumdef-userverificationrequirement" id="ref-for-enumdef-userverificationrequirement⑥">UserVerificationRequirement</a></code> if neccessary.</p>
-   <p class="note" role="note"><span class="marker">Note:</span> this extension may be implemented for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⓪">authenticators</a> that do not use <a data-link-type="biblio" href="#biblio-fido-ctap" title="Client to Authenticator Protocol (CTAP)">[FIDO-CTAP]</a> so long as the behavior observed by a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①④">Relying Party</a> is identical.</p>
+   <p class="note" role="note"><span class="marker">Note:</span> this extension may be implemented for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⓪">authenticators</a> that do not use <a data-link-type="biblio" href="#biblio-fido-ctap" title="Client to Authenticator Protocol (CTAP)">[FIDO-CTAP]</a> so long as the behavior observed by a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑥">Relying Party</a> is identical.</p>
    <dl>
     <dt data-md>Extension identifier
     <dd data-md>
@@ -7180,7 +7301,7 @@ <h4 class="heading settled" data-level="10.1.4" id="prf-extension"><span class="
     <dd data-md>
      <ol>
       <li data-md>
-       <p>If <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsprfinputs-evalbycredential" id="ref-for-dom-authenticationextensionsprfinputs-evalbycredential①">evalByCredential</a></code> is present, return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②⑤">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror③">NotSupportedError</a></code>”.</p>
+       <p>If <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsprfinputs-evalbycredential" id="ref-for-dom-authenticationextensionsprfinputs-evalbycredential①">evalByCredential</a></code> is present, return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException③⓪">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror③">NotSupportedError</a></code>”.</p>
       <li data-md>
        <p>Set <code>hmac-secret</code> to <code>true</code> in the authenticator extensions input.</p>
       <li data-md>
@@ -7200,9 +7321,9 @@ <h4 class="heading settled" data-level="10.1.4" id="prf-extension"><span class="
     <dd data-md>
      <ol>
       <li data-md>
-       <p>If <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsprfinputs-evalbycredential" id="ref-for-dom-authenticationextensionsprfinputs-evalbycredential②">evalByCredential</a></code> is not empty but <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②④">allowCredentials</a></code> is empty, return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②⑥">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror④">NotSupportedError</a></code>”.</p>
+       <p>If <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsprfinputs-evalbycredential" id="ref-for-dom-authenticationextensionsprfinputs-evalbycredential②">evalByCredential</a></code> is not empty but <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②④">allowCredentials</a></code> is empty, return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException③①">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror④">NotSupportedError</a></code>”.</p>
       <li data-md>
-       <p>If any <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-key" id="ref-for-map-key">key</a> in <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsprfinputs-evalbycredential" id="ref-for-dom-authenticationextensionsprfinputs-evalbycredential③">evalByCredential</a></code> is the empty string, or is not a valid <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①⑥">base64url encoding</a>, or does not equal the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-id" id="ref-for-dom-publickeycredentialdescriptor-id①⑤">id</a></code> of some element of <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⑤">allowCredentials</a></code> after performing <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①⑦">base64url decoding</a>, then return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②⑦">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#syntaxerror" id="ref-for-syntaxerror">SyntaxError</a></code>”.</p>
+       <p>If any <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-key" id="ref-for-map-key">key</a> in <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsprfinputs-evalbycredential" id="ref-for-dom-authenticationextensionsprfinputs-evalbycredential③">evalByCredential</a></code> is the empty string, or is not a valid <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①⑥">base64url encoding</a>, or does not equal the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-id" id="ref-for-dom-publickeycredentialdescriptor-id①⑤">id</a></code> of some element of <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⑤">allowCredentials</a></code> after performing <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①⑦">base64url decoding</a>, then return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException③②">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#syntaxerror" id="ref-for-syntaxerror">SyntaxError</a></code>”.</p>
       <li data-md>
        <p>Initialize the <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsclientoutputs-prf" id="ref-for-dom-authenticationextensionsclientoutputs-prf">prf</a></code> extension output to an empty dictionary.</p>
       <li data-md>
@@ -7228,7 +7349,7 @@ <h4 class="heading settled" data-level="10.1.4" id="prf-extension"><span class="
      </ol>
     <dt data-md>Authenticator extension input / processing / output
     <dd data-md>
-     <p><a data-link-type="dfn" href="#prf" id="ref-for-prf">This extension</a> uses the <a data-link-type="biblio" href="#biblio-fido-ctap" title="Client to Authenticator Protocol (CTAP)">[FIDO-CTAP]</a> <code>hmac-secret</code> extension when communicating with the authenticator. It thus does not specify any direct authenticator interaction for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑤">Relying Parties</a>.</p>
+     <p><a data-link-type="dfn" href="#prf" id="ref-for-prf">This extension</a> uses the <a data-link-type="biblio" href="#biblio-fido-ctap" title="Client to Authenticator Protocol (CTAP)">[FIDO-CTAP]</a> <code>hmac-secret</code> extension when communicating with the authenticator. It thus does not specify any direct authenticator interaction for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑦">Relying Parties</a>.</p>
     <dt data-md>Client extension output
     <dd data-md>
 <pre class="idl highlight def"><c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-authenticationextensionsprfoutputs"><code><c- g>AuthenticationExtensionsPRFOutputs</c-></code></dfn> {
@@ -7252,9 +7373,9 @@ <h4 class="heading settled" data-level="10.1.4" id="prf-extension"><span class="
      </div>
    </dl>
    <h4 class="heading settled" data-level="10.1.5" id="sctn-large-blob-extension"><span class="secno">10.1.5. </span><span class="content">Large blob storage extension (<dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="largeblob">largeBlob</dfn>)</span><a class="self-link" href="#sctn-large-blob-extension"></a></h4>
-   <p>This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension①①">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①④">registration extension</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①④">authentication extension</a> allows a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑥">Relying Party</a> to store opaque data associated with a credential. Since <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④③">authenticators</a> can only store small amounts of data, and most <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑦">Relying Parties</a> are online services that can store arbitrary amounts of state for a user, this is only useful in specific cases. For example, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑧">Relying Party</a> might wish to issue certificates rather than run a centralised authentication service.</p>
-   <p class="note" role="note"><span class="marker">Note:</span> <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑨">Relying Parties</a> can assume that the opaque data will be compressed when being written to a space-limited device and so need not compress it themselves.</p>
-   <p>Since a certificate system needs to sign over the public key of the credential, and that public key is only available after creation, this extension does not add an ability to write blobs in the <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①⑤">registration</a> context. However, <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⓪">Relying Parties</a> SHOULD use the <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①⑥">registration extension</a> when creating the credential if they wish to later use the <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①⑤">authentication extension</a>.</p>
+   <p>This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension①①">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①④">registration extension</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①④">authentication extension</a> allows a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑧">Relying Party</a> to store opaque data associated with a credential. Since <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④③">authenticators</a> can only store small amounts of data, and most <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑨">Relying Parties</a> are online services that can store arbitrary amounts of state for a user, this is only useful in specific cases. For example, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⓪">Relying Party</a> might wish to issue certificates rather than run a centralised authentication service.</p>
+   <p class="note" role="note"><span class="marker">Note:</span> <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②①">Relying Parties</a> can assume that the opaque data will be compressed when being written to a space-limited device and so need not compress it themselves.</p>
+   <p>Since a certificate system needs to sign over the public key of the credential, and that public key is only available after creation, this extension does not add an ability to write blobs in the <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①⑤">registration</a> context. However, <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②②">Relying Parties</a> SHOULD use the <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①⑥">registration extension</a> when creating the credential if they wish to later use the <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①⑤">authentication extension</a>.</p>
    <p>Since certificates are sizable relative to the storage capabilities of typical authenticators, user agents SHOULD consider what indications and confirmations are suitable to best guide the user in allocating this limited resource and prevent abuse.</p>
    <p class="note" role="note"><span class="marker">Note:</span> In order to interoperate, user agents storing large blobs on authenticators using <a data-link-type="biblio" href="#biblio-fido-ctap" title="Client to Authenticator Protocol (CTAP)">[FIDO-CTAP]</a> are expected to use the provisions detailed in that specification for storing <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.1-ps-20210615/fido-client-to-authenticator-protocol-v2.1-ps-errata-20220621.html#authenticatorLargeBlobs" id="ref-for-authenticatorLargeBlobs">large, per-credential blobs</a>.</p>
    <p class="note" role="note"><span class="marker">Note:</span> <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators②③">Roaming authenticators</a> that use <a data-link-type="biblio" href="#biblio-fido-ctap" title="Client to Authenticator Protocol (CTAP)">[FIDO-CTAP]</a> as their cross-platform transport protocol only support this <a data-link-type="dfn" href="#largeblob" id="ref-for-largeblob">Large Blob</a> extension for <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①⑧">discoverable credentials</a>,
@@ -7291,10 +7412,10 @@ <h4 class="heading settled" data-level="10.1.5" id="sctn-large-blob-extension"><
         <p>A DOMString that takes one of the values of <code class="idl"><a data-link-type="idl" href="#enumdef-largeblobsupport" id="ref-for-enumdef-largeblobsupport">LargeBlobSupport</a></code>. (See <a href="#sct-domstring-backwards-compatibility">§ 2.1.1 Enumerations as DOMString types</a>.) Only valid during <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①⑧">registration</a>.</p>
        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsLargeBlobInputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionslargeblobinputs-read"><code>read</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①⑤">boolean</a></span>
        <dd data-md>
-        <p>A boolean that indicates that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②①">Relying Party</a> would like to fetch the previously-written blob associated with the asserted credential. Only valid during <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①⑦">authentication</a>.</p>
+        <p>A boolean that indicates that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②③">Relying Party</a> would like to fetch the previously-written blob associated with the asserted credential. Only valid during <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①⑦">authentication</a>.</p>
        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsLargeBlobInputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionslargeblobinputs-write"><code>write</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource①⑤">BufferSource</a></span>
        <dd data-md>
-        <p>An opaque byte string that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②②">Relying Party</a> wishes to store with the existing credential. Only valid during <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①⑧">authentication</a>.</p>
+        <p>An opaque byte string that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②④">Relying Party</a> wishes to store with the existing credential. Only valid during <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①⑧">authentication</a>.</p>
       </dl>
      </div>
     <dt data-md>Client extension processing (<a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①⑨">registration</a>)
@@ -7304,7 +7425,7 @@ <h4 class="heading settled" data-level="10.1.5" id="sctn-large-blob-extension"><
        <p>If <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-read" id="ref-for-dom-authenticationextensionslargeblobinputs-read①">read</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-write" id="ref-for-dom-authenticationextensionslargeblobinputs-write①">write</a></code> is present:</p>
        <ol>
         <li data-md>
-         <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②⑧">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror⑤">NotSupportedError</a></code>”.</p>
+         <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException③③">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror⑤">NotSupportedError</a></code>”.</p>
        </ol>
       <li data-md>
        <p>If <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-support" id="ref-for-dom-authenticationextensionslargeblobinputs-support①">support</a></code> is present and has the value <code class="idl"><a data-link-type="idl" href="#dom-largeblobsupport-required" id="ref-for-dom-largeblobsupport-required">required</a></code>:</p>
@@ -7316,7 +7437,7 @@ <h4 class="heading settled" data-level="10.1.5" id="sctn-large-blob-extension"><
    The <code class="idl"><a data-link-type="idl" href="#dictdef-authenticationextensionslargebloboutputs" id="ref-for-dictdef-authenticationextensionslargebloboutputs">AuthenticationExtensionsLargeBlobOutputs</a></code> will be abandoned if no satisfactory authenticator becomes available.</p>
         <li data-md>
          <p>If a <a data-link-type="dfn" href="#create-candidate-authenticator" id="ref-for-create-candidate-authenticator">candidate authenticator</a> becomes available (<a href="#CreateCred-async-loop">step 21</a> of <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-create-slot" id="ref-for-dom-publickeycredential-create-slot①①">[[Create]]()</a></code>) then,
-  before evaluating any <code><var>options</var></code>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue①⑨">continue</a> (i.e. ignore the <a data-link-type="dfn" href="#create-candidate-authenticator" id="ref-for-create-candidate-authenticator①">candidate authenticator</a>)
+  before evaluating any <code><var>options</var></code>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue②③">continue</a> (i.e. ignore the <a data-link-type="dfn" href="#create-candidate-authenticator" id="ref-for-create-candidate-authenticator①">candidate authenticator</a>)
   if the <a data-link-type="dfn" href="#create-candidate-authenticator" id="ref-for-create-candidate-authenticator②">candidate authenticator</a> is not capable of storing large blobs.</p>
        </ol>
       <li data-md>
@@ -7333,13 +7454,13 @@ <h4 class="heading settled" data-level="10.1.5" id="sctn-large-blob-extension"><
        <p>If <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-support" id="ref-for-dom-authenticationextensionslargeblobinputs-support③">support</a></code> is present:</p>
        <ol>
         <li data-md>
-         <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②⑨">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror⑥">NotSupportedError</a></code>”.</p>
+         <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException③④">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror⑥">NotSupportedError</a></code>”.</p>
        </ol>
       <li data-md>
        <p>If both <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-read" id="ref-for-dom-authenticationextensionslargeblobinputs-read②">read</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-write" id="ref-for-dom-authenticationextensionslargeblobinputs-write②">write</a></code> are present:</p>
        <ol>
         <li data-md>
-         <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException③⓪">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror⑦">NotSupportedError</a></code>”.</p>
+         <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException③⑤">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror⑦">NotSupportedError</a></code>”.</p>
        </ol>
       <li data-md>
        <p>If <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-read" id="ref-for-dom-authenticationextensionslargeblobinputs-read③">read</a></code> is present and has the value <code>true</code>:</p>
@@ -7359,7 +7480,7 @@ <h4 class="heading settled" data-level="10.1.5" id="sctn-large-blob-extension"><
          <p>If <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⑥">allowCredentials</a></code> does not contain exactly one element:</p>
          <ol>
           <li data-md>
-           <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException③①">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror⑧">NotSupportedError</a></code>”.</p>
+           <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException③⑥">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror⑧">NotSupportedError</a></code>”.</p>
          </ol>
         <li data-md>
          <p>If the <a href="#sctn-getAssertion">assertion</a> operation is successful, attempt to store the contents of <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-write" id="ref-for-dom-authenticationextensionslargeblobinputs-write④">write</a></code> on the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑤">authenticator</a>, associated with the indicated credential.</p>
@@ -7394,18 +7515,18 @@ <h4 class="heading settled" data-level="10.1.5" id="sctn-large-blob-extension"><
      </div>
     <dt data-md>Authenticator extension processing
     <dd data-md>
-     <p><a data-link-type="dfn" href="#largeblob" id="ref-for-largeblob①">This extension</a> directs the user-agent to cause the large blob to be stored on, or retrieved from, the authenticator. It thus does not specify any direct authenticator interaction for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②③">Relying Parties</a>.</p>
+     <p><a data-link-type="dfn" href="#largeblob" id="ref-for-largeblob①">This extension</a> directs the user-agent to cause the large blob to be stored on, or retrieved from, the authenticator. It thus does not specify any direct authenticator interaction for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑤">Relying Parties</a>.</p>
    </dl>
    <h3 class="heading settled" data-level="10.2" id="sctn-defined-authenticator-extensions"><span class="secno">10.2. </span><span class="content">Authenticator Extensions</span><a class="self-link" href="#sctn-defined-authenticator-extensions"></a></h3>
    <p>This section defines extensions that are both <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension①②">client extensions</a> and <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension①②">authenticator extensions</a>.</p>
    <h4 class="heading settled" data-level="10.2.1" id="sctn-supplemental-public-keys-extension"><span class="secno">10.2.1. </span><span class="content">Supplemental public keys extension (<dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="supplementalpubkeys">supplementalPubKeys</dfn>)</span><a class="self-link" href="#sctn-supplemental-public-keys-extension"></a></h4>
-   <p>This <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension①③">authenticator</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension②①">registration extension</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension②⓪">authentication extension</a> provides a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②④">Relying Party</a> with additional public key(s) for credentials. This is done by creating <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential③">user credential</a>-specific key pairs on the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑦">authenticator</a>, when required key pairs do not already exist for the <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential④">user credential</a> being created or exercised, and returning these supplemental keys (along with signatures by them) to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑤">Relying Party</a>. This is done each time this <a data-link-type="dfn" href="#supplementalpubkeys" id="ref-for-supplementalpubkeys③">supplementalPubKeys</a> extension is included with either a <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③⑤">navigator.credentials.create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⑨">navigator.credentials.get()</a></code> call.</p>
+   <p>This <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension①③">authenticator</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension②①">registration extension</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension②⓪">authentication extension</a> provides a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑥">Relying Party</a> with additional public key(s) for credentials. This is done by creating <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential③">user credential</a>-specific key pairs on the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑦">authenticator</a>, when required key pairs do not already exist for the <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential④">user credential</a> being created or exercised, and returning these supplemental keys (along with signatures by them) to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑦">Relying Party</a>. This is done each time this <a data-link-type="dfn" href="#supplementalpubkeys" id="ref-for-supplementalpubkeys③">supplementalPubKeys</a> extension is included with either a <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③⑤">navigator.credentials.create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⑨">navigator.credentials.get()</a></code> call.</p>
    <p>If the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑧">authenticator</a> is incapable of generating a supplemental key pair, or the registration or authentication operation fails for any reason, that key pair is omitted from the output. If no supplemental key pairs remain then this extension is ignored. In this case, there is no <a data-link-type="dfn" href="#supplementalpubkeys" id="ref-for-supplementalpubkeys④">supplementalPubKeys</a> extension output generated.</p>
    <p>Supplemental keys are not <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential⑤">user credentials</a> and they do not have their own <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④①">credential IDs</a>. Instead, any returned keys are a contextual attribute of their associated <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential⑥">user credential</a>. That is, when that <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential⑦">user credential</a> is used—along with the <a data-link-type="dfn" href="#supplementalpubkeys" id="ref-for-supplementalpubkeys⑤">supplementalPubKeys</a> extension—on a particular <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑨">authenticator</a>, a particular set of supplemental keys are returned by the extension, along with signatures demonstrating proof-of-possession of those keys.</p>
    <p>Supplemental keys never have a scope that is larger than the <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential⑧">user credential</a>. That is, they are never shared between any two <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential⑨">user credentials</a> and can never be used to link two <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential①⓪">user credentials</a> together. They only communicate continuity of some property of their associated <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential①①">user credential</a>.</p>
    <h5 class="heading settled" data-level="10.2.1.1" id="sctn-supplemental-public-keys-extension-usage"><span class="secno">10.2.1.1. </span><span class="content">Relying Party Usage</span><a class="self-link" href="#sctn-supplemental-public-keys-extension-usage"></a></h5>
-   <p>This extension is intended for use by those <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑥">Relying Parties</a> employing risk-analysis systems informing their sign-in decisions. This extension signals the continuity of some property <i>when used consistently</i> with both <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③⑥">navigator.credentials.create()</a></code> and <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get④⓪">navigator.credentials.get()</a></code> operations. The property being signaled depends on the scope of the supplemental key and its <a data-link-type="dfn" href="#attestation" id="ref-for-attestation②⑤">attestation</a> statement, if any. The clearest example of a supplemental key is one that is device-bound. Repeated observation of a device-bound supplemental key indicates that a credential is being used repeatedly from the same device. (Which cannot be otherwise assumed in the case of <a data-link-type="dfn" href="#backup-eligible" id="ref-for-backup-eligible②">backup eligible</a> credentials.) But supplemental keys with wider scopes are also defined and the exact properties that they communicate depend on the attestation included along with them.</p>
-   <p>When a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑦">Relying Party</a> uses the <code>supplementalPubKeys</code> extension with a <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③⑦">create()</a></code> call to create a new <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential①②">user credential</a>, a signature by one or more new supplemental keys may be returned along with the new supplemental public keys themselves. For the sake of example, assume that a single supplemental public key is returned, called “SPK1”. For as long as the <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential①③">user credential</a> is exercised within the scope of the supplemental key, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑧">Relying Party</a>'s subsequent <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get④①">get()</a></code> operations for that credential will likely generate <a data-link-type="dfn" href="#assertion" id="ref-for-assertion①⓪">assertions</a> including further signatures by “SPK1”.</p>
+   <p>This extension is intended for use by those <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑧">Relying Parties</a> employing risk-analysis systems informing their sign-in decisions. This extension signals the continuity of some property <i>when used consistently</i> with both <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③⑥">navigator.credentials.create()</a></code> and <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get④⓪">navigator.credentials.get()</a></code> operations. The property being signaled depends on the scope of the supplemental key and its <a data-link-type="dfn" href="#attestation" id="ref-for-attestation②⑤">attestation</a> statement, if any. The clearest example of a supplemental key is one that is device-bound. Repeated observation of a device-bound supplemental key indicates that a credential is being used repeatedly from the same device. (Which cannot be otherwise assumed in the case of <a data-link-type="dfn" href="#backup-eligible" id="ref-for-backup-eligible②">backup eligible</a> credentials.) But supplemental keys with wider scopes are also defined and the exact properties that they communicate depend on the attestation included along with them.</p>
+   <p>When a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑨">Relying Party</a> uses the <code>supplementalPubKeys</code> extension with a <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③⑦">create()</a></code> call to create a new <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential①②">user credential</a>, a signature by one or more new supplemental keys may be returned along with the new supplemental public keys themselves. For the sake of example, assume that a single supplemental public key is returned, called “SPK1”. For as long as the <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential①③">user credential</a> is exercised within the scope of the supplemental key, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⓪">Relying Party</a>'s subsequent <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get④①">get()</a></code> operations for that credential will likely generate <a data-link-type="dfn" href="#assertion" id="ref-for-assertion①⓪">assertions</a> including further signatures by “SPK1”.</p>
    <p>The credential may move beyond the scope of that supplemental key (for example, by being exported and imported elsewhere, if <a data-link-type="dfn" href="#backup-eligible" id="ref-for-backup-eligible③">backup eligible</a>) and, if used in this new domain, the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get④②">get()</a></code> operation will return a <i>new</i> supplemental key, SPK2, and its signature. Subsequent <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get④③">get()</a></code> operations may observe either SPK1 or SPK2, depending on the context in which the <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential①④">user credential</a> is being used.</p>
    <p>A usage example is thus:</p>
    <blockquote>
@@ -7415,7 +7536,7 @@ <h5 class="heading settled" data-level="10.2.1.1" id="sctn-supplemental-public-k
    <blockquote>
     <p>Say that a sign-in request appears at a website along with some geolocation signal that has not been seen for this <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⑥">user account</a> before, and is outside of the typical usage hours observed for the account. The risk may be deemed high enough not to allow the request, even with an assertion by a <a data-link-type="dfn" href="#multi-device-credential" id="ref-for-multi-device-credential⑧">multi-device credential</a> on its own. But if a signature from a supplemental key that is device-bound, and that is <i>well established</i> for this user can also be presented, then that may tip the balance.</p>
    </blockquote>
-   <p>The weight that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑨">Relying Parties</a> give to the presence of a signature from a supplemental key may be based on information learned from its optional attestation. An attestation can indicate the level of protection enjoyed by a hardware-bound key, or the policies for other types of supplemental key.</p>
+   <p>The weight that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③①">Relying Parties</a> give to the presence of a signature from a supplemental key may be based on information learned from its optional attestation. An attestation can indicate the level of protection enjoyed by a hardware-bound key, or the policies for other types of supplemental key.</p>
    <h5 class="heading settled" data-level="10.2.1.2" id="sctn-supplemental-public-keys-extension-definition"><span class="secno">10.2.1.2. </span><span class="content">Extension Definition</span><a class="self-link" href="#sctn-supplemental-public-keys-extension-definition"></a></h5>
    <dl>
     <dt data-md>Extension identifier
@@ -7440,15 +7561,15 @@ <h5 class="heading settled" data-level="10.2.1.2" id="sctn-supplemental-public-k
       <dl>
        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsSupplementalPubKeysInputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionssupplementalpubkeysinputs-scopes"><code>scopes</code></dfn>, <span> of type sequence&lt;<a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑦②">DOMString</a>></span>
        <dd data-md>
-        <p>This required member MUST be non-empty. It specifies the scopes of supplemental public keys that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⓪">Relying Party</a> requests. Values are taken from the CDDL below (i.e., currently defined values are <code>provider</code> and <code>device</code>); authenticators silently ignore unrecognized values. Specifying the scopes that a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③①">Relying Party</a> can use allows an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⓪">authenticator</a> to avoid the work of generating superfluous supplemental keys.</p>
+        <p>This required member MUST be non-empty. It specifies the scopes of supplemental public keys that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③②">Relying Party</a> requests. Values are taken from the CDDL below (i.e., currently defined values are <code>provider</code> and <code>device</code>); authenticators silently ignore unrecognized values. Specifying the scopes that a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③③">Relying Party</a> can use allows an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⓪">authenticator</a> to avoid the work of generating superfluous supplemental keys.</p>
        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsSupplementalPubKeysInputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionssupplementalpubkeysinputs-attestation"><code>attestation</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑦③">DOMString</a>, defaulting to <code>"indirect"</code></span>
        <dd data-md>
-        <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③②">Relying Party</a> MAY use this OPTIONAL member to specify a preference regarding <a data-link-type="dfn" href="#attestation-conveyance" id="ref-for-attestation-conveyance④">attestation conveyance</a>.
+        <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③④">Relying Party</a> MAY use this OPTIONAL member to specify a preference regarding <a data-link-type="dfn" href="#attestation-conveyance" id="ref-for-attestation-conveyance④">attestation conveyance</a>.
 Its value SHOULD be a member of <code class="idl"><a data-link-type="idl" href="#enumdef-attestationconveyancepreference" id="ref-for-enumdef-attestationconveyancepreference④">AttestationConveyancePreference</a></code>. <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤④">Client platforms</a> MUST ignore unknown values, treating an unknown value as if the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists⑧">member does not exist</a>.</p>
         <p>The default value is <code class="idl"><a data-link-type="idl" href="#dom-attestationconveyancepreference-indirect" id="ref-for-dom-attestationconveyancepreference-indirect②">indirect</a></code>.</p>
        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsSupplementalPubKeysInputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionssupplementalpubkeysinputs-attestationformats"><code>attestationFormats</code></dfn>, <span> of type sequence&lt;<a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑦④">DOMString</a>>, defaulting to <code>[]</code></span>
        <dd data-md>
-        <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③③">Relying Party</a> MAY use this OPTIONAL member to specify a preference regarding the <a data-link-type="dfn" href="#attestation" id="ref-for-attestation②⑥">attestation</a> statement format used by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤①">authenticator</a>.
+        <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑤">Relying Party</a> MAY use this OPTIONAL member to specify a preference regarding the <a data-link-type="dfn" href="#attestation" id="ref-for-attestation②⑥">attestation</a> statement format used by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤①">authenticator</a>.
 Values SHOULD be taken from the IANA "WebAuthn Attestation Statement Format Identifiers" registry <a data-link-type="biblio" href="#biblio-iana-webauthn-registries" title="Web Authentication (WebAuthn) registries">[IANA-WebAuthn-Registries]</a> established by <a data-link-type="biblio" href="#biblio-rfc8809" title="Registries for Web Authentication (WebAuthn)">[RFC8809]</a>.
 Values are ordered from most preferable to least preferable.
 This parameter is advisory and the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤②">authenticator</a> MAY use an attestation statement not enumerated in this parameter.</p>
@@ -7569,7 +7690,7 @@ <h5 class="heading settled" data-level="10.2.1.2" id="sctn-supplemental-public-k
       <li data-md>
        <p>Create or select the <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑥⑧">public key credential source</a> as usual (see <a href="#sctn-op-make-cred">§ 6.3.2 The authenticatorMakeCredential Operation</a>, or <a href="#sctn-op-get-assertion">§ 6.3.3 The authenticatorGetAssertion Operation</a> as appropriate).</p>
       <li data-md>
-       <p>Let <var>scopes</var> be the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set⑦">set</a> of all supplemental public key scopes that the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤③">authenticator</a> supports. Update <var>scopes</var> to be the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-intersection" id="ref-for-set-intersection">intersection</a> of itself and <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionssupplementalpubkeysinputs-scopes" id="ref-for-dom-authenticationextensionssupplementalpubkeysinputs-scopes①">scopes</a></code>. If <var>scopes</var> is empty, terminate these processing steps with no extension output.</p>
+       <p>Let <var>scopes</var> be the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set⑧">set</a> of all supplemental public key scopes that the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤③">authenticator</a> supports. Update <var>scopes</var> to be the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-intersection" id="ref-for-set-intersection">intersection</a> of itself and <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionssupplementalpubkeysinputs-scopes" id="ref-for-dom-authenticationextensionssupplementalpubkeysinputs-scopes①">scopes</a></code>. If <var>scopes</var> is empty, terminate these processing steps with no extension output.</p>
       <li data-md>
        <p>Let <var>spks</var> and <var>spkSigs</var> be empty arrays.</p>
       <li data-md>
@@ -7590,7 +7711,7 @@ <h5 class="heading settled" data-level="10.2.1.2" id="sctn-supplemental-public-k
            <p><var>attFormat</var> is an <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format①⑨">attestation statement format</a> appropriate for this <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⑤">authenticator</a> based on <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionssupplementalpubkeysinputs-attestationformats" id="ref-for-dom-authenticationextensionssupplementalpubkeysinputs-attestationformats①">attestationFormats</a></code>, and <var>attAaguid</var> is the corresponding <a data-link-type="dfn" href="#aaguid" id="ref-for-aaguid③">AAGUID</a>, which MAY be the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⑥">authenticator’s</a> AAGUID. (Since the <a data-link-type="dfn" href="#supplemental-public-key" id="ref-for-supplemental-public-key①">supplemental public key</a>'s scope is different from the <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential①⑥">user credential</a>, it will often have a different attestation. For example, the attestation for a <a data-link-type="dfn" href="#supplemental-public-key" id="ref-for-supplemental-public-key②">supplemental public key</a> with “device” scope can be tied to hardware roots of trust, although it does not have to be.)</p>
           <dt data-md>enterprise
           <dd data-md>
-           <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③④">Relying Party</a> wants to receive an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③⑨">attestation statement</a> that may include uniquely identifying information. This is intended for controlled deployments within an enterprise where the organization wishes to tie registrations to specific authenticators. <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⑦">Authenticators</a> MUST NOT provide such an attestation unless the user agent or authenticator configuration expressly permits it for the requested <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④⑧">RP ID</a>. If <i>not</i> permitted, then follow the steps for <code>direct</code> attestation. Otherwise <var>attFormat</var> is an <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format②⓪">attestation statement format</a> appropriate for this <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⑧">authenticator</a> based on <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionssupplementalpubkeysinputs-attestationformats" id="ref-for-dom-authenticationextensionssupplementalpubkeysinputs-attestationformats②">attestationFormats</a></code>, and <var>attAaguid</var> is the corresponding <a data-link-type="dfn" href="#aaguid" id="ref-for-aaguid④">AAGUID</a>, which MAY be the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⑨">authenticator’s</a> AAGUID.</p>
+           <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑥">Relying Party</a> wants to receive an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③⑨">attestation statement</a> that may include uniquely identifying information. This is intended for controlled deployments within an enterprise where the organization wishes to tie registrations to specific authenticators. <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⑦">Authenticators</a> MUST NOT provide such an attestation unless the user agent or authenticator configuration expressly permits it for the requested <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤①">RP ID</a>. If <i>not</i> permitted, then follow the steps for <code>direct</code> attestation. Otherwise <var>attFormat</var> is an <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format②⓪">attestation statement format</a> appropriate for this <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⑧">authenticator</a> based on <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionssupplementalpubkeysinputs-attestationformats" id="ref-for-dom-authenticationextensionssupplementalpubkeysinputs-attestationformats②">attestationFormats</a></code>, and <var>attAaguid</var> is the corresponding <a data-link-type="dfn" href="#aaguid" id="ref-for-aaguid④">AAGUID</a>, which MAY be the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⑨">authenticator’s</a> AAGUID.</p>
            <p class="note" role="note"><span class="marker">Note:</span> CTAP2 does not currently provide for an <a href="https://fidoalliance.org/specs/fido-v2.1-ps-20210615/fido-client-to-authenticator-protocol-v2.1-ps-errata-20220621.html#makecred-enterpriseattestation">enterpriseAttestation</a> signal during an <a href="https://fidoalliance.org/specs/fido-v2.1-ps-20210615/fido-client-to-authenticator-protocol-v2.1-ps-errata-20220621.html#authenticatorGetAssertion">authenticatorGetAssertion</a> call. Until that is changed, <a href="https://fidoalliance.org/specs/fido-v2.1-ps-20210615/fido-client-to-authenticator-protocol-v2.1-ps-errata-20220621.html#platform-managed-enterprise-attestation">platform-managed enterprise attestation</a> will not work in that context with CTAP2 <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⓪">authenticators</a>.</p>
          </dl>
         <li data-md>
@@ -7622,7 +7743,7 @@ <h5 class="heading settled" data-level="10.2.1.2" id="sctn-supplemental-public-k
          <p>Append <var>supplementalPubKey</var> to <var>spks</var>.</p>
         <li data-md>
          <p>Let <var>spkSig</var> be the result of signing the <a data-link-type="dfn" href="#assertion-signature" id="ref-for-assertion-signature①①">assertion signature</a> <a href="#fig-signature">input</a> with <var>supplementalPrivateKey</var>.</p>
-         <p class="note" role="note"><span class="marker">Note:</span> the <a data-link-type="dfn" href="#assertion-signature" id="ref-for-assertion-signature①②">assertion signature</a> <a href="#fig-signature">input</a>, and thus <var>spkSig</var>, covers the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑤">Relying Party</a>'s <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-challenge" id="ref-for-dom-publickeycredentialcreationoptions-challenge③">challenge</a></code> because it includes the <a data-link-type="dfn" href="#collectedclientdata-hash-of-the-serialized-client-data" id="ref-for-collectedclientdata-hash-of-the-serialized-client-data②①">hash of the serialized client data</a>. Thus the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑥">Relying Party</a> knows that <var>spkSig</var> is a fresh signature.</p>
+         <p class="note" role="note"><span class="marker">Note:</span> the <a data-link-type="dfn" href="#assertion-signature" id="ref-for-assertion-signature①②">assertion signature</a> <a href="#fig-signature">input</a>, and thus <var>spkSig</var>, covers the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑦">Relying Party</a>'s <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-challenge" id="ref-for-dom-publickeycredentialcreationoptions-challenge③">challenge</a></code> because it includes the <a data-link-type="dfn" href="#collectedclientdata-hash-of-the-serialized-client-data" id="ref-for-collectedclientdata-hash-of-the-serialized-client-data②①">hash of the serialized client data</a>. Thus the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑧">Relying Party</a> knows that <var>spkSig</var> is a fresh signature.</p>
         <li data-md>
          <p>Append <var>spkSig</var> to <var>spkSigs</var>.</p>
        </ol>
@@ -7634,9 +7755,9 @@ <h5 class="heading settled" data-level="10.2.1.2" id="sctn-supplemental-public-k
      </ol>
    </dl>
    <h6 class="heading settled" data-level="10.2.1.2.1" id="sctn-supplemental-public-keys-attestation-aaguid"><span class="secno">10.2.1.2.1. </span><span class="content">AAGUIDs</span><a class="self-link" href="#sctn-supplemental-public-keys-attestation-aaguid"></a></h6>
-   <p>Any non-zero <a data-link-type="dfn" href="#aaguid" id="ref-for-aaguid⑤">AAGUID</a>s included in the <code><a data-link-type="dfn" href="#supplementalpubkeys" id="ref-for-supplementalpubkeys⑥">supplementalPubKeys</a></code> extension output aid a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑦">Relying Party</a> in validating the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④②">attestation statement</a> of the supplemental public key. The interpretation of each AAGUID depends on the scope of the corresponding key. Some or all may differ from the <a data-link-type="dfn" href="#authdata-attestedcredentialdata-aaguid" id="ref-for-authdata-attestedcredentialdata-aaguid⑦">aaguid</a> in the <a data-link-type="dfn" href="#attested-credential-data" id="ref-for-attested-credential-data①④">attested credential data</a> of a <a data-link-type="dfn" href="#multi-device-credential" id="ref-for-multi-device-credential⑨">multi-device credential</a>. Thus the AAGUID of a <a data-link-type="dfn" href="#supplemental-public-key" id="ref-for-supplemental-public-key④">supplemental public key</a> MAY be different in a single response and either, or both, may be zero depending on the options requested and authenticator behaviour.</p>
+   <p>Any non-zero <a data-link-type="dfn" href="#aaguid" id="ref-for-aaguid⑤">AAGUID</a>s included in the <code><a data-link-type="dfn" href="#supplementalpubkeys" id="ref-for-supplementalpubkeys⑥">supplementalPubKeys</a></code> extension output aid a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑨">Relying Party</a> in validating the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④②">attestation statement</a> of the supplemental public key. The interpretation of each AAGUID depends on the scope of the corresponding key. Some or all may differ from the <a data-link-type="dfn" href="#authdata-attestedcredentialdata-aaguid" id="ref-for-authdata-attestedcredentialdata-aaguid⑦">aaguid</a> in the <a data-link-type="dfn" href="#attested-credential-data" id="ref-for-attested-credential-data①④">attested credential data</a> of a <a data-link-type="dfn" href="#multi-device-credential" id="ref-for-multi-device-credential⑨">multi-device credential</a>. Thus the AAGUID of a <a data-link-type="dfn" href="#supplemental-public-key" id="ref-for-supplemental-public-key④">supplemental public key</a> MAY be different in a single response and either, or both, may be zero depending on the options requested and authenticator behaviour.</p>
    <h6 class="heading settled" data-level="10.2.1.2.2" id="sctn-supplemental-public-keys-attestation-calculations"><span class="secno">10.2.1.2.2. </span><span class="content">Attestation calculations</span><a class="self-link" href="#sctn-supplemental-public-keys-attestation-calculations"></a></h6>
-   <p>When computing attestations, the process in <a href="#sctn-generating-an-attestation-object">§ 6.5.4 Generating an Attestation Object</a> takes two inputs: <code>authData</code> and <code>hash</code>. When calculating an attestation for a supplemental public key, the typical value for <code>authData</code> contains the attestation signature itself, which is impossible. Also the attestation of a supplemental public key is potentially used repeatedly, thus may want to be cached. But signing over values that include <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑧">Relying Party</a>-chosen nonces, like the <a data-link-type="dfn" href="#collectedclientdata-hash-of-the-serialized-client-data" id="ref-for-collectedclientdata-hash-of-the-serialized-client-data②②">hash of the serialized client data</a>, makes that impossible.</p>
+   <p>When computing attestations, the process in <a href="#sctn-generating-an-attestation-object">§ 6.5.4 Generating an Attestation Object</a> takes two inputs: <code>authData</code> and <code>hash</code>. When calculating an attestation for a supplemental public key, the typical value for <code>authData</code> contains the attestation signature itself, which is impossible. Also the attestation of a supplemental public key is potentially used repeatedly, thus may want to be cached. But signing over values that include <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⓪">Relying Party</a>-chosen nonces, like the <a data-link-type="dfn" href="#collectedclientdata-hash-of-the-serialized-client-data" id="ref-for-collectedclientdata-hash-of-the-serialized-client-data②②">hash of the serialized client data</a>, makes that impossible.</p>
    <p>Therefore when calculating an attestation for a supplemental public key, the inputs are:</p>
    <ul>
     <li data-md>
@@ -7647,12 +7768,12 @@ <h6 class="heading settled" data-level="10.2.1.2.2" id="sctn-supplemental-public
    <p>The attestation signature is thus typically calculated over the bytes of <code>(h’737570706c656d656e74616c5075624b657973206174746573746174696f6e2e00ffffffff' || <var>aaguid</var> || <var>spk</var> || <var>nonce</var>)</code>. The 37-byte prefix ensures domain separation: it takes the place of the RP ID hash, flags, and signature counter fields in those messages and ensures that no attestation signature for a supplemental public key can be confused with a signature for a <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential①⑧">user credential</a>.</p>
    <p>Note that when <var>nonce</var> is empty, then the (signed) authenticator extension output MAY be constant. However, the (unsigned) <var>spkSig</var> output is always unique and prevents replay of the (signed) extension output without knowledge of the supplemental private key.</p>
    <h5 class="heading settled" data-level="10.2.1.3" id="sctn-supplemental-public-keys-extension-verification"><span class="secno">10.2.1.3. </span><span class="content"><code>supplementalPubKeys</code> Extension Output Verification Procedures</span><a class="self-link" href="#sctn-supplemental-public-keys-extension-verification"></a></h5>
-   <p>Verifying the <code><a data-link-type="dfn" href="#supplementalpubkeys" id="ref-for-supplementalpubkeys⑦">supplementalPubKeys</a></code> extension output is performed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑨">Relying Party</a> whenever a supplemental public key is returned within the extension output.</p>
+   <p>Verifying the <code><a data-link-type="dfn" href="#supplementalpubkeys" id="ref-for-supplementalpubkeys⑦">supplementalPubKeys</a></code> extension output is performed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④①">Relying Party</a> whenever a supplemental public key is returned within the extension output.</p>
    <p>The <a data-link-type="dfn" href="#supplementalpubkeys" id="ref-for-supplementalpubkeys⑧">supplementalPubKeys</a> extension adds the following <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#struct-item" id="ref-for-struct-item①③">item</a> to <a data-link-type="dfn" href="#credential-record" id="ref-for-credential-record②②">credential records</a>:</p>
    <dl>
     <dt data-md><dfn class="dfn-paneled" data-dfn-for="credential record" data-dfn-type="abstract-op" data-export id="abstract-opdef-credential-record-supplementalpubkeys">supplementalPubKeys</dfn>
     <dd data-md>
-     <p>An initially <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty⑥">empty</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set⑧">set</a> of <a data-link-type="dfn" href="#credential-record-supplemental-public-key-record" id="ref-for-credential-record-supplemental-public-key-record">supplemental public key records</a> associated with this <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑥⑨">public key credential source</a>.</p>
+     <p>An initially <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty⑥">empty</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set⑨">set</a> of <a data-link-type="dfn" href="#credential-record-supplemental-public-key-record" id="ref-for-credential-record-supplemental-public-key-record">supplemental public key records</a> associated with this <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source⑥⑨">public key credential source</a>.</p>
      <p>A <dfn class="dfn-paneled" data-dfn-for="credential record" data-dfn-type="dfn" data-noexport id="credential-record-supplemental-public-key-record">supplemental public key record</dfn> is an abstract representation of a registered supplemental public key.
 It is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#struct" id="ref-for-struct⑥">struct</a> with the following <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#struct-item" id="ref-for-struct-item①④">items</a>:</p>
      <dl>
@@ -7675,17 +7796,17 @@ <h5 class="heading settled" data-level="10.2.1.3" id="sctn-supplemental-public-k
      </dl>
    </dl>
    <h6 class="heading settled" data-level="10.2.1.3.1" id="sctn-supplemental-public-keys-extension-verification-create"><span class="secno">10.2.1.3.1. </span><span class="content">Registration (<code>create()</code>)</span><a class="self-link" href="#sctn-supplemental-public-keys-extension-verification-create"></a></h6>
-   <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⓪">Relying Party</a> requested the <code>supplementalPubKeys</code> extension in a <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③⑨">navigator.credentials.create()</a></code> call,
-then the below verification steps are performed in the context of <a href="#reg-ceremony-verify-extension-outputs">step 20</a> of <a href="#sctn-registering-a-new-credential">§ 7.1 Registering a New Credential</a> using these variables established therein: <var>credential</var>, <var>clientExtensionResults</var>, <var>authData</var>, and <var>hash</var>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④①">Relying Party</a> policy may specify whether a response without a <code>supplementalPubKeys</code> extension output is acceptable.</p>
+   <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④②">Relying Party</a> requested the <code>supplementalPubKeys</code> extension in a <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③⑨">navigator.credentials.create()</a></code> call,
+then the below verification steps are performed in the context of <a href="#reg-ceremony-verify-extension-outputs">step 20</a> of <a href="#sctn-registering-a-new-credential">§ 7.1 Registering a New Credential</a> using these variables established therein: <var>credential</var>, <var>clientExtensionResults</var>, <var>authData</var>, and <var>hash</var>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④③">Relying Party</a> policy may specify whether a response without a <code>supplementalPubKeys</code> extension output is acceptable.</p>
    <ol>
     <li data-md>
      <p>Verify that the <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsclientoutputs-supplementalpubkeys" id="ref-for-dom-authenticationextensionsclientoutputs-supplementalpubkeys">supplementalPubKeys</a></code> member of <var>clientExtensionResults</var> exists, and contains the <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionssupplementalpubkeysoutputs-signatures" id="ref-for-dom-authenticationextensionssupplementalpubkeysoutputs-signatures">signatures</a></code> field. Let <var>signatures</var> be the value of that field.</p>
     <li data-md>
      <p>Let <var>attObjsForSupplementalPublicKey</var> be the value of the <code>supplementalPubKeys</code> member of the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output①⑧">authenticator extension output</a> from <var>authData</var>.</p>
     <li data-md>
-     <p>If the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size①">size</a> of <var>attObjsForSupplementalPublicKey</var> is not equal to the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size②">size</a> of <var>signatures</var> then abort the registration process with an error.</p>
+     <p>If the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size③">size</a> of <var>attObjsForSupplementalPublicKey</var> is not equal to the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size④">size</a> of <var>signatures</var> then abort the registration process with an error.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate②①">Iterate</a> over the indices of <var>attObjsForSupplementalPublicKey</var> (which, after the check in the previous step, must also be the indices of <var>signatures</var>). Then, for each (<var>attObjForSupplementalPubKey</var>, <var>signature</var>) from the two lists:</p>
+     <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate②②">Iterate</a> over the indices of <var>attObjsForSupplementalPublicKey</var> (which, after the check in the previous step, must also be the indices of <var>signatures</var>). Then, for each (<var>attObjForSupplementalPubKey</var>, <var>signature</var>) from the two lists:</p>
      <ol>
       <li data-md>
        <p>Extract the contained fields from <var>attObjForSupplementalPubKey</var>: <var>aaguid</var>, <var>spk</var>, <var>nonce</var>, <var>fmt</var> and <var>attStmt</var>. Also let <var>scope</var> reflect the scope, specified by the member of the <code>scope</code> group that is present.</p>
@@ -7693,7 +7814,7 @@ <h6 class="heading settled" data-level="10.2.1.3.1" id="sctn-supplemental-public
       <li data-md>
        <p>Verify that <var>signature</var> is a valid signature over the <a data-link-type="dfn" href="#assertion-signature" id="ref-for-assertion-signature①③">assertion signature</a> <a href="#fig-signature">input</a> (i.e. <code>authData</code> and <code>hash</code>) by the <a data-link-type="dfn" href="#supplemental-public-key" id="ref-for-supplemental-public-key⑤">supplemental public key</a> <var>spk</var>. (The signature algorithm is the same as for the <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential①⑨">user credential</a>.)</p>
       <li data-md>
-       <p>Optionally, if attestation was requested and the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④②">Relying Party</a> wishes to verify it, verify that <var>attStmt</var> is a correct <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④⑤">attestation statement</a>, conveying a valid <a data-link-type="dfn" href="#attestation-signature" id="ref-for-attestation-signature①⑦">attestation signature</a>, by using the <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format②③">attestation statement format</a> <var>fmt</var>’s <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure①⑤">verification procedure</a> given <var>attStmt</var>. See <a href="#sctn-supplemental-public-keys-attestation-calculations">§ 10.2.1.2.2 Attestation calculations</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④③">Relying Party</a> policy may specifiy which attestations are acceptable.</p>
+       <p>Optionally, if attestation was requested and the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④④">Relying Party</a> wishes to verify it, verify that <var>attStmt</var> is a correct <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④⑤">attestation statement</a>, conveying a valid <a data-link-type="dfn" href="#attestation-signature" id="ref-for-attestation-signature①⑦">attestation signature</a>, by using the <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format②③">attestation statement format</a> <var>fmt</var>’s <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure①⑤">verification procedure</a> given <var>attStmt</var>. See <a href="#sctn-supplemental-public-keys-attestation-calculations">§ 10.2.1.2.2 Attestation calculations</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑤">Relying Party</a> policy may specifiy which attestations are acceptable.</p>
        <p class="note" role="note"><span class="marker">Note:</span> If <var>fmt</var>’s value is "<a data-link-type="dfn" href="#none" id="ref-for-none⑧">none</a>" there is no attestation signature to verify.</p>
       <li data-md>
        <p>Create a new <a data-link-type="dfn" href="#credential-record-supplemental-public-key-record" id="ref-for-credential-record-supplemental-public-key-record①">supplemental public key record</a> with the contents:</p>
@@ -7720,19 +7841,19 @@ <h6 class="heading settled" data-level="10.2.1.3.1" id="sctn-supplemental-public
    </ol>
    <p>See also <a href="#sctn-supplemental-public-keys-extension-usage">§ 10.2.1.1 Relying Party Usage</a> for further details.</p>
    <h6 class="heading settled" data-level="10.2.1.3.2" id="sctn-supplemental-public-keys-extension-verification-get"><span class="secno">10.2.1.3.2. </span><span class="content">Authentication (<code>get()</code>)</span><a class="self-link" href="#sctn-supplemental-public-keys-extension-verification-get"></a></h6>
-   <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④④">Relying Party</a> requested the <code>supplementalPubKeys</code> extension in a <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get④④">navigator.credentials.get()</a></code> call,
-then the below verification steps are performed in the context of <a href="#authn-ceremony-verify-extension-outputs">step 19</a> of <a href="#sctn-verifying-assertion">§ 7.2 Verifying an Authentication Assertion</a> using these variables established therein: <var>credential</var>, <var>clientExtensionResults</var>, <var>authData</var>, <var>hash</var>, and <var>credentialRecord</var>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑤">Relying Party</a> policy may specify whether a response without a <code>supplementalPubKeys</code> extension output is acceptable.</p>
+   <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑥">Relying Party</a> requested the <code>supplementalPubKeys</code> extension in a <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get④④">navigator.credentials.get()</a></code> call,
+then the below verification steps are performed in the context of <a href="#authn-ceremony-verify-extension-outputs">step 19</a> of <a href="#sctn-verifying-assertion">§ 7.2 Verifying an Authentication Assertion</a> using these variables established therein: <var>credential</var>, <var>clientExtensionResults</var>, <var>authData</var>, <var>hash</var>, and <var>credentialRecord</var>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑦">Relying Party</a> policy may specify whether a response without a <code>supplementalPubKeys</code> extension output is acceptable.</p>
    <ol>
     <li data-md>
-     <p>Let <var>recognizedSpks</var> be a new <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty⑦">empty</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set⑨">set</a>.</p>
+     <p>Let <var>recognizedSpks</var> be a new <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty⑦">empty</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set①⓪">set</a>.</p>
     <li data-md>
      <p>Verify that the <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsclientoutputs-supplementalpubkeys" id="ref-for-dom-authenticationextensionsclientoutputs-supplementalpubkeys①">supplementalPubKeys</a></code> member of <var>clientExtensionResults</var> exists, and contains the <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionssupplementalpubkeysoutputs-signatures" id="ref-for-dom-authenticationextensionssupplementalpubkeysoutputs-signatures①">signatures</a></code> field. Let <var>signatures</var> be the value of that field.</p>
     <li data-md>
      <p>Let <var>attObjsForSupplementalPubKeys</var> be the value of the <code>supplementalPubKeys</code> member of the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output①⑨">authenticator extension output</a> from <var>authData</var>.</p>
     <li data-md>
-     <p>If the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size③">size</a> of <var>attObjsForSupplementalPubKeys</var> is not equal to the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size④">size</a> of <var>signatures</var> then abort the authentication process with an error.</p>
+     <p>If the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size⑤">size</a> of <var>attObjsForSupplementalPubKeys</var> is not equal to the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size⑥">size</a> of <var>signatures</var> then abort the authentication process with an error.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate②②">Iterate</a> over the indices of <var>attObjsForSupplementalPubKeys</var> (which, after the check in the previous step, must also be the indices of <var>signatures</var>). Then, for each (<var>attObjForSupplementalPubKey</var>, <var>signature</var>) from the two lists:</p>
+     <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate②③">Iterate</a> over the indices of <var>attObjsForSupplementalPubKeys</var> (which, after the check in the previous step, must also be the indices of <var>signatures</var>). Then, for each (<var>attObjForSupplementalPubKey</var>, <var>signature</var>) from the two lists:</p>
      <ol>
       <li data-md>
        <p>Extract the contained fields from <var>attObjForSupplementalPubKey</var>: <var>aaguid</var>, <var>spk</var>, <var>nonce</var>, <var>fmt</var>, <var>attStmt</var>. Also let <var>scope</var> reflect the scope, specified by the member of the <code>scope</code> group that is present.</p>
@@ -7740,23 +7861,23 @@ <h6 class="heading settled" data-level="10.2.1.3.2" id="sctn-supplemental-public
       <li data-md>
        <p>Verify that <var>signature</var> is a valid signature over the <a data-link-type="dfn" href="#assertion-signature" id="ref-for-assertion-signature①④">assertion signature</a> <a href="#fig-signature">input</a> (i.e. <code>authData</code> and <code>hash</code>) by the <a data-link-type="dfn" href="#supplemental-public-key" id="ref-for-supplemental-public-key⑥">supplemental public key</a> <var>spk</var>. (The signature algorithm is the same as for the <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential②⓪">user credential</a>.)</p>
       <li data-md>
-       <p>Let <var>matchedSpkRecords</var> be a new <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty⑧">empty</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set①⓪">set</a>. <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate②③">For each</a> <var>spkRecord</var> in <var>credentialRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-credential-record-supplementalpubkeys" id="ref-for-abstract-opdef-credential-record-supplementalpubkeys①">supplementalPubKeys</a>:</p>
+       <p>Let <var>matchedSpkRecords</var> be a new <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty⑧">empty</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set①①">set</a>. <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate②④">For each</a> <var>spkRecord</var> in <var>credentialRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-credential-record-supplementalpubkeys" id="ref-for-abstract-opdef-credential-record-supplementalpubkeys①">supplementalPubKeys</a>:</p>
        <ol>
         <li data-md>
          <p>If <var>spkRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-supplementalpubkeys-record-aaguid" id="ref-for-abstract-opdef-supplementalpubkeys-record-aaguid①">aaguid</a> equals <var>aaguid</var>, <var>spkRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-supplementalpubkeys-record-spk" id="ref-for-abstract-opdef-supplementalpubkeys-record-spk①">spk</a> equals <var>spk</var>,
   and <var>spkRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-supplementalpubkeys-record-scope" id="ref-for-abstract-opdef-supplementalpubkeys-record-scope①">scope</a> equals <var>scope</var>:</p>
          <ol>
           <li data-md>
-           <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append⑥">Append</a> <var>spkRecord</var> to <var>matchedSpkRecords</var>.</p>
+           <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append⑦">Append</a> <var>spkRecord</var> to <var>matchedSpkRecords</var>.</p>
          </ol>
        </ol>
       <li data-md>
        <p>If <var>matchedSpkRecords</var></p>
        <dl class="switch">
-        <dt data-md>has <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size⑤">size</a> greater than one:
+        <dt data-md>has <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size⑦">size</a> greater than one:
         <dd data-md>
          <p>Some form of error has occurred: <var>credentialRecord</var> invariants have been broken. Terminate these verification steps.</p>
-        <dt data-md>has <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size⑥">size</a> equal to one:
+        <dt data-md>has <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size⑧">size</a> equal to one:
         <dd data-md>
          <p>This is a known <a data-link-type="dfn" href="#supplemental-public-key" id="ref-for-supplemental-public-key⑦">supplemental public key</a></p>
          <p>If <var>fmt</var>’s value is "none" then there is no attestation signature to verify and this is a known <a data-link-type="dfn" href="#supplemental-public-key" id="ref-for-supplemental-public-key⑧">supplemental public key</a> with a valid signature. Append <var>spkRecord</var> to <var>recognizedSpks</var> and continue to the next iteration, if any.</p>
@@ -7768,7 +7889,7 @@ <h6 class="heading settled" data-level="10.2.1.3.2" id="sctn-supplemental-public
            <p class="note" role="note"><span class="marker">Note:</span> This authenticator is not generating a fresh per-response random nonce.</p>
           <dt data-md>does not equal <var>spkRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-supplementalpubkeys-record-attstmt" id="ref-for-abstract-opdef-supplementalpubkeys-record-attstmt②">attStmt</a> by binary equality:
           <dd data-md>
-           <p>Optionally, if attestation was requested and the RP wishes to verify it, verify that <var>attStmt</var> is a correct <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④⑥">attestation statement</a>, conveying a valid <a data-link-type="dfn" href="#attestation-signature" id="ref-for-attestation-signature①⑧">attestation signature</a>, by using the <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format②④">attestation statement format</a> <var>fmt</var>’s <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure①⑥">verification procedure</a> given <var>attStmt</var>. See <a href="#sctn-supplemental-public-keys-attestation-calculations">§ 10.2.1.2.2 Attestation calculations</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑥">Relying Party</a> policy may specifiy which attestations are acceptable.</p>
+           <p>Optionally, if attestation was requested and the RP wishes to verify it, verify that <var>attStmt</var> is a correct <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④⑥">attestation statement</a>, conveying a valid <a data-link-type="dfn" href="#attestation-signature" id="ref-for-attestation-signature①⑧">attestation signature</a>, by using the <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format②④">attestation statement format</a> <var>fmt</var>’s <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure①⑥">verification procedure</a> given <var>attStmt</var>. See <a href="#sctn-supplemental-public-keys-attestation-calculations">§ 10.2.1.2.2 Attestation calculations</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑧">Relying Party</a> policy may specifiy which attestations are acceptable.</p>
            <p>If the result is:</p>
            <dl class="switch">
             <dt data-md>successful
@@ -7784,13 +7905,13 @@ <h6 class="heading settled" data-level="10.2.1.3.2" id="sctn-supplemental-public
          <p>This is possibly a new <a data-link-type="dfn" href="#supplemental-public-key" id="ref-for-supplemental-public-key①②">supplemental public key</a>.</p>
          <ol>
           <li data-md>
-           <p>Let <var>matchedSpkKeys</var> be a new <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty①⓪">empty</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set①①">set</a>. <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate②④">For each</a> <var>spkRecord</var> in <var>credentialRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-credential-record-supplementalpubkeys" id="ref-for-abstract-opdef-credential-record-supplementalpubkeys②">supplementalPubKeys</a>:</p>
+           <p>Let <var>matchedSpkKeys</var> be a new <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty①⓪">empty</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set①②">set</a>. <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate②⑤">For each</a> <var>spkRecord</var> in <var>credentialRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-credential-record-supplementalpubkeys" id="ref-for-abstract-opdef-credential-record-supplementalpubkeys②">supplementalPubKeys</a>:</p>
            <ol>
             <li data-md>
              <p>If <var>spkRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-supplementalpubkeys-record-spk" id="ref-for-abstract-opdef-supplementalpubkeys-record-spk②">spk</a> equals <var>spk</var>:</p>
              <ol>
               <li data-md>
-               <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append⑦">Append</a> <var>spkRecord</var> to <var>matchedSpkKeys</var>.</p>
+               <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append⑧">Append</a> <var>spkRecord</var> to <var>matchedSpkKeys</var>.</p>
              </ol>
            </ol>
           <li data-md>
@@ -7798,10 +7919,10 @@ <h6 class="heading settled" data-level="10.2.1.3.2" id="sctn-supplemental-public
            <dl class="switch">
             <dt data-md>If <var>fmt</var>’s value is "none":
             <dd data-md>
-             <p>There is no attestation signature to verify and this is a new supplemental key. Unless <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑦">Relying Party</a> policy specifies that this attestation is unacceptable, <a data-link-type="abstract-op" href="#abstract-opdef-create-a-new-supplemental-public-key-record" id="ref-for-abstract-opdef-create-a-new-supplemental-public-key-record">Create a new supplemental public key record</a> and then continue to the next iteration, if any.</p>
+             <p>There is no attestation signature to verify and this is a new supplemental key. Unless <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑨">Relying Party</a> policy specifies that this attestation is unacceptable, <a data-link-type="abstract-op" href="#abstract-opdef-create-a-new-supplemental-public-key-record" id="ref-for-abstract-opdef-create-a-new-supplemental-public-key-record">Create a new supplemental public key record</a> and then continue to the next iteration, if any.</p>
             <dt data-md>Otherwise:
             <dd data-md>
-             <p>Optionally, if attestation was requested and the RP wishes to verify it, verify that <var>attStmt</var> is a correct <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④⑦">attestation statement</a>, conveying a valid <a data-link-type="dfn" href="#attestation-signature" id="ref-for-attestation-signature①⑨">attestation signature</a>, by using the <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format②⑤">attestation statement format</a> <var>fmt</var>’s <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure①⑦">verification procedure</a> given <var>attStmt</var>. See <a href="#sctn-supplemental-public-keys-attestation-calculations">§ 10.2.1.2.2 Attestation calculations</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑧">Relying Party</a> policy may specifiy which attestations are acceptable.</p>
+             <p>Optionally, if attestation was requested and the RP wishes to verify it, verify that <var>attStmt</var> is a correct <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④⑦">attestation statement</a>, conveying a valid <a data-link-type="dfn" href="#attestation-signature" id="ref-for-attestation-signature①⑨">attestation signature</a>, by using the <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format②⑤">attestation statement format</a> <var>fmt</var>’s <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure①⑦">verification procedure</a> given <var>attStmt</var>. See <a href="#sctn-supplemental-public-keys-attestation-calculations">§ 10.2.1.2.2 Attestation calculations</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⓪">Relying Party</a> policy may specifiy which attestations are acceptable.</p>
              <p>If the result is:</p>
              <dl class="switch">
               <dt data-md>successful
@@ -7813,12 +7934,12 @@ <h6 class="heading settled" data-level="10.2.1.3.2" id="sctn-supplemental-public
              </dl>
            </dl>
           <li data-md>
-           <p>Otherwise there is some form of error: we recieved a known <var>spk</var> value, but one or more of the accompanying <var>aaguid</var> or <var>scope</var> values did not match what the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑨">Relying Party</a> has stored along with that <var>spk</var> value. Terminate these verification steps.</p>
+           <p>Otherwise there is some form of error: we recieved a known <var>spk</var> value, but one or more of the accompanying <var>aaguid</var> or <var>scope</var> values did not match what the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤①">Relying Party</a> has stored along with that <var>spk</var> value. Terminate these verification steps.</p>
          </ol>
        </dl>
      </ol>
    </ol>
-   <p>At the end of these steps, <var>recognizedSpks</var> contains zero or more <a data-link-type="dfn" href="#supplemental-public-key" id="ref-for-supplemental-public-key①④">supplemental public keys</a> that were previously known for this <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential②①">user credential</a>. These keys make claims about the continuity of certain factors between this authentication attempt and previous ones. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⓪">Relying Party</a> should judge those claims in light of the attestations provided, if any, and evaluate the risk of this authentication in light of this information.</p>
+   <p>At the end of these steps, <var>recognizedSpks</var> contains zero or more <a data-link-type="dfn" href="#supplemental-public-key" id="ref-for-supplemental-public-key①④">supplemental public keys</a> that were previously known for this <a data-link-type="dfn" href="#user-credential" id="ref-for-user-credential②①">user credential</a>. These keys make claims about the continuity of certain factors between this authentication attempt and previous ones. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤②">Relying Party</a> should judge those claims in light of the attestations provided, if any, and evaluate the risk of this authentication in light of this information.</p>
    <p>See also <a href="#sctn-supplemental-public-keys-extension-usage">§ 10.2.1.1 Relying Party Usage</a>.</p>
    <p>To <dfn class="dfn-paneled" data-dfn-type="abstract-op" data-export id="abstract-opdef-create-a-new-supplemental-public-key-record">Create a new supplemental public key record</dfn>, perform the following steps:</p>
    <ol>
@@ -7841,7 +7962,7 @@ <h6 class="heading settled" data-level="10.2.1.3.2" id="sctn-supplemental-public
       <dd data-md>
        <p>The value of <var>attStmt</var>.</p>
      </dl>
-     <p>In <a href="#authn-ceremony-update-credential-record">step 23</a> of <a href="#sctn-verifying-assertion">§ 7.2 Verifying an Authentication Assertion</a>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append⑧">append</a> this <a data-link-type="dfn" href="#credential-record-supplemental-public-key-record" id="ref-for-credential-record-supplemental-public-key-record④">supplemental public key record</a> to <var>credentialRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-credential-record-supplementalpubkeys" id="ref-for-abstract-opdef-credential-record-supplementalpubkeys③">supplementalPubKeys</a>.</p>
+     <p>In <a href="#authn-ceremony-update-credential-record">step 23</a> of <a href="#sctn-verifying-assertion">§ 7.2 Verifying an Authentication Assertion</a>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append⑨">append</a> this <a data-link-type="dfn" href="#credential-record-supplemental-public-key-record" id="ref-for-credential-record-supplemental-public-key-record④">supplemental public key record</a> to <var>credentialRecord</var>.<a data-link-type="abstract-op" href="#abstract-opdef-credential-record-supplementalpubkeys" id="ref-for-abstract-opdef-credential-record-supplementalpubkeys③">supplementalPubKeys</a>.</p>
    </ol>
    <h2 class="heading settled" data-level="11" id="sctn-automation"><span class="secno">11. </span><span class="content">User Agent Automation</span><a class="self-link" href="#sctn-automation"></a></h2>
    <p>For the purposes of user agent automation and <a data-link-type="dfn" href="#web-application" id="ref-for-web-application④">web application</a> testing, this document defines a number of <a data-link-type="biblio" href="#biblio-webdriver" title="WebDriver">[WebDriver]</a> <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-extension-commands" id="ref-for-dfn-extension-commands">extension commands</a>.</p>
@@ -8191,7 +8312,7 @@ <h3 class="heading settled" data-level="11.5" id="sctn-automation-add-credential
     <li data-md>
      <p>Let <var>rpId</var> be the <var>parameters</var>’ <var>rpId</var> property.</p>
     <li data-md>
-     <p>If <var>rpId</var> is not a valid <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④⑨">RP ID</a>, return a <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error" id="ref-for-dfn-error①①">WebDriver error</a> with <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error-code" id="ref-for-dfn-error-code①①">WebDriver error code</a> <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-invalid-argument" id="ref-for-dfn-invalid-argument①⓪">invalid argument</a>.</p>
+     <p>If <var>rpId</var> is not a valid <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤②">RP ID</a>, return a <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error" id="ref-for-dfn-error①①">WebDriver error</a> with <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error-code" id="ref-for-dfn-error-code①①">WebDriver error code</a> <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-invalid-argument" id="ref-for-dfn-invalid-argument①⓪">invalid argument</a>.</p>
     <li data-md>
      <p>Let <var>privateKey</var> be the result of decoding <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding②④">Base64url Encoding</a> on the <var>parameters</var>’ <var>privateKey</var> property.</p>
     <li data-md>
@@ -8499,7 +8620,7 @@ <h3 class="heading settled" data-level="12.2" id="sctn-att-fmt-reg"><span class=
     <li data-md>
      <p>WebAuthn Attestation Statement Format Identifier: none</p>
     <li data-md>
-     <p>Description: Used to replace any authenticator-provided attestation statement when a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④①">WebAuthn Relying Party</a> indicates it does not wish to receive attestation information.</p>
+     <p>Description: Used to replace any authenticator-provided attestation statement when a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④②">WebAuthn Relying Party</a> indicates it does not wish to receive attestation information.</p>
     <li data-md>
      <p>Specification Document: Section <a href="#sctn-none-attestation">§ 8.7 None Attestation Statement Format</a> of this specification</p>
    </ul>
@@ -8509,7 +8630,7 @@ <h3 class="heading settled" data-level="12.3" id="sctn-extensions-reg-update"><s
     <li data-md>
      <p>WebAuthn Extension Identifier: appid</p>
     <li data-md>
-     <p>Description: This <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension②②">authentication extension</a> allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④②">WebAuthn Relying Parties</a> that have previously registered a credential using the legacy
+     <p>Description: This <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension②②">authentication extension</a> allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④③">WebAuthn Relying Parties</a> that have previously registered a credential using the legacy
 FIDO JavaScript APIs to request an assertion.</p>
     <li data-md>
      <p>Specification Document: Section <a href="#sctn-appid-extension">§ 10.1.1 FIDO AppID Extension (appid)</a> of this specification <br><br></p>
@@ -8520,60 +8641,60 @@ <h3 class="heading settled" data-level="12.4" id="sctn-extensions-reg"><span cla
     <li data-md>
      <p>WebAuthn Extension Identifier: appidExclude</p>
     <li data-md>
-     <p>Description: This registration extension allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④③">WebAuthn Relying Parties</a> to exclude authenticators that contain specified credentials that were created with the legacy FIDO U2F JavaScript API <a data-link-type="biblio" href="#biblio-fidou2fjavascriptapi" title="FIDO U2F JavaScript API">[FIDOU2FJavaScriptAPI]</a>.</p>
+     <p>Description: This registration extension allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④④">WebAuthn Relying Parties</a> to exclude authenticators that contain specified credentials that were created with the legacy FIDO U2F JavaScript API <a data-link-type="biblio" href="#biblio-fidou2fjavascriptapi" title="FIDO U2F JavaScript API">[FIDOU2FJavaScriptAPI]</a>.</p>
     <li data-md>
      <p>Specification Document: Section <a href="#sctn-appid-exclude-extension">§ 10.1.2 FIDO AppID Exclusion Extension (appidExclude)</a> of this specification <br><br></p>
     <li data-md>
      <p>WebAuthn Extension Identifier: credProps</p>
     <li data-md>
      <p>Description: This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension①③">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension②③">registration extension</a> enables reporting of a newly-created <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential②①">credential</a>'s properties,
-as determined by the <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑧">client</a>, to the calling <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④④">WebAuthn Relying Party</a>'s <a data-link-type="dfn" href="#web-application" id="ref-for-web-application⑤">web application</a>.</p>
+as determined by the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⓪">client</a>, to the calling <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑤">WebAuthn Relying Party</a>'s <a data-link-type="dfn" href="#web-application" id="ref-for-web-application⑤">web application</a>.</p>
     <li data-md>
      <p>Specification Document: Section <a href="#sctn-authenticator-credential-properties-extension">§ 10.1.3 Credential Properties Extension (credProps)</a> of this specification <br><br></p>
     <li data-md>
      <p>WebAuthn Extension Identifier: largeBlob</p>
     <li data-md>
-     <p>Description: This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension①④">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension②④">registration extension</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension②③">authentication extension</a> allows a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤①">Relying Party</a> to store opaque data associated with a credential.</p>
+     <p>Description: This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension①④">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension②④">registration extension</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension②③">authentication extension</a> allows a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤③">Relying Party</a> to store opaque data associated with a credential.</p>
     <li data-md>
      <p>Specification Document: Section <a href="#sctn-large-blob-extension">§ 10.1.5 Large blob storage extension (largeBlob)</a> of this specification</p>
    </ul>
    <h2 class="heading settled" data-level="13" id="sctn-security-considerations"><span class="secno">13. </span><span class="content">Security Considerations</span><a class="self-link" href="#sctn-security-considerations"></a></h2>
    <p>This specification defines a <a href="#sctn-api">Web API</a> and a cryptographic peer-entity authentication protocol.
 The <a data-link-type="dfn" href="#web-authentication-api" id="ref-for-web-authentication-api①⑦">Web Authentication API</a> allows Web developers (i.e., "authors") to utilize the Web Authentication protocol in their <a data-link-type="dfn" href="#registration" id="ref-for-registration②②">registration</a> and <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①⑤">authentication</a> <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①③">ceremonies</a>.
-The entities comprising the Web Authentication protocol endpoints are user-controlled <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①⓪">WebAuthn Authenticators</a> and a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑤">WebAuthn Relying Party</a>'s
-computing environment hosting the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤②">Relying Party</a>'s <a data-link-type="dfn" href="#web-application" id="ref-for-web-application⑥">web application</a>.
-In this model, the user agent, together with the <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client①④">WebAuthn Client</a>, comprise an intermediary between <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥②">authenticators</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤③">Relying Parties</a>.
-Additionally, <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥③">authenticators</a> can <a data-link-type="dfn" href="#attestation" id="ref-for-attestation②⑧">attest</a> to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤④">Relying Parties</a> as to their provenance.</p>
+The entities comprising the Web Authentication protocol endpoints are user-controlled <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①⓪">WebAuthn Authenticators</a> and a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑥">WebAuthn Relying Party</a>'s
+computing environment hosting the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤④">Relying Party</a>'s <a data-link-type="dfn" href="#web-application" id="ref-for-web-application⑥">web application</a>.
+In this model, the user agent, together with the <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client①⑧">WebAuthn Client</a>, comprise an intermediary between <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥②">authenticators</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑤">Relying Parties</a>.
+Additionally, <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥③">authenticators</a> can <a data-link-type="dfn" href="#attestation" id="ref-for-attestation②⑧">attest</a> to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑥">Relying Parties</a> as to their provenance.</p>
    <p>At this time, this specification does not feature detailed security considerations. However, the <a data-link-type="biblio" href="#biblio-fidosecref" title="FIDO Security Reference">[FIDOSecRef]</a> document provides a security analysis which is overall applicable to this specification.
 Also, the <a data-link-type="biblio" href="#biblio-fidoauthnrsecreqs" title="FIDO Authenticator Security Requirements">[FIDOAuthnrSecReqs]</a> document suite provides useful information about <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥④">authenticator</a> security characteristics.</p>
    <p>The below subsections comprise the current Web Authentication-specific security considerations.
 They are divided by audience;
 general security considerations are direct subsections of this section,
-while security considerations specifically for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⑤">authenticator</a>, <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑨">client</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑤">Relying Party</a> implementers
+while security considerations specifically for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⑤">authenticator</a>, <a data-link-type="dfn" href="#client" id="ref-for-client①⓪①">client</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑦">Relying Party</a> implementers
 are grouped into respective subsections.</p>
    <h3 class="heading settled" data-level="13.1" id="sctn-credentialIdSecurity"><span class="secno">13.1. </span><span class="content">Credential ID Unsigned</span><a class="self-link" href="#sctn-credentialIdSecurity"></a></h3>
    <p>The <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④②">credential ID</a> accompanying an <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①④">authentication assertion</a> is not signed.
 This is not a problem because all that would happen if an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⑥">authenticator</a> returns
-the wrong <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④③">credential ID</a>, or if an attacker intercepts and manipulates the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④④">credential ID</a>, is that the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑥">WebAuthn Relying Party</a> would not look up the correct <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑤">credential public key</a> with which to verify the returned signed <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data⑤⑨">authenticator data</a> (a.k.a., <a data-link-type="dfn" href="#assertion" id="ref-for-assertion①①">assertion</a>), and thus the interaction would end in an error.</p>
+the wrong <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④③">credential ID</a>, or if an attacker intercepts and manipulates the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④④">credential ID</a>, is that the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑦">WebAuthn Relying Party</a> would not look up the correct <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑤">credential public key</a> with which to verify the returned signed <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data⑤⑨">authenticator data</a> (a.k.a., <a data-link-type="dfn" href="#assertion" id="ref-for-assertion①①">assertion</a>), and thus the interaction would end in an error.</p>
    <h3 class="heading settled" data-level="13.2" id="sctn-client-authenticator-proximity"><span class="secno">13.2. </span><span class="content">Physical Proximity between Client and Authenticator</span><a class="self-link" href="#sctn-client-authenticator-proximity"></a></h3>
-   <p>In the WebAuthn <a data-link-type="dfn" href="#authenticator-model" id="ref-for-authenticator-model④">authenticator model</a>, it is generally assumed that <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators②④">roaming authenticators</a> are physically close to, and communicate directly with, the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⓪">client</a>.
+   <p>In the WebAuthn <a data-link-type="dfn" href="#authenticator-model" id="ref-for-authenticator-model④">authenticator model</a>, it is generally assumed that <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators②④">roaming authenticators</a> are physically close to, and communicate directly with, the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪②">client</a>.
 This arrangement has some important advantages.</p>
-   <p>The promise of physical proximity between <a data-link-type="dfn" href="#client" id="ref-for-client①⓪①">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⑦">authenticator</a> is a key strength of a <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②⑤">something you have</a> <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②⑥">authentication factor</a>.
+   <p>The promise of physical proximity between <a data-link-type="dfn" href="#client" id="ref-for-client①⓪③">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⑦">authenticator</a> is a key strength of a <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②⑤">something you have</a> <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②⑥">authentication factor</a>.
 For example, if a <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators②⑤">roaming authenticator</a> can communicate only via USB or Bluetooth,
 the limited range of these transports ensures that any malicious actor
 must physically be within that range in order to interact with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⑧">authenticator</a>.
 This is not necessarily true of an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⑨">authenticator</a> that can be invoked remotely —
 even if the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦⓪">authenticator</a> verifies <a data-link-type="dfn" href="#concept-user-present" id="ref-for-concept-user-present④">user presence</a>,
 users can be tricked into authorizing remotely initiated malicious requests.</p>
-   <p>Direct communication between <a data-link-type="dfn" href="#client" id="ref-for-client①⓪②">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦①">authenticator</a> means the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪③">client</a> can enforce the <a data-link-type="dfn" href="#scope" id="ref-for-scope②⓪">scope</a> restrictions for <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential②②">credentials</a>.
-By contrast, if the communication between <a data-link-type="dfn" href="#client" id="ref-for-client①⓪④">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦②">authenticator</a> is mediated by some third party,
-then the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑤">client</a> has to trust the third party to
+   <p>Direct communication between <a data-link-type="dfn" href="#client" id="ref-for-client①⓪④">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦①">authenticator</a> means the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑤">client</a> can enforce the <a data-link-type="dfn" href="#scope" id="ref-for-scope②⓪">scope</a> restrictions for <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential②②">credentials</a>.
+By contrast, if the communication between <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑥">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦②">authenticator</a> is mediated by some third party,
+then the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑦">client</a> has to trust the third party to
 enforce the <a data-link-type="dfn" href="#scope" id="ref-for-scope②①">scope</a> restrictions and control access to the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦③">authenticator</a>.
 Failure to do either could result in
-a malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑥">Relying Party</a> receiving <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①⑤">authentication assertions</a> valid for other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑦">Relying Parties</a>,
+a malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑧">Relying Party</a> receiving <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①⑤">authentication assertions</a> valid for other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑨">Relying Parties</a>,
 or in a malicious user gaining access to <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①⑥">authentication assertions</a> for other users.</p>
-   <p>If designing a solution where the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦④">authenticator</a> does not need to be physically close to the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑥">client</a>,
-or where <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑦">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦⑤">authenticator</a> do not communicate directly,
+   <p>If designing a solution where the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦④">authenticator</a> does not need to be physically close to the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑧">client</a>,
+or where <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑨">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦⑤">authenticator</a> do not communicate directly,
 designers SHOULD consider how this affects the enforcement of <a data-link-type="dfn" href="#scope" id="ref-for-scope②②">scope</a> restrictions
 and the strength of the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦⑥">authenticator</a> as a <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②⑦">something you have</a> authentication factor.</p>
    <h3 class="heading settled" data-level="13.3" id="sctn-security-considerations-authenticator"><span class="secno">13.3. </span><span class="content">Security considerations for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦⑦">authenticators</a> <span id="sctn-attestation-security-considerations"></span></span><a class="self-link" href="#sctn-security-considerations-authenticator"></a></h3>
@@ -8586,44 +8707,44 @@ <h4 class="heading settled" data-level="13.3.1" id="sctn-cert-hierarchy"><span c
    <h4 class="heading settled" data-level="13.3.2" id="sctn-ca-compromise"><span class="secno">13.3.2. </span><span class="content">Attestation Certificate and Attestation Certificate CA Compromise</span><a class="self-link" href="#sctn-ca-compromise"></a></h4>
    <p>When an intermediate CA or a root CA used for issuing attestation certificates is compromised, <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①③">WebAuthn Authenticator</a> <a data-link-type="dfn" href="#attestation-key-pair" id="ref-for-attestation-key-pair⑥">attestation key pairs</a> are still safe although their certificates can no longer be trusted. A <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①④">WebAuthn Authenticator</a> manufacturer that
 has recorded the <a data-link-type="dfn" href="#attestation-public-key" id="ref-for-attestation-public-key①">attestation public keys</a> for their <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦⑧">authenticator</a> models can issue new <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate⑨">attestation certificates</a> for these keys from a new
-intermediate CA or from a new root CA. If the root CA changes, the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑦">WebAuthn Relying Parties</a> MUST update their trusted root certificates
+intermediate CA or from a new root CA. If the root CA changes, the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑧">WebAuthn Relying Parties</a> MUST update their trusted root certificates
 accordingly.</p>
    <p>A <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①⑤">WebAuthn Authenticator</a> <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①⓪">attestation certificate</a> MUST be revoked by the issuing CA if its <a data-link-type="dfn" href="#attestation-private-key" id="ref-for-attestation-private-key⑤">private key</a> has been compromised. A WebAuthn
 Authenticator manufacturer may need to ship a firmware update and inject new <a data-link-type="dfn" href="#attestation-private-key" id="ref-for-attestation-private-key⑥">attestation private keys</a> and <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①①">certificates</a> into already
 manufactured <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①⑥">WebAuthn Authenticators</a>, if the exposure was due to a firmware flaw. (The process by which this happens is out of
 scope for this specification.) If the <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①⑦">WebAuthn Authenticator</a> manufacturer does not have this capability, then it may not be
-possible for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑧">Relying Parties</a> to trust any further <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④⑧">attestation statements</a> from the affected <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①⑧">WebAuthn Authenticators</a>.</p>
-   <p>See also the related security consideration for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑨">Relying Parties</a> in <a href="#sctn-revoked-attestation-certificates">§ 13.4.5 Revoked Attestation Certificates</a>.</p>
-   <h3 class="heading settled" data-level="13.4" id="sctn-security-considerations-rp"><span class="secno">13.4. </span><span class="content">Security considerations for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⓪">Relying Parties</a></span><a class="self-link" href="#sctn-security-considerations-rp"></a></h3>
+possible for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⓪">Relying Parties</a> to trust any further <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④⑧">attestation statements</a> from the affected <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①⑧">WebAuthn Authenticators</a>.</p>
+   <p>See also the related security consideration for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥①">Relying Parties</a> in <a href="#sctn-revoked-attestation-certificates">§ 13.4.5 Revoked Attestation Certificates</a>.</p>
+   <h3 class="heading settled" data-level="13.4" id="sctn-security-considerations-rp"><span class="secno">13.4. </span><span class="content">Security considerations for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥②">Relying Parties</a></span><a class="self-link" href="#sctn-security-considerations-rp"></a></h3>
    <h4 class="heading settled" data-level="13.4.1" id="sctn-rp-benefits"><span class="secno">13.4.1. </span><span class="content">Security Benefits for WebAuthn Relying Parties</span><a class="self-link" href="#sctn-rp-benefits"></a></h4>
-   <p>The main benefits offered to <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑧">WebAuthn Relying Parties</a> by this specification include:</p>
+   <p>The main benefits offered to <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑨">WebAuthn Relying Parties</a> by this specification include:</p>
    <ol>
     <li data-md>
      <p>Users and accounts can be secured using widely compatible, easy-to-use multi-factor authentication.</p>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥①">Relying Party</a> does not need to provision <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦⑨">authenticator</a> hardware to its users. Instead, each user can independently obtain
-any conforming <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⓪">authenticator</a> and use that same <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧①">authenticator</a> with any number of <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥②">Relying Parties</a>. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥③">Relying Party</a> can optionally
+     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥③">Relying Party</a> does not need to provision <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦⑨">authenticator</a> hardware to its users. Instead, each user can independently obtain
+any conforming <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⓪">authenticator</a> and use that same <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧①">authenticator</a> with any number of <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥④">Relying Parties</a>. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⑤">Relying Party</a> can optionally
 enforce requirements on <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧②">authenticators</a>' security properties by inspecting the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④⑨">attestation statements</a> returned from the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧③">authenticators</a>.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑤">Authentication ceremonies</a> are resistant to <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186">man-in-the-middle attacks</a>.
 Regarding <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑨">registration ceremonies</a>, see <a href="#sctn-attestation-limitations">§ 13.4.4 Attestation Limitations</a>, below.</p>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥④">Relying Party</a> can automatically support multiple types of <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤⑥">user verification</a> - for example PIN, biometrics and/or future
+     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⑥">Relying Party</a> can automatically support multiple types of <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤⑥">user verification</a> - for example PIN, biometrics and/or future
 methods - with little or no code change, and can let each user decide which they prefer to use via their choice of <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧④">authenticator</a>.</p>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⑤">Relying Party</a> does not need to store additional secrets in order to gain the above benefits.</p>
+     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⑦">Relying Party</a> does not need to store additional secrets in order to gain the above benefits.</p>
    </ol>
-   <p>As stated in the <a href="#sctn-conforming-relying-parties">Conformance</a> section, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⑥">Relying Party</a> MUST behave as described in <a href="#sctn-rp-operations">§ 7 WebAuthn Relying Party Operations</a> to obtain all of the above security benefits. However, one notable use case that departs slightly from this is described below in <a href="#sctn-attestation-limitations">§ 13.4.4 Attestation Limitations</a>.</p>
+   <p>As stated in the <a href="#sctn-conforming-relying-parties">Conformance</a> section, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⑧">Relying Party</a> MUST behave as described in <a href="#sctn-rp-operations">§ 7 WebAuthn Relying Party Operations</a> to obtain all of the above security benefits. However, one notable use case that departs slightly from this is described below in <a href="#sctn-attestation-limitations">§ 13.4.4 Attestation Limitations</a>.</p>
    <h4 class="heading settled" data-level="13.4.2" id="sctn-seccons-visibility"><span class="secno">13.4.2. </span><span class="content">Visibility Considerations for Embedded Usage</span><a class="self-link" href="#sctn-seccons-visibility"></a></h4>
-   <p>Simplistic use of WebAuthn in an embedded context, e.g., within <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element" id="ref-for-the-iframe-element④">iframe</a></code>s as described in <a href="#sctn-iframe-guidance">§ 5.10 Using Web Authentication within iframe elements</a>, may make users vulnerable to <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ui-redressing">UI Redressing</dfn> attacks, also known as "<a href="https://en.wikipedia.org/wiki/Clickjacking">Clickjacking</a>". This is where an attacker overlays their own UI on top of a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⑦">Relying Party</a>'s intended UI and attempts to trick the user into performing unintended actions with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⑧">Relying Party</a>. For example, using these techniques, an attacker might be able to trick users into purchasing items, transferring money, etc.</p>
-   <p>Even though WebAuthn-specific UI is typically handled by the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤⑤">client platform</a> and thus is not vulnerable to <a data-link-type="dfn" href="#ui-redressing" id="ref-for-ui-redressing①">UI Redressing</a>, it is likely important for an <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⑨">Relying Party</a> having embedded WebAuthn-wielding content to ensure that their content’s UI is visible to the user. An emerging means to do so is by observing the status of the experimental <a href="https://w3c.github.io/IntersectionObserver/v2/">Intersection Observer v2</a>'s <code>isVisible</code> attribute. For example, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦⓪">Relying Party</a>'s script running in the embedded context could pre-emptively load itself in a popup window if it detects <code>isVisble</code> being set to <code>false</code>, thus side-stepping any occlusion of their content.</p>
+   <p>Simplistic use of WebAuthn in an embedded context, e.g., within <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element" id="ref-for-the-iframe-element④">iframe</a></code>s as described in <a href="#sctn-iframe-guidance">§ 5.10 Using Web Authentication within iframe elements</a>, may make users vulnerable to <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ui-redressing">UI Redressing</dfn> attacks, also known as "<a href="https://en.wikipedia.org/wiki/Clickjacking">Clickjacking</a>". This is where an attacker overlays their own UI on top of a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⑨">Relying Party</a>'s intended UI and attempts to trick the user into performing unintended actions with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦⓪">Relying Party</a>. For example, using these techniques, an attacker might be able to trick users into purchasing items, transferring money, etc.</p>
+   <p>Even though WebAuthn-specific UI is typically handled by the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤⑤">client platform</a> and thus is not vulnerable to <a data-link-type="dfn" href="#ui-redressing" id="ref-for-ui-redressing①">UI Redressing</a>, it is likely important for an <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦①">Relying Party</a> having embedded WebAuthn-wielding content to ensure that their content’s UI is visible to the user. An emerging means to do so is by observing the status of the experimental <a href="https://w3c.github.io/IntersectionObserver/v2/">Intersection Observer v2</a>'s <code>isVisible</code> attribute. For example, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦②">Relying Party</a>'s script running in the embedded context could pre-emptively load itself in a popup window if it detects <code>isVisble</code> being set to <code>false</code>, thus side-stepping any occlusion of their content.</p>
    <h4 class="heading settled" data-level="13.4.3" id="sctn-cryptographic-challenges"><span class="secno">13.4.3. </span><span class="content">Cryptographic Challenges</span><a class="self-link" href="#sctn-cryptographic-challenges"></a></h4>
    <p>As a cryptographic protocol, Web Authentication is dependent upon randomized challenges
 to avoid replay attacks. Therefore, the values of both <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions①③">PublicKeyCredentialCreationOptions</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-challenge" id="ref-for-dom-publickeycredentialcreationoptions-challenge④">challenge</a></code> and <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions①③">PublicKeyCredentialRequestOptions</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-challenge" id="ref-for-dom-publickeycredentialrequestoptions-challenge④">challenge</a></code> MUST be randomly generated
-by <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦①">Relying Parties</a> in an environment they trust (e.g., on the server-side), and the
+by <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦③">Relying Parties</a> in an environment they trust (e.g., on the server-side), and the
 returned <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-challenge" id="ref-for-dom-collectedclientdata-challenge⑧">challenge</a></code> value in the client’s
 response MUST match what was generated. This SHOULD be done in a fashion that does not rely
-upon a client’s behavior, e.g., the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦②">Relying Party</a> SHOULD store the challenge temporarily
+upon a client’s behavior, e.g., the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦④">Relying Party</a> SHOULD store the challenge temporarily
 until the operation is complete. Tolerating a mismatch will compromise the security
 of the protocol.</p>
    <p>Challenges SHOULD be valid for a duration similar to the
@@ -8633,114 +8754,118 @@ <h4 class="heading settled" data-level="13.4.3" id="sctn-cryptographic-challenge
    <h4 class="heading settled" data-level="13.4.4" id="sctn-attestation-limitations"><span class="secno">13.4.4. </span><span class="content">Attestation Limitations</span><a class="self-link" href="#sctn-attestation-limitations"></a></h4>
    <p><em>This section is not normative.</em></p>
    <p>When <a href="#sctn-registering-a-new-credential">registering a new credential</a>, the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑤⓪">attestation statement</a>, if present,
-may allow the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑨">WebAuthn Relying Party</a> to derive assurances about various <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑤">authenticator</a> qualities.
+may allow the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤⓪">WebAuthn Relying Party</a> to derive assurances about various <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑤">authenticator</a> qualities.
 For example, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑥">authenticator</a> model, or how it stores and protects <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①⑦">credential private keys</a>.
 However, it is important to note that an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑤①">attestation statement</a>, on its own,
-provides no means for a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦③">Relying Party</a> to verify that an <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①⑨">attestation object</a> was generated
+provides no means for a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦⑤">Relying Party</a> to verify that an <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①⑨">attestation object</a> was generated
 by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑦">authenticator</a> the user intended, and not by a <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186①">man-in-the-middle attacker</a>.
-For example, such an attacker could use malicious code injected into <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦④">Relying Party</a> script.
-The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦⑤">Relying Party</a> must therefore rely on other means, e.g., TLS and related technologies,
+For example, such an attacker could use malicious code injected into <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦⑥">Relying Party</a> script.
+The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦⑦">Relying Party</a> must therefore rely on other means, e.g., TLS and related technologies,
 to protect the <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object②⓪">attestation object</a> from <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186②">man-in-the-middle attacks</a>.</p>
    <p>Under the assumption that a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②⓪">registration ceremony</a> is completed securely, and that the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑧">authenticator</a> maintains
 confidentiality of the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①⑧">credential private key</a>, subsequent <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑥">authentication ceremonies</a> using that <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤⑧">public key
 credential</a> are resistant to tampering by <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186③">man-in-the-middle attacks</a>.</p>
-   <p>The discussion above holds for all <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type②④">attestation types</a>. In all cases it is possible for a <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186④">man-in-the-middle attacker</a> to replace the <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②⑧">PublicKeyCredential</a></code> object, including the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑤②">attestation statement</a> and the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑥">credential public key</a> to be registered, and subsequently tamper with future <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①⑦">authentication assertions</a> <a data-link-type="dfn" href="#scope" id="ref-for-scope②③">scoped</a> for the
-same <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦⑥">Relying Party</a> and passing through the same attacker.</p>
-   <p>Such an attack would potentially be detectable; since the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦⑦">Relying Party</a> has registered the attacker’s <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑦">credential public key</a> rather
-than the user’s, the attacker must tamper with all subsequent <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑦">authentication ceremonies</a> with that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦⑧">Relying Party</a>: unscathed
+   <p>The discussion above holds for all <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type②④">attestation types</a>. In all cases it is possible for a <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186④">man-in-the-middle attacker</a> to replace the <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②⑨">PublicKeyCredential</a></code> object, including the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑤②">attestation statement</a> and the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑥">credential public key</a> to be registered, and subsequently tamper with future <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①⑦">authentication assertions</a> <a data-link-type="dfn" href="#scope" id="ref-for-scope②③">scoped</a> for the
+same <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦⑧">Relying Party</a> and passing through the same attacker.</p>
+   <p>Such an attack would potentially be detectable; since the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦⑨">Relying Party</a> has registered the attacker’s <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑦">credential public key</a> rather
+than the user’s, the attacker must tamper with all subsequent <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑦">authentication ceremonies</a> with that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧⓪">Relying Party</a>: unscathed
 ceremonies will fail, potentially revealing the attack.</p>
-   <p><a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type②⑤">Attestation types</a> other than <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑨">Self Attestation</a> and <a data-link-type="dfn" href="#none" id="ref-for-none⑨">None</a> can increase the difficulty of such attacks, since <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑦⑨">Relying Parties</a> can possibly display <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑨">authenticator</a> information, e.g., model designation, to the user. An attacker might therefore need to use
-a genuine <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨⓪">authenticator</a> of the same model as the user’s <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨①">authenticator</a>, or the user might notice that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧⓪">Relying Party</a> reports
+   <p><a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type②⑤">Attestation types</a> other than <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑨">Self Attestation</a> and <a data-link-type="dfn" href="#none" id="ref-for-none⑨">None</a> can increase the difficulty of such attacks, since <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧①">Relying Parties</a> can possibly display <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑨">authenticator</a> information, e.g., model designation, to the user. An attacker might therefore need to use
+a genuine <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨⓪">authenticator</a> of the same model as the user’s <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨①">authenticator</a>, or the user might notice that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧②">Relying Party</a> reports
 a different <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨②">authenticator</a> model than the user expects.</p>
    <p class="note" role="note"><span class="marker">Note:</span> All variants of <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186⑤">man-in-the-middle attacks</a> described above are more difficult for an attacker to mount
 than a <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186⑥">man-in-the-middle attack</a> against conventional password authentication.</p>
    <h4 class="heading settled" data-level="13.4.5" id="sctn-revoked-attestation-certificates"><span class="secno">13.4.5. </span><span class="content">Revoked Attestation Certificates</span><a class="self-link" href="#sctn-revoked-attestation-certificates"></a></h4>
-   <p>If <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①②">attestation certificate</a> validation fails due to a revoked intermediate attestation CA certificate, and the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧①">Relying Party</a>'s policy
-requires rejecting the registration/authentication request in these situations, then it is RECOMMENDED that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧②">Relying Party</a> also
+   <p>If <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①②">attestation certificate</a> validation fails due to a revoked intermediate attestation CA certificate, and the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧③">Relying Party</a>'s policy
+requires rejecting the registration/authentication request in these situations, then it is RECOMMENDED that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧④">Relying Party</a> also
 un-registers (or marks with a trust level equivalent to "<a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation②⓪">self attestation</a>") <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤⑨">public key credentials</a> that were registered
 after the CA compromise date using an <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①③">attestation certificate</a> chaining up to the same intermediate CA. It is thus RECOMMENDED
-that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧③">Relying Parties</a> remember intermediate attestation CA certificates during <a data-link-type="dfn" href="#registration" id="ref-for-registration②③">registration</a> in order to un-register
+that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧⑤">Relying Parties</a> remember intermediate attestation CA certificates during <a data-link-type="dfn" href="#registration" id="ref-for-registration②③">registration</a> in order to un-register
 related <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⓪">public key credentials</a> if the <a data-link-type="dfn" href="#registration" id="ref-for-registration②④">registration</a> was performed after revocation of such certificates.</p>
    <p>See also the related security consideration for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨③">authenticators</a> in <a href="#sctn-ca-compromise">§ 13.3.2 Attestation Certificate and Attestation Certificate CA Compromise</a>.</p>
    <h4 class="heading settled" data-level="13.4.6" id="sctn-credential-loss-key-mobility"><span class="secno">13.4.6. </span><span class="content">Credential Loss and Key Mobility</span><a class="self-link" href="#sctn-credential-loss-key-mobility"></a></h4>
    <p>This specification defines no protocol for backing up <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①⑨">credential private keys</a>, or for sharing them between <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨④">authenticators</a>.
 In general, it is expected that a <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key②⓪">credential private key</a> never leaves the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨⑤">authenticator</a> that created it. Losing an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨⑥">authenticator</a> therefore, in general, means losing all <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥①">credentials</a> <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential①⑤">bound</a> to the
-lost <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨⑦">authenticator</a>, which could lock the user out of an account if the user has only one <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥②">credential</a> registered with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧④">Relying Party</a>. Instead of backing up or sharing private keys, the Web Authentication API allows registering
+lost <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨⑦">authenticator</a>, which could lock the user out of an account if the user has only one <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥②">credential</a> registered with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧⑥">Relying Party</a>. Instead of backing up or sharing private keys, the Web Authentication API allows registering
 multiple <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥③">credentials</a> for the same user. For example, a user might register <a data-link-type="dfn" href="#platform-credential" id="ref-for-platform-credential②">platform credentials</a> on
 frequently used <a data-link-type="dfn" href="#client-device" id="ref-for-client-device④⑤">client devices</a>, and one or more <a data-link-type="dfn" href="#roaming-credential" id="ref-for-roaming-credential①">roaming credentials</a> for use as backup and with new or rarely used <a data-link-type="dfn" href="#client-device" id="ref-for-client-device④⑥">client
 devices</a>.</p>
-   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧⑤">Relying Parties</a> SHOULD allow and encourage users to register multiple <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥④">credentials</a> to the same <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⑦">user account</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧⑥">Relying Parties</a> SHOULD make use of the <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials②">excludeCredentials</a></code></code> and <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user⑦">user</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id⑨">id</a></code></code> options to ensure that these
+   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧⑦">Relying Parties</a> SHOULD allow and encourage users to register multiple <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥④">credentials</a> to the same <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⑦">user account</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧⑧">Relying Parties</a> SHOULD make use of the <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials②">excludeCredentials</a></code></code> and <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user⑦">user</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id⑨">id</a></code></code> options to ensure that these
 different <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑤">credentials</a> are <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential①⑥">bound</a> to different <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨⑧">authenticators</a>.</p>
    <h4 class="heading settled" data-level="13.4.7" id="sctn-unprotected-account-detection"><span class="secno">13.4.7. </span><span class="content">Unprotected account detection</span><a class="self-link" href="#sctn-unprotected-account-detection"></a></h4>
    <p><em>This section is not normative.</em></p>
-   <p>This security consideration applies to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧⑦">Relying Parties</a> that support <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑧">authentication ceremonies</a> with a non-<a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty①②">empty</a> <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⑦">allowCredentials</a></code> argument as the first authentication step.
+   <p>This security consideration applies to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧⑨">Relying Parties</a> that support <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑧">authentication ceremonies</a> with a non-<a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty①②">empty</a> <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⑦">allowCredentials</a></code> argument as the first authentication step.
 For example, if using authentication with <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential①⑤">server-side credentials</a> as the first authentication step.</p>
    <p>In this case the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⑧">allowCredentials</a></code> argument risks leaking information
 about which <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⑧">user accounts</a> have WebAuthn credentials registered and which do not,
 which may be a signal of account protection strength.
 For example, say an attacker can initiate an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑨">authentication ceremony</a> by providing only a username,
-and the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧⑧">Relying Party</a> responds with a non-empty <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⑨">allowCredentials</a></code> for some <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⑨">user accounts</a>,
+and the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨⓪">Relying Party</a> responds with a non-empty <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⑨">allowCredentials</a></code> for some <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⑨">user accounts</a>,
 and with failure or a password challenge for other <a data-link-type="dfn" href="#user-account" id="ref-for-user-account④⓪">user accounts</a>.
 The attacker can then conclude that the latter <a data-link-type="dfn" href="#user-account" id="ref-for-user-account④①">user accounts</a> likely do not require a WebAuthn <a data-link-type="dfn" href="#assertion" id="ref-for-assertion①②">assertion</a> for successful authentication,
 and thus focus an attack on those likely weaker accounts.</p>
    <p>This issue is similar to the one described in <a href="#sctn-username-enumeration">§ 14.6.2 Username Enumeration</a> and <a href="#sctn-credential-id-privacy-leak">§ 14.6.3 Privacy leak via credential IDs</a>, and can be mitigated in similar ways.</p>
    <h4 class="heading settled" data-level="13.4.8" id="sctn-code-injection"><span class="secno">13.4.8. </span><span class="content">Code injection attacks</span><a class="self-link" href="#sctn-code-injection"></a></h4>
-   <p>Any malicious code executing on an <a data-link-type="dfn" href="#determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised" id="ref-for-determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised⑤">origin</a> within the <a data-link-type="dfn" href="#scope" id="ref-for-scope②④">scope</a> of a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑧⑨">Relying Party</a>'s <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑥">public key credentials</a> has the potential to invalidate any and all security guarantees WebAuthn may provide. <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client①⑤">WebAuthn Clients</a> only expose the WebAuthn API in <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#secure-context" id="ref-for-secure-context①">secure contexts</a>,
-which mitigates the most basic attacks but SHOULD be combined with additional precautions by <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨⓪">Relying Parties</a>.</p>
+   <p>Any malicious code executing on an <a data-link-type="dfn" href="#determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised" id="ref-for-determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised⑦">origin</a> within the <a data-link-type="dfn" href="#scope" id="ref-for-scope②④">scope</a> of a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨①">Relying Party</a>'s <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑥">public key credentials</a> has the potential to invalidate any and all security guarantees WebAuthn may provide. <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client①⑨">WebAuthn Clients</a> only expose the WebAuthn API in <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#secure-context" id="ref-for-secure-context①">secure contexts</a>,
+which mitigates the most basic attacks but SHOULD be combined with additional precautions by <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨②">Relying Parties</a>.</p>
    <p>Code injection can happen in several ways;
 this section attempts to point out some likely scenarios and suggest suitable mitigations,
 but is not an exhaustive list.</p>
    <ul>
     <li data-md>
-     <p>Malicous code could be injected by a third-party script included by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨①">Relying Party</a>,
+     <p>Malicous code could be injected by a third-party script included by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨③">Relying Party</a>,
 either intentionally or due to a security vulnerability in the third party.</p>
-     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨②">Relying Party</a> therefore SHOULD limit the amount of third-party script included on the <a data-link-type="dfn" href="#determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised" id="ref-for-determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised⑥">origins</a> within the <a data-link-type="dfn" href="#scope" id="ref-for-scope②⑤">scope</a> of its <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential②③">credentials</a>.</p>
-     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨③">Relying Party</a> SHOULD use Content Security Policy <a data-link-type="biblio" href="#biblio-csp2" title="Content Security Policy Level 2">[CSP2]</a>,
-and/or other appropriate technologies available at the time, to limit what script can run on its <a data-link-type="dfn" href="#determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised" id="ref-for-determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised⑦">origins</a>.</p>
+     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨④">Relying Party</a> therefore SHOULD limit the amount of third-party script included on the <a data-link-type="dfn" href="#determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised" id="ref-for-determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised⑧">origins</a> within the <a data-link-type="dfn" href="#scope" id="ref-for-scope②⑤">scope</a> of its <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential②③">credentials</a>.</p>
+     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨⑤">Relying Party</a> SHOULD use Content Security Policy <a data-link-type="biblio" href="#biblio-csp2" title="Content Security Policy Level 2">[CSP2]</a>,
+and/or other appropriate technologies available at the time, to limit what script can run on its <a data-link-type="dfn" href="#determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised" id="ref-for-determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised⑨">origins</a>.</p>
     <li data-md>
-     <p>Malicious code could, by the credential <a data-link-type="dfn" href="#scope" id="ref-for-scope②⑥">scope</a> rules, be hosted on a subdomain of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤⓪">RP ID</a>.
-For example, user-submitted code hosted on <code>usercontent.example.org</code> could exercise any <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential②④">credentials</a> <a data-link-type="dfn" href="#scope" id="ref-for-scope②⑦">scoped</a> to the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤①">RP ID</a> <code>example.org</code>.
-If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨④">Relying Party</a> allows a subdomain <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin⑨">origin</a></code> when <a href="#rp-op-verifying-assertion-step-origin">verifying the assertion</a>,
+     <p>Malicious code could, by the credential <a data-link-type="dfn" href="#scope" id="ref-for-scope②⑥">scope</a> rules, be hosted on a subdomain of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤③">RP ID</a>.
+For example, user-submitted code hosted on <code>usercontent.example.org</code> could exercise any <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential②④">credentials</a> <a data-link-type="dfn" href="#scope" id="ref-for-scope②⑦">scoped</a> to the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤④">RP ID</a> <code>example.org</code>.
+If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨⑥">Relying Party</a> allows a subdomain <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin⑨">origin</a></code> when <a href="#rp-op-verifying-assertion-step-origin">verifying the assertion</a>,
 malicious users could use this to launch a <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186⑦">man-in-the-middle attack</a> to obtain valid <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①⑧">authentication assertions</a> and impersonate the victims of the attack.</p>
-     <p>Therefore, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨⑤">Relying Party</a> by default SHOULD NOT allow a subdomain <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①⓪">origin</a></code> when <a href="#rp-op-verifying-assertion-step-origin">verifying the assertion</a>.
-If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨⑥">Relying Party</a> needs to allow a subdomain <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①①">origin</a></code>,
-then the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨⑦">Relying Party</a> MUST NOT serve untrusted code on any allowed subdomain of <a data-link-type="dfn" href="#determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised" id="ref-for-determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised⑧">origins</a> within the <a data-link-type="dfn" href="#scope" id="ref-for-scope②⑧">scope</a> of its <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑦">public key credentials</a>.</p>
+     <p>Therefore, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨⑦">Relying Party</a> by default SHOULD NOT allow a subdomain <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①⓪">origin</a></code> when <a href="#rp-op-verifying-assertion-step-origin">verifying the assertion</a>.
+If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨⑧">Relying Party</a> needs to allow a subdomain <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①①">origin</a></code>,
+then the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨⑨">Relying Party</a> MUST NOT serve untrusted code on any allowed subdomain of <a data-link-type="dfn" href="#determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised" id="ref-for-determines-the-set-of-origins-on-which-the-public-key-credential-may-be-exercised①⓪">origins</a> within the <a data-link-type="dfn" href="#scope" id="ref-for-scope②⑧">scope</a> of its <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑦">public key credentials</a>.</p>
    </ul>
    <h4 class="heading settled" data-level="13.4.9" id="sctn-validating-origin"><span class="secno">13.4.9. </span><span class="content">Validating the origin of a credential</span><a class="self-link" href="#sctn-validating-origin"></a></h4>
    <p>When <a href="#rp-op-registering-a-new-credential-step-origin">registering a credential</a> and
 when <a href="#rp-op-verifying-assertion-step-origin">verifying an assertion</a>,
-the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨⑧">Relying Party</a> MUST validate the <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①②">origin</a></code> member of the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data①④">client data</a>.</p>
-   <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑨⑨">Relying Party</a> MUST NOT accept unexpected values of <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①③">origin</a></code>,
+the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪⓪">Relying Party</a> MUST validate the <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①②">origin</a></code> member of the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data①④">client data</a>.</p>
+   <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪①">Relying Party</a> MUST NOT accept unexpected values of <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①③">origin</a></code>,
 as doing so could allow a malicious website to obtain valid <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential②⑤">credentials</a>.
 Although the <a data-link-type="dfn" href="#scope" id="ref-for-scope②⑨">scope</a> of WebAuthn credentials prevents their use on domains
-outside the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤②">RP ID</a> they were registered for,
-the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪⓪">Relying Party</a>'s origin validation serves as an additional layer of protection
+outside the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤⑤">RP ID</a> they were registered for,
+the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪②">Relying Party</a>'s origin validation serves as an additional layer of protection
 in case a faulty <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨⑨">authenticator</a> fails to enforce credential <a data-link-type="dfn" href="#scope" id="ref-for-scope③⓪">scope</a>.
 See also <a href="#sctn-code-injection">§ 13.4.8 Code injection attacks</a> for discussion of potentially malicious subdomains.</p>
-   <p>Validation MAY be performed by exact string matching or any other method as needed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪①">Relying Party</a>.
+   <p>Validation MAY be performed by exact string matching or any other method as needed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪③">Relying Party</a>.
 For example:</p>
    <ul>
     <li data-md>
      <p>A web application served only at <code>https://example.org</code> SHOULD require <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①④">origin</a></code> to exactly equal <code>https://example.org</code>.</p>
      <p>This is the simplest case, where <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①⑤">origin</a></code> is expected
-to be the string <code>https://</code> followed by the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤③">RP ID</a>.</p>
+to be the string <code>https://</code> followed by the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤⑥">RP ID</a>.</p>
     <li data-md>
      <p>A web application served at a small number of domains might require <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①⑥">origin</a></code> to exactly equal some element of a list of allowed origins,
 for example the list <code>["https://example.org", "https://login.example.org"]</code>.</p>
     <li data-md>
-     <p>A web application served at a large set of domains that changes often might parse <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①⑦">origin</a></code> structurally and require that the URL scheme is <code>https</code> and that the authority equals or is any subdomain of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤④">RP ID</a> - for example, <code>example.org</code> or any subdomain of <code>example.org</code>).</p>
-     <p class="note" role="note"><span class="marker">Note:</span> See <a href="#sctn-code-injection">§ 13.4.8 Code injection attacks</a> for a discussion of the risks of allowing any subdomain of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤⑤">RP ID</a>.</p>
+     <p>A web application leveraging <a href="#sctn-related-origins">related origin requests</a> might also require <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①⑦">origin</a></code> to exactly equal some element of a list of allowed origins,
+for example the list <code>["https://example.co.uk", "https://example.de", "https://myexamplerewards.com"]</code>.
+This list will typically match the origins listed in the well-known URI for the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤⑦">RP ID</a>. See <a href="#sctn-related-origins">§ 5.11 Using Web Authentication across related origins</a>.</p>
+    <li data-md>
+     <p>A web application served at a large set of domains that changes often might parse <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①⑧">origin</a></code> structurally and require that the URL scheme is <code>https</code> and that the authority equals or is any subdomain of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤⑧">RP ID</a> - for example, <code>example.org</code> or any subdomain of <code>example.org</code>).</p>
+     <p class="note" role="note"><span class="marker">Note:</span> See <a href="#sctn-code-injection">§ 13.4.8 Code injection attacks</a> for a discussion of the risks of allowing any subdomain of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id⑤⑨">RP ID</a>.</p>
     <li data-md>
-     <p>A web application with a companion native application might allow <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①⑧">origin</a></code> to be an operating system dependent
-identifier for the native application. For example, such a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪②">Relying Party</a> might require that <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①⑨">origin</a></code> exactly equals some element of the list <code>["https://example.org", "example-os:appid:204ffa1a5af110ac483f131a1bef8a841a7adb0d8d135908bbd964ed05d2653b"]</code>.</p>
+     <p>A web application with a companion native application might allow <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①⑨">origin</a></code> to be an operating system dependent
+identifier for the native application. For example, such a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪④">Relying Party</a> might require that <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin②⓪">origin</a></code> exactly equals some element of the list <code>["https://example.org", "example-os:appid:204ffa1a5af110ac483f131a1bef8a841a7adb0d8d135908bbd964ed05d2653b"]</code>.</p>
    </ul>
    <p>Similar considerations apply when validating the <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-toporigin" id="ref-for-dom-collectedclientdata-toporigin①①">topOrigin</a></code> member of the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data①⑤">client data</a>.
-When <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-toporigin" id="ref-for-dom-collectedclientdata-toporigin①②">topOrigin</a></code> is present, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪③">Relying Party</a> MUST validate that its value is expected.
-This validation MAY be performed by exact string matching or any other method as needed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪④">Relying Party</a>.
+When <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-toporigin" id="ref-for-dom-collectedclientdata-toporigin①②">topOrigin</a></code> is present, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪⑤">Relying Party</a> MUST validate that its value is expected.
+This validation MAY be performed by exact string matching or any other method as needed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪⑥">Relying Party</a>.
 For example:</p>
    <ul>
     <li data-md>
-     <p>A web application that does not wish to be embedded in a cross-origin <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element" id="ref-for-the-iframe-element⑤">iframe</a></code> might require <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-toporigin" id="ref-for-dom-collectedclientdata-toporigin①③">topOrigin</a></code> to exactly equal <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin②⓪">origin</a></code>.</p>
+     <p>A web application that does not wish to be embedded in a cross-origin <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element" id="ref-for-the-iframe-element⑤">iframe</a></code> might require <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-toporigin" id="ref-for-dom-collectedclientdata-toporigin①③">topOrigin</a></code> to exactly equal <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin②①">origin</a></code>.</p>
     <li data-md>
      <p>A web application that wishes to be embedded in a cross-origin <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element" id="ref-for-the-iframe-element⑥">iframe</a></code> on a small number of domains
 might require <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-toporigin" id="ref-for-dom-collectedclientdata-toporigin①④">topOrigin</a></code> to exactly equal some element of a list of allowed origins,
@@ -8754,7 +8879,7 @@ <h2 class="heading settled" data-level="14" id="sctn-privacy-considerations"><sp
    <p>The privacy principles in <a data-link-type="biblio" href="#biblio-fido-privacy-principles" title="FIDO Privacy Principles">[FIDO-Privacy-Principles]</a> also apply to this specification.</p>
    <p>This section is divided by audience;
 general privacy considerations are direct subsections of this section,
-while privacy considerations specifically for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪⓪">authenticator</a>, <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑧">client</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪⑤">Relying Party</a> implementers
+while privacy considerations specifically for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪⓪">authenticator</a>, <a data-link-type="dfn" href="#client" id="ref-for-client①①⓪">client</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪⑦">Relying Party</a> implementers
 are grouped into respective subsections.</p>
    <h3 class="heading settled" data-level="14.1" id="sctn-privacy-attacks"><span class="secno">14.1. </span><span class="content">De-anonymization Prevention Measures</span><a class="self-link" href="#sctn-privacy-attacks"></a></h3>
    <p><em>This section is not normative.</em></p>
@@ -8765,56 +8890,56 @@ <h3 class="heading settled" data-level="14.1" id="sctn-privacy-attacks"><span cl
    <ul>
     <li data-md>
      <p>The user’s <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⑤">credential IDs</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑧">credential public keys</a>.</p>
-     <p>These are registered by the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤⓪">WebAuthn Relying Party</a> and subsequently used by the user to prove possession of the corresponding <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key②①">credential
-private key</a>. They are also visible to the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑨">client</a> in the communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪①">authenticator</a>.</p>
+     <p>These are registered by the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤①">WebAuthn Relying Party</a> and subsequently used by the user to prove possession of the corresponding <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key②①">credential
+private key</a>. They are also visible to the <a data-link-type="dfn" href="#client" id="ref-for-client①①①">client</a> in the communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪①">authenticator</a>.</p>
     <li data-md>
-     <p>The user’s identities specific to each <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪⑥">Relying Party</a>, e.g., usernames and <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②⑤">user handles</a>.</p>
-     <p>These identities are obviously used by each <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪⑦">Relying Party</a> to identify a user in their system. They are also visible to the <a data-link-type="dfn" href="#client" id="ref-for-client①①⓪">client</a> in the communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪②">authenticator</a>.</p>
+     <p>The user’s identities specific to each <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪⑧">Relying Party</a>, e.g., usernames and <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②⑤">user handles</a>.</p>
+     <p>These identities are obviously used by each <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪⑨">Relying Party</a> to identify a user in their system. They are also visible to the <a data-link-type="dfn" href="#client" id="ref-for-client①①②">client</a> in the communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪②">authenticator</a>.</p>
     <li data-md>
      <p>The user’s biometric characteristic(s), e.g., fingerprints or facial recognition data <a data-link-type="biblio" href="#biblio-isobiometricvocabulary" title="Information technology — Vocabulary — Biometrics">[ISOBiometricVocabulary]</a>.</p>
-     <p>This is optionally used by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪③">authenticator</a> to perform <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤⑦">user verification</a>. It is not revealed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪⑧">Relying Party</a>, but in
-the case of <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators③①">platform authenticators</a>, it might be visible to the <a data-link-type="dfn" href="#client" id="ref-for-client①①①">client</a> depending on the implementation.</p>
+     <p>This is optionally used by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪③">authenticator</a> to perform <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤⑦">user verification</a>. It is not revealed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①⓪">Relying Party</a>, but in
+the case of <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators③①">platform authenticators</a>, it might be visible to the <a data-link-type="dfn" href="#client" id="ref-for-client①①③">client</a> depending on the implementation.</p>
     <li data-md>
      <p>The models of the user’s <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪④">authenticators</a>, e.g., product names.</p>
-     <p>This is exposed in the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑤③">attestation statement</a> provided to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⓪⑨">Relying Party</a> during <a data-link-type="dfn" href="#registration" id="ref-for-registration②⑤">registration</a>. It is also visible to the <a data-link-type="dfn" href="#client" id="ref-for-client①①②">client</a> in the communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪⑤">authenticator</a>.</p>
+     <p>This is exposed in the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑤③">attestation statement</a> provided to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①①">Relying Party</a> during <a data-link-type="dfn" href="#registration" id="ref-for-registration②⑤">registration</a>. It is also visible to the <a data-link-type="dfn" href="#client" id="ref-for-client①①④">client</a> in the communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪⑤">authenticator</a>.</p>
     <li data-md>
      <p>The identities of the user’s <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪⑥">authenticators</a>, e.g., serial numbers.</p>
-     <p>This is possibly used by the <a data-link-type="dfn" href="#client" id="ref-for-client①①③">client</a> to enable communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪⑦">authenticator</a>, but is not exposed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①⓪">Relying Party</a>.</p>
+     <p>This is possibly used by the <a data-link-type="dfn" href="#client" id="ref-for-client①①⑤">client</a> to enable communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪⑦">authenticator</a>, but is not exposed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①②">Relying Party</a>.</p>
    </ul>
-   <p>Some of the above information is necessarily shared with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①①">Relying Party</a>. The following sections describe the measures taken to
-prevent malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①②">Relying Parties</a> from using it to discover a user’s personal identity.</p>
+   <p>Some of the above information is necessarily shared with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①③">Relying Party</a>. The following sections describe the measures taken to
+prevent malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①④">Relying Parties</a> from using it to discover a user’s personal identity.</p>
    <h3 class="heading settled" data-level="14.2" id="sctn-non-correlatable-credentials"><span class="secno">14.2. </span><span class="content">Anonymous, Scoped, Non-correlatable <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑧">Public Key Credentials</a></span><a class="self-link" href="#sctn-non-correlatable-credentials"></a></h3>
    <p><em>This section is not normative.</em></p>
-   <p>Although <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⑥">Credential IDs</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑨">credential public keys</a> are necessarily shared with the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤①">WebAuthn Relying Party</a> to enable strong
-authentication, they are designed to be minimally identifying and not shared between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①③">Relying Parties</a>.</p>
+   <p>Although <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⑥">Credential IDs</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑨">credential public keys</a> are necessarily shared with the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤②">WebAuthn Relying Party</a> to enable strong
+authentication, they are designed to be minimally identifying and not shared between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①⑤">Relying Parties</a>.</p>
    <ul>
     <li data-md>
      <p><a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⑦">Credential IDs</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key④⓪">credential public keys</a> are meaningless in isolation, as they only identify <a data-link-type="dfn" href="#credential-key-pair" id="ref-for-credential-key-pair⑦">credential key pairs</a> and not users directly.</p>
     <li data-md>
-     <p>Each <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑨">public key credential</a> is strictly <a data-link-type="dfn" href="#scope" id="ref-for-scope③①">scoped</a> to a specific <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①④">Relying Party</a>, and the <a data-link-type="dfn" href="#client" id="ref-for-client①①④">client</a> ensures that its existence is not
-revealed to other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①⑤">Relying Parties</a>. A malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①⑥">Relying Party</a> thus cannot ask the <a data-link-type="dfn" href="#client" id="ref-for-client①①⑤">client</a> to reveal a user’s other identities.</p>
+     <p>Each <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑨">public key credential</a> is strictly <a data-link-type="dfn" href="#scope" id="ref-for-scope③①">scoped</a> to a specific <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①⑥">Relying Party</a>, and the <a data-link-type="dfn" href="#client" id="ref-for-client①①⑥">client</a> ensures that its existence is not
+revealed to other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①⑦">Relying Parties</a>. A malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①⑧">Relying Party</a> thus cannot ask the <a data-link-type="dfn" href="#client" id="ref-for-client①①⑦">client</a> to reveal a user’s other identities.</p>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#client" id="ref-for-client①①⑥">client</a> also ensures that the existence of a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⓪">public key credential</a> is not revealed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①⑦">Relying Party</a> without <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent②⑥">user
-consent</a>. This is detailed further in <a href="#sctn-make-credential-privacy">§ 14.5.1 Registration Ceremony Privacy</a> and <a href="#sctn-assertion-privacy">§ 14.5.2 Authentication Ceremony Privacy</a>. A malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①⑧">Relying Party</a> thus cannot silently identify a user, even if the user has a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦①">public key credential</a> registered and available.</p>
+     <p>The <a data-link-type="dfn" href="#client" id="ref-for-client①①⑧">client</a> also ensures that the existence of a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⓪">public key credential</a> is not revealed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①⑨">Relying Party</a> without <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent②⑥">user
+consent</a>. This is detailed further in <a href="#sctn-make-credential-privacy">§ 14.5.1 Registration Ceremony Privacy</a> and <a href="#sctn-assertion-privacy">§ 14.5.2 Authentication Ceremony Privacy</a>. A malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⓪">Relying Party</a> thus cannot silently identify a user, even if the user has a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦①">public key credential</a> registered and available.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪⑧">Authenticators</a> ensure that the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⑧">credential IDs</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key④①">credential public keys</a> of different <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦②">public key credentials</a> are
-not correlatable as belonging to the same user. A pair of malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④①⑨">Relying Parties</a> thus cannot correlate users between their
+not correlatable as belonging to the same user. A pair of malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②①">Relying Parties</a> thus cannot correlate users between their
 systems without additional information, e.g., a willfully reused username or e-mail address.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪⑨">Authenticators</a> ensure that their <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①④">attestation certificates</a> are not unique enough to identify a single <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③①⓪">authenticator</a> or a small group of <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③①①">authenticators</a>. This is detailed further in <a href="#sctn-attestation-privacy">§ 14.4.1 Attestation Privacy</a>. A pair of malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⓪">Relying Parties</a> thus cannot correlate users between their systems by tracking individual <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③①②">authenticators</a>.</p>
+     <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③⓪⑨">Authenticators</a> ensure that their <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①④">attestation certificates</a> are not unique enough to identify a single <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③①⓪">authenticator</a> or a small group of <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③①①">authenticators</a>. This is detailed further in <a href="#sctn-attestation-privacy">§ 14.4.1 Attestation Privacy</a>. A pair of malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②②">Relying Parties</a> thus cannot correlate users between their systems by tracking individual <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③①②">authenticators</a>.</p>
    </ul>
    <p>Additionally, a <a data-link-type="dfn" href="#client-side-discoverable-public-key-credential-source" id="ref-for-client-side-discoverable-public-key-credential-source⑧">client-side discoverable public key credential source</a> can optionally include a <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②⑥">user
-handle</a> specified by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②①">Relying Party</a>. The <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦③">credential</a> can then be used to both identify and <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①⑥">authenticate</a> the user.
-This means that a privacy-conscious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②②">Relying Party</a> can allow creation of a <a data-link-type="dfn" href="#user-account" id="ref-for-user-account④②">user account</a> without a traditional username,
-further improving non-correlatability between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②③">Relying Parties</a>.</p>
+handle</a> specified by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②③">Relying Party</a>. The <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦③">credential</a> can then be used to both identify and <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①⑥">authenticate</a> the user.
+This means that a privacy-conscious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②④">Relying Party</a> can allow creation of a <a data-link-type="dfn" href="#user-account" id="ref-for-user-account④②">user account</a> without a traditional username,
+further improving non-correlatability between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⑤">Relying Parties</a>.</p>
    <h3 class="heading settled" data-level="14.3" id="sctn-biometric-privacy"><span class="secno">14.3. </span><span class="content">Authenticator-local <a data-link-type="dfn" href="#biometric-recognition" id="ref-for-biometric-recognition④">Biometric Recognition</a></span><a class="self-link" href="#sctn-biometric-privacy"></a></h3>
    <p><a data-link-type="dfn" href="#biometric-authenticator" id="ref-for-biometric-authenticator①">Biometric authenticators</a> perform the <a data-link-type="dfn" href="#biometric-recognition" id="ref-for-biometric-recognition⑤">biometric recognition</a> internally in the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③①③">authenticator</a> - though for <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators③②">platform
-authenticators</a> the biometric data might also be visible to the <a data-link-type="dfn" href="#client" id="ref-for-client①①⑦">client</a>, depending on the implementation. Biometric data is
-not revealed to the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤②">WebAuthn Relying Party</a>; it is used only locally to perform <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤⑧">user verification</a> authorizing the creation and <a data-link-type="dfn" href="#registration" id="ref-for-registration②⑥">registration</a> of, or <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①⑦">authentication</a> using, a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦④">public key credential</a>. A malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②④">Relying Party</a> therefore cannot discover the
-user’s personal identity via biometric data, and a security breach at a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⑤">Relying Party</a> cannot expose biometric data for an attacker to
-use for forging logins at other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⑥">Relying Parties</a>.</p>
-   <p>In the case where a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⑦">Relying Party</a> requires <a data-link-type="dfn" href="#biometric-recognition" id="ref-for-biometric-recognition⑥">biometric recognition</a>, this is performed locally by the <a data-link-type="dfn" href="#biometric-authenticator" id="ref-for-biometric-authenticator②">biometric authenticator</a> perfoming <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤⑨">user verification</a> and then signaling the result by setting the <a data-link-type="dfn" href="#authdata-flags-uv" id="ref-for-authdata-flags-uv①⑦">UV</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags⑤④">flag</a> in the signed <a data-link-type="dfn" href="#assertion" id="ref-for-assertion①③">assertion</a> response,
-instead of revealing the biometric data itself to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⑧">Relying Party</a>.</p>
+authenticators</a> the biometric data might also be visible to the <a data-link-type="dfn" href="#client" id="ref-for-client①①⑨">client</a>, depending on the implementation. Biometric data is
+not revealed to the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤③">WebAuthn Relying Party</a>; it is used only locally to perform <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤⑧">user verification</a> authorizing the creation and <a data-link-type="dfn" href="#registration" id="ref-for-registration②⑥">registration</a> of, or <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①⑦">authentication</a> using, a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦④">public key credential</a>. A malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⑥">Relying Party</a> therefore cannot discover the
+user’s personal identity via biometric data, and a security breach at a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⑦">Relying Party</a> cannot expose biometric data for an attacker to
+use for forging logins at other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⑧">Relying Parties</a>.</p>
+   <p>In the case where a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⑨">Relying Party</a> requires <a data-link-type="dfn" href="#biometric-recognition" id="ref-for-biometric-recognition⑥">biometric recognition</a>, this is performed locally by the <a data-link-type="dfn" href="#biometric-authenticator" id="ref-for-biometric-authenticator②">biometric authenticator</a> perfoming <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤⑨">user verification</a> and then signaling the result by setting the <a data-link-type="dfn" href="#authdata-flags-uv" id="ref-for-authdata-flags-uv①⑦">UV</a> <a data-link-type="dfn" href="#authdata-flags" id="ref-for-authdata-flags⑤④">flag</a> in the signed <a data-link-type="dfn" href="#assertion" id="ref-for-assertion①③">assertion</a> response,
+instead of revealing the biometric data itself to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③⓪">Relying Party</a>.</p>
    <h3 class="heading settled" data-level="14.4" id="sctn-privacy-considerations-authenticator"><span class="secno">14.4. </span><span class="content">Privacy considerations for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③①④">authenticators</a></span><a class="self-link" href="#sctn-privacy-considerations-authenticator"></a></h3>
    <h4 class="heading settled" data-level="14.4.1" id="sctn-attestation-privacy"><span class="secno">14.4.1. </span><span class="content">Attestation Privacy</span><a class="self-link" href="#sctn-attestation-privacy"></a></h4>
    <p><a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①⑤">Attestation certificates</a> and <a data-link-type="dfn" href="#attestation-key-pair" id="ref-for-attestation-key-pair⑦">attestation key pairs</a> can be used to track users
@@ -8841,42 +8966,42 @@ <h4 class="heading settled" data-level="14.4.1" id="sctn-attestation-privacy"><s
     confusion in the specific context of this specification.</p>
    </ul>
    <h4 class="heading settled" data-level="14.4.2" id="sctn-pii-privacy"><span class="secno">14.4.2. </span><span class="content">Privacy of personally identifying information Stored in Authenticators</span><a class="self-link" href="#sctn-pii-privacy"></a></h4>
-   <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③②⓪">Authenticators</a> MAY provide additional information to <a data-link-type="dfn" href="#client" id="ref-for-client①①⑧">clients</a> outside what’s defined by this specification, e.g.,
-to enable the <a data-link-type="dfn" href="#client" id="ref-for-client①①⑨">client</a> to provide a rich UI with which the user can pick which <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential②⑧">credential</a> to use for an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④⓪">authentication
+   <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③②⓪">Authenticators</a> MAY provide additional information to <a data-link-type="dfn" href="#client" id="ref-for-client①②⓪">clients</a> outside what’s defined by this specification, e.g.,
+to enable the <a data-link-type="dfn" href="#client" id="ref-for-client①②①">client</a> to provide a rich UI with which the user can pick which <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential②⑧">credential</a> to use for an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④⓪">authentication
 ceremony</a>. If an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③②①">authenticator</a> chooses to do so, it SHOULD NOT expose personally identifying information unless successful <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑥⓪">user verification</a> has been
 performed. If the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③②②">authenticator</a> supports <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑥①">user verification</a> with more than one concurrently enrolled user, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③②③">authenticator</a> SHOULD NOT expose personally identifying information of users other than the currently <a data-link-type="dfn" href="#concept-user-verified" id="ref-for-concept-user-verified④">verified</a> user. Consequently, an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③②④">authenticator</a> that is not capable of <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑥②">user verification</a> SHOULD NOT store personally identifying information.</p>
    <p>For the purposes of this discussion, the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②⑦">user handle</a> conveyed as the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id①⓪">id</a></code> member of <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialuserentity" id="ref-for-dictdef-publickeycredentialuserentity⑦">PublicKeyCredentialUserEntity</a></code> is not considered personally identifying information; see <a href="#sctn-user-handle-privacy">§ 14.6.1 User Handle Contents</a>.</p>
    <p>These recommendations serve to prevent an adversary with physical access to an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③②⑤">authenticator</a> from extracting personally identifying information about the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③②⑥">authenticator</a>'s enrolled user(s).</p>
-   <h3 class="heading settled" data-level="14.5" id="sctn-privacy-considerations-client"><span class="secno">14.5. </span><span class="content">Privacy considerations for <a data-link-type="dfn" href="#client" id="ref-for-client①②⓪">clients</a></span><a class="self-link" href="#sctn-privacy-considerations-client"></a></h3>
+   <h3 class="heading settled" data-level="14.5" id="sctn-privacy-considerations-client"><span class="secno">14.5. </span><span class="content">Privacy considerations for <a data-link-type="dfn" href="#client" id="ref-for-client①②②">clients</a></span><a class="self-link" href="#sctn-privacy-considerations-client"></a></h3>
    <h4 class="heading settled" data-level="14.5.1" id="sctn-make-credential-privacy"><span class="secno">14.5.1. </span><span class="content">Registration Ceremony Privacy</span><a class="self-link" href="#sctn-make-credential-privacy"></a></h4>
    <p>In order to protect users from being identified without <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent②⑦">consent</a>, implementations of the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-create-slot" id="ref-for-dom-publickeycredential-create-slot①②">[[Create]](origin, options, sameOriginWithAncestors)</a></code> method need to take care to not leak information that
-could enable a malicious <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤③">WebAuthn Relying Party</a> to distinguish between these cases, where "excluded" means that at least one of the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⑤">credentials</a> listed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④②⑨">Relying Party</a> in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials③">excludeCredentials</a></code> is <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential①⑦">bound</a> to the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③②⑦">authenticator</a>:</p>
+could enable a malicious <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤④">WebAuthn Relying Party</a> to distinguish between these cases, where "excluded" means that at least one of the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⑤">credentials</a> listed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③①">Relying Party</a> in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials③">excludeCredentials</a></code> is <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential①⑦">bound</a> to the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③②⑦">authenticator</a>:</p>
    <ul>
     <li data-md>
      <p>No <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③②⑧">authenticators</a> are present.</p>
     <li data-md>
      <p>At least one <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③②⑨">authenticator</a> is present, and at least one present <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③③⓪">authenticator</a> is excluded.</p>
    </ul>
-   <p>If the above cases are distinguishable, information is leaked by which a malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③⓪">Relying Party</a> could identify the user by probing for
+   <p>If the above cases are distinguishable, information is leaked by which a malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③②">Relying Party</a> could identify the user by probing for
 which <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⑥">credentials</a> are available. For example, one such information leak is if the client returns a
-failure response as soon as an excluded <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③③①">authenticator</a> becomes available. In this case - especially if the excluded <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③③②">authenticator</a> is a <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators③③">platform authenticator</a> - the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③①">Relying Party</a> could detect that the <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①④">ceremony</a> was canceled before the
+failure response as soon as an excluded <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③③①">authenticator</a> becomes available. In this case - especially if the excluded <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③③②">authenticator</a> is a <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators③③">platform authenticator</a> - the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③③">Relying Party</a> could detect that the <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①④">ceremony</a> was canceled before the
 timeout and before the user could feasibly have canceled it manually, and thus conclude that at least one of the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⑦">credentials</a> listed in the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials④">excludeCredentials</a></code> parameter is available to the user.</p>
    <p>The above is not a concern, however, if the user has <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent②⑧">consented</a> to create a new credential before a
 distinguishable error is returned, because in this case the user has confirmed intent to share the information that would be
 leaked.</p>
    <h4 class="heading settled" data-level="14.5.2" id="sctn-assertion-privacy"><span class="secno">14.5.2. </span><span class="content">Authentication Ceremony Privacy</span><a class="self-link" href="#sctn-assertion-privacy"></a></h4>
    <p>In order to protect users from being identified without <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent②⑨">consent</a>, implementations of the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-slot" id="ref-for-dom-publickeycredential-discoverfromexternalsource-slot①④">[[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors)</a></code> method need to take care to not
-leak information that could enable a malicious <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤④">WebAuthn Relying Party</a> to distinguish between these cases, where "named" means that the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⑧">credential</a> is listed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③②">Relying Party</a> in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials③⓪">allowCredentials</a></code>:</p>
+leak information that could enable a malicious <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤⑤">WebAuthn Relying Party</a> to distinguish between these cases, where "named" means that the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⑧">credential</a> is listed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③④">Relying Party</a> in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials③⓪">allowCredentials</a></code>:</p>
    <ul>
     <li data-md>
      <p>A named <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⑨">credential</a> is not available.</p>
     <li data-md>
      <p>A named <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑧⓪">credential</a> is available, but the user does not <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent③⓪">consent</a> to use it.</p>
    </ul>
-   <p>If the above cases are distinguishable, information is leaked by which a malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③③">Relying Party</a> could identify the user by probing
+   <p>If the above cases are distinguishable, information is leaked by which a malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③⑤">Relying Party</a> could identify the user by probing
 for which <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑧①">credentials</a> are available. For example, one such information leak is if the client returns a
 failure response as soon as the user denies <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent③①">consent</a> to proceed with an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④①">authentication ceremony</a>. In this
-case the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③④">Relying Party</a> could detect that the <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①⑤">ceremony</a> was canceled by the user and not the timeout, and thus conclude that at least
+case the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③⑥">Relying Party</a> could detect that the <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①⑤">ceremony</a> was canceled by the user and not the timeout, and thus conclude that at least
 one of the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑧②">credentials</a> listed in the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials③①">allowCredentials</a></code> parameter is
 available to the user.</p>
    <h4 class="heading settled" data-level="14.5.3" id="sctn-os-account-privacy"><span class="secno">14.5.3. </span><span class="content">Privacy Between Operating System Accounts</span><a class="self-link" href="#sctn-os-account-privacy"></a></h4>
@@ -8884,41 +9009,41 @@ <h4 class="heading settled" data-level="14.5.3" id="sctn-os-account-privacy"><sp
 authenticator</a> and <a data-link-type="dfn" href="#client-device" id="ref-for-client-device④⑧">client device</a> SHOULD work together to ensure that the existence of any <a data-link-type="dfn" href="#platform-credential" id="ref-for-platform-credential③">platform credential</a> is revealed
 only to the operating system user that created that <a data-link-type="dfn" href="#platform-credential" id="ref-for-platform-credential④">platform credential</a>.</p>
    <h4 class="heading settled" data-level="14.5.4" id="sctn-disclosing-client-capabilities"><span class="secno">14.5.4. </span><span class="content">Disclosing Client Capabilities</span><a class="self-link" href="#sctn-disclosing-client-capabilities"></a></h4>
-   <p>The <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientcapabilities" id="ref-for-dom-publickeycredential-getclientcapabilities①">getClientCapabilities</a></code> method assists <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤⑤">WebAuthn Relying Parties</a> in crafting registration and authentication experiences which have a high chance of success with the client and/or user.</p>
+   <p>The <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientcapabilities" id="ref-for-dom-publickeycredential-getclientcapabilities④">getClientCapabilities</a></code> method assists <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤⑥">WebAuthn Relying Parties</a> in crafting registration and authentication experiences which have a high chance of success with the client and/or user.</p>
    <p>The client’s support or lack of support of a WebAuthn capability may pose a fingerprinting risk. Client implementations MAY wish to limit capability disclosures based on client policy and/or user consent.</p>
-   <h3 class="heading settled" data-level="14.6" id="sctn-privacy-considerations-rp"><span class="secno">14.6. </span><span class="content">Privacy considerations for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③⑤">Relying Parties</a></span><a class="self-link" href="#sctn-privacy-considerations-rp"></a></h3>
+   <h3 class="heading settled" data-level="14.6" id="sctn-privacy-considerations-rp"><span class="secno">14.6. </span><span class="content">Privacy considerations for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③⑦">Relying Parties</a></span><a class="self-link" href="#sctn-privacy-considerations-rp"></a></h3>
    <h4 class="heading settled" data-level="14.6.1" id="sctn-user-handle-privacy"><span class="secno">14.6.1. </span><span class="content">User Handle Contents</span><a class="self-link" href="#sctn-user-handle-privacy"></a></h4>
    <p>Since the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②⑧">user handle</a> is not considered personally identifying information in <a href="#sctn-pii-privacy">§ 14.4.2 Privacy of personally identifying information Stored in Authenticators</a>,
 and since <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③③③">authenticators</a> MAY reveal <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②⑨">user handles</a> without first performing <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑥③">user verification</a>,
-the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③⑥">Relying Party</a> MUST NOT include personally identifying information, e.g., e-mail
+the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③⑧">Relying Party</a> MUST NOT include personally identifying information, e.g., e-mail
 addresses or usernames, in the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle③⓪">user handle</a>. This includes hash values of personally identifying information, unless the hash
-function is <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-258" id="ref-for-page-258">salted</a> with <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-258" id="ref-for-page-258①">salt</a> values private to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③⑦">Relying Party</a>, since hashing does not prevent probing for guessable input
+function is <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-258" id="ref-for-page-258">salted</a> with <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-258" id="ref-for-page-258①">salt</a> values private to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③⑨">Relying Party</a>, since hashing does not prevent probing for guessable input
 values. It is RECOMMENDED to let the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle③①">user handle</a> be 64 random bytes, and store this value in the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account④③">user account</a>.</p>
    <h4 class="heading settled" data-level="14.6.2" id="sctn-username-enumeration"><span class="secno">14.6.2. </span><span class="content">Username Enumeration</span><a class="self-link" href="#sctn-username-enumeration"></a></h4>
-   <p>While initiating a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②①">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④②">authentication ceremony</a>, there is a risk that the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤⑥">WebAuthn Relying Party</a> might leak sensitive
-information about its registered users. For example, if a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③⑧">Relying Party</a> uses e-mail addresses as usernames and an attacker attempts to
-initiate an <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①⑧">authentication</a> <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①⑥">ceremony</a> for "alex.mueller@example.com" and the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④③⑨">Relying Party</a> responds with a failure, but then
+   <p>While initiating a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②①">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④②">authentication ceremony</a>, there is a risk that the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤⑦">WebAuthn Relying Party</a> might leak sensitive
+information about its registered users. For example, if a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④⓪">Relying Party</a> uses e-mail addresses as usernames and an attacker attempts to
+initiate an <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①⑧">authentication</a> <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①⑥">ceremony</a> for "alex.mueller@example.com" and the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④①">Relying Party</a> responds with a failure, but then
 successfully initiates an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④③">authentication ceremony</a> for "j.doe@example.com", then the attacker can conclude that "j.doe@example.com"
-is registered and "alex.mueller@example.com" is not. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④⓪">Relying Party</a> has thus leaked the possibly sensitive information that
-"j.doe@example.com" has a <a data-link-type="dfn" href="#user-account" id="ref-for-user-account④④">user account</a> at this <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④①">Relying Party</a>.</p>
-   <p>The following is a non-normative, non-exhaustive list of measures the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④②">Relying Party</a> may implement to mitigate or prevent information
+is registered and "alex.mueller@example.com" is not. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④②">Relying Party</a> has thus leaked the possibly sensitive information that
+"j.doe@example.com" has a <a data-link-type="dfn" href="#user-account" id="ref-for-user-account④④">user account</a> at this <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④③">Relying Party</a>.</p>
+   <p>The following is a non-normative, non-exhaustive list of measures the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④④">Relying Party</a> may implement to mitigate or prevent information
 leakage due to such an attack:</p>
    <ul>
     <li data-md>
      <p>For <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②②">registration ceremonies</a>:</p>
      <ul>
       <li data-md>
-       <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④③">Relying Party</a> uses <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④④">Relying Party</a>-specific usernames to identify users:</p>
+       <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④⑤">Relying Party</a> uses <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④⑥">Relying Party</a>-specific usernames to identify users:</p>
        <ul>
         <li data-md>
          <p>When initiating a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②③">registration ceremony</a>, disallow registration of usernames that are syntactically valid e-mail
 addresses.</p>
-         <p class="note" role="note"><span class="marker">Note:</span> The motivation for this suggestion is that in this case the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④⑤">Relying Party</a> probably has no choice but to fail the <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②④">registration ceremony</a> if the user attempts to register a username that is already registered, and an information
+         <p class="note" role="note"><span class="marker">Note:</span> The motivation for this suggestion is that in this case the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④⑦">Relying Party</a> probably has no choice but to fail the <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②④">registration ceremony</a> if the user attempts to register a username that is already registered, and an information
 leak might therefore be unavoidable. By disallowing e-mail addresses as usernames, the impact of the leakage can be
-mitigated since it will be less likely that a user has the same username at this <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④⑥">Relying Party</a> as at other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④⑦">Relying Parties</a>.</p>
+mitigated since it will be less likely that a user has the same username at this <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④⑧">Relying Party</a> as at other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④⑨">Relying Parties</a>.</p>
        </ul>
       <li data-md>
-       <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④⑧">Relying Party</a> uses e-mail addresses to identify users:</p>
+       <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤⓪">Relying Party</a> uses e-mail addresses to identify users:</p>
        <ul>
         <li data-md>
          <p>When initiating a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②⑤">registration ceremony</a>, interrupt the user interaction after the e-mail address is supplied and
@@ -8938,7 +9063,7 @@ <h4 class="heading settled" data-level="14.6.2" id="sctn-username-enumeration"><
 ceremony by invoking <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get④⑤">navigator.credentials.get()</a></code> using a syntactically valid <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions①④">PublicKeyCredentialRequestOptions</a></code> object that is populated with plausible imaginary values.</p>
        <p>This approach could also be used to mitigate information leakage via <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials③②">allowCredentials</a></code>;
 see <a href="#sctn-unprotected-account-detection">§ 13.4.7 Unprotected account detection</a> and <a href="#sctn-credential-id-privacy-leak">§ 14.6.3 Privacy leak via credential IDs</a>.</p>
-       <p class="note" role="note"><span class="marker">Note:</span> The username may be "provided" in various <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④④⑨">Relying Party</a>-specific fashions: login form, session cookie, etc.</p>
+       <p class="note" role="note"><span class="marker">Note:</span> The username may be "provided" in various <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤①">Relying Party</a>-specific fashions: login form, session cookie, etc.</p>
        <p class="note" role="note"><span class="marker">Note:</span> If returned imaginary values noticeably differ from actual ones, clever attackers may be able to discern them and
     thus be able to test for existence of actual accounts. Examples of noticeably different values include if the values
     are always the same for all username inputs, or are different in repeated attempts with the same username input. The <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials③③">allowCredentials</a></code> member could therefore be populated with pseudo-random values
@@ -8955,17 +9080,17 @@ <h4 class="heading settled" data-level="14.6.2" id="sctn-username-enumeration"><
    </ul>
    <h4 class="heading settled" data-level="14.6.3" id="sctn-credential-id-privacy-leak"><span class="secno">14.6.3. </span><span class="content">Privacy leak via credential IDs</span><a class="self-link" href="#sctn-credential-id-privacy-leak"></a></h4>
    <p><em>This section is not normative.</em></p>
-   <p>This privacy consideration applies to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤⓪">Relying Parties</a> that support <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④⑦">authentication ceremonies</a> with a non-<a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty①③">empty</a> <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials③④">allowCredentials</a></code> argument as the first authentication step.
+   <p>This privacy consideration applies to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤②">Relying Parties</a> that support <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④⑦">authentication ceremonies</a> with a non-<a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty①③">empty</a> <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials③④">allowCredentials</a></code> argument as the first authentication step.
 For example, if using authentication with <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential①⑥">server-side credentials</a> as the first authentication step.</p>
    <p>In this case the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials③⑤">allowCredentials</a></code> argument risks leaking personally identifying information,
-since it exposes the user’s <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⑨">credential IDs</a> to an unauthenticated caller. <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id⑤⓪">Credential IDs</a> are designed to not be correlatable between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤①">Relying Parties</a>,
+since it exposes the user’s <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⑨">credential IDs</a> to an unauthenticated caller. <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id⑤⓪">Credential IDs</a> are designed to not be correlatable between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤③">Relying Parties</a>,
 but the length of a <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id⑤①">credential ID</a> might be a hint as to what type of <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③③⑤">authenticator</a> created it.
-It is likely that a user will use the same username and set of <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③③⑥">authenticators</a> for several <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤②">Relying Parties</a>,
+It is likely that a user will use the same username and set of <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③③⑥">authenticators</a> for several <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤④">Relying Parties</a>,
 so the number of <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id⑤②">credential IDs</a> in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials③⑥">allowCredentials</a></code> and their lengths
 might serve as a global correlation handle to de-anonymize the user.
 Knowing a user’s <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id⑤③">credential IDs</a> also makes it possible to confirm guesses about the user’s identity
 given only momentary physical access to one of the user’s <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③③⑦">authenticators</a>.</p>
-   <p>In order to prevent such information leakage, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤③">Relying Party</a> could for example:</p>
+   <p>In order to prevent such information leakage, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤⑤">Relying Party</a> could for example:</p>
    <ul>
     <li data-md>
      <p>Perform a separate authentication step,
@@ -8977,12 +9102,12 @@ <h4 class="heading settled" data-level="14.6.3" id="sctn-credential-id-privacy-l
    </ul>
    <p>If the above prevention measures are not available,
 i.e., if <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials③⑧">allowCredentials</a></code> needs to be exposed given only a username,
-the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤④">Relying Party</a> could mitigate the privacy leak using the same approach of returning imaginary <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id⑤⑤">credential IDs</a> as discussed in <a href="#sctn-username-enumeration">§ 14.6.2 Username Enumeration</a>.</p>
+the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤⑥">Relying Party</a> could mitigate the privacy leak using the same approach of returning imaginary <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id⑤⑤">credential IDs</a> as discussed in <a href="#sctn-username-enumeration">§ 14.6.2 Username Enumeration</a>.</p>
    <h2 class="heading settled" data-level="15" id="sctn-accessiblility-considerations"><span class="secno">15. </span><span class="content">Accessibility Considerations</span><a class="self-link" href="#sctn-accessiblility-considerations"></a></h2>
    <p><a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑥④">User verification</a>-capable <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator③③⑧">authenticators</a>, whether <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators②⑥">roaming</a> or <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators③⑥">platform</a>, should offer users more than one user verification method.  For example, both fingerprint sensing and PIN entry. This allows for fallback to other user verification means if the selected one is not working for some reason. Note that in the case of <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators②⑦">roaming authenticators</a>, the authenticator and platform might work together to provide a user verification method such as PIN entry <a data-link-type="biblio" href="#biblio-fido-ctap" title="Client to Authenticator Protocol (CTAP)">[FIDO-CTAP]</a>.</p>
-   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤⑤">Relying Parties</a>, at <a data-link-type="dfn" href="#registration" id="ref-for-registration②⑦">registration</a> time, SHOULD provide affordances for users to complete future <a data-link-type="dfn" href="#authorization-gesture" id="ref-for-authorization-gesture②⑨">authorization gestures</a> correctly. This could involve naming the authenticator, choosing a picture to associate with the device, or entering freeform text instructions (e.g., as a reminder-to-self).</p>
+   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤⑦">Relying Parties</a>, at <a data-link-type="dfn" href="#registration" id="ref-for-registration②⑦">registration</a> time, SHOULD provide affordances for users to complete future <a data-link-type="dfn" href="#authorization-gesture" id="ref-for-authorization-gesture②⑨">authorization gestures</a> correctly. This could involve naming the authenticator, choosing a picture to associate with the device, or entering freeform text instructions (e.g., as a reminder-to-self).</p>
    <h3 class="heading settled" data-level="15.1" id="sctn-timeout-recommended-range"><span class="secno">15.1. </span><span class="content">Recommended Range for Ceremony Timeouts</span><a class="self-link" href="#sctn-timeout-recommended-range"></a></h3>
-   <p><a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①⑧">Ceremonies</a> relying on timing, e.g., a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②⑥">registration ceremony</a> (see <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout④">timeout</a></code>) or an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④⑨">authentication ceremony</a> (see <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout④">timeout</a></code>), ought to follow <a data-link-type="biblio" href="#biblio-wcag21" title="Web Content Accessibility Guidelines (WCAG) 2.1">[WCAG21]</a>'s <a href="https://www.w3.org/TR/WCAG21/#enough-time">Guideline 2.2 Enough Time</a>. If a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤⑥">client platform</a> determines that a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤⑥">Relying Party</a>-supplied timeout does not appropriately adhere to the latter <a data-link-type="biblio" href="#biblio-wcag21" title="Web Content Accessibility Guidelines (WCAG) 2.1">[WCAG21]</a> guidelines, then the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤⑦">client platform</a> MAY adjust the timeout accordingly.</p>
+   <p><a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①⑧">Ceremonies</a> relying on timing, e.g., a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②⑥">registration ceremony</a> (see <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout④">timeout</a></code>) or an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④⑨">authentication ceremony</a> (see <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout④">timeout</a></code>), ought to follow <a data-link-type="biblio" href="#biblio-wcag21" title="Web Content Accessibility Guidelines (WCAG) 2.1">[WCAG21]</a>'s <a href="https://www.w3.org/TR/WCAG21/#enough-time">Guideline 2.2 Enough Time</a>. If a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤⑥">client platform</a> determines that a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party④⑤⑧">Relying Party</a>-supplied timeout does not appropriately adhere to the latter <a data-link-type="biblio" href="#biblio-wcag21" title="Web Content Accessibility Guidelines (WCAG) 2.1">[WCAG21]</a> guidelines, then the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤⑦">client platform</a> MAY adjust the timeout accordingly.</p>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="recommended-range-and-default-for-a-webauthn-ceremony-timeout">recommended range and default for a WebAuthn ceremony timeout</dfn> is as follows:</p>
    <ul>
     <li data-md>
@@ -9517,10 +9642,14 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     </ul>
    <li><a href="#dom-authenticationextensionslargeblobinputs-read">read</a><span>, in § 10.1.5</span>
    <li><a href="#recommended-range-and-default-for-a-webauthn-ceremony-timeout">recommended range and default for a WebAuthn ceremony timeout</a><span>, in § 15.1</span>
+   <li><a href="#registrable-origin-label">Registrable Origin Label</a><span>, in § 4</span>
    <li><a href="#registration">Registration</a><span>, in § 4</span>
    <li><a href="#registration-ceremony">Registration Ceremony</a><span>, in § 4</span>
    <li><a href="#registration-extension">registration extension</a><span>, in § 9</span>
    <li><a href="#dictdef-registrationresponsejson">RegistrationResponseJSON</a><span>, in § 5.1</span>
+   <li><a href="#dom-clientcapability-relatedorigins">"relatedOrigins"</a><span>, in § 5.8.7</span>
+   <li><a href="#dom-clientcapability-relatedorigins">relatedOrigins</a><span>, in § 5.8.7</span>
+   <li><a href="#abstract-opdef-related-origins-validation-procedure">related origins validation procedure</a><span>, in § 5.11.1</span>
    <li><a href="#relying-party">Relying Party</a><span>, in § 4</span>
    <li><a href="#relying-party-identifier">Relying Party Identifier</a><span>, in § 4</span>
    <li><a href="#remove-all-credentials">Remove All Credentials</a><span>, in § 11.8</span>
@@ -9843,6 +9972,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span cla
      <li><span class="dfn-paneled" id="a41102eb">permissions policy</span>
      <li><span class="dfn-paneled" id="e99bd18e">relevant global object</span>
      <li><span class="dfn-paneled" id="9c4c1e66">relevant settings object</span>
+     <li><span class="dfn-paneled" id="7393da89">same origin</span>
      <li><span class="dfn-paneled" id="feac4ab3">same site</span>
      <li><span class="dfn-paneled" id="a23d12a9">scheme</span>
      <li><span class="dfn-paneled" id="65181da8">secure context</span>
@@ -9862,6 +9992,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span cla
      <li><span class="dfn-paneled" id="a3b18719">append <small>(for set)</small></span>
      <li><span class="dfn-paneled" id="36858240">boolean</span>
      <li><span class="dfn-paneled" id="3de9e659">byte sequence</span>
+     <li><span class="dfn-paneled" id="ae8def21">contain</span>
      <li><span class="dfn-paneled" id="f937b7b6">continue</span>
      <li><span class="dfn-paneled" id="03afaf9c">empty</span>
      <li><span class="dfn-paneled" id="8958b003">entry</span>
@@ -9964,13 +10095,17 @@ <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span cla
     <a data-link-type="biblio">[URL]</a> defines the following terms:
     <ul>
      <li><span class="dfn-paneled" id="22477314">domain</span>
+     <li><span class="dfn-paneled" id="eea18c0d">domain label</span>
      <li><span class="dfn-paneled" id="cfc67fdc">empty host</span>
      <li><span class="dfn-paneled" id="b85ee3be">host</span>
      <li><span class="dfn-paneled" id="dbde7f99">ipv4 address</span>
      <li><span class="dfn-paneled" id="d6e2b0d9">ipv6 address</span>
      <li><span class="dfn-paneled" id="a1c25825">opaque host</span>
      <li><span class="dfn-paneled" id="bb3da43a">port</span>
+     <li><span class="dfn-paneled" id="bd6b32a4">public suffix</span>
+     <li><span class="dfn-paneled" id="bc9d7803">registrable domain</span>
      <li><span class="dfn-paneled" id="118b92bb">scheme</span>
+     <li><span class="dfn-paneled" id="ca3ca4ae">url parser</span>
      <li><span class="dfn-paneled" id="79cad4dd">valid domain</span>
      <li><span class="dfn-paneled" id="8de17130">valid domain string</span>
     </ul>
@@ -10019,7 +10154,6 @@ <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span cla
      <li><span class="dfn-paneled" id="4197ac46">interface object</span>
      <li><span class="dfn-paneled" id="7b052415">json type</span>
      <li><span class="dfn-paneled" id="f8de33a3">long</span>
-     <li><span class="dfn-paneled" id="9aeb0a82">long long</span>
      <li><span class="dfn-paneled" id="efd1ec5d">object</span>
      <li><span class="dfn-paneled" id="7787d359">record</span>
      <li><span class="dfn-paneled" id="9cce47fd">sequence</span>
@@ -10104,6 +10238,8 @@ <h3 class="no-num no-ref heading settled" id="normative"><span class="content">N
    <dd>P. Saint-Andre. <a href="https://www.rfc-editor.org/rfc/rfc8266"><cite>Preparation, Enforcement, and Comparison of Internationalized Strings Representing Nicknames</cite></a>. October 2017. Proposed Standard. URL: <a href="https://www.rfc-editor.org/rfc/rfc8266">https://www.rfc-editor.org/rfc/rfc8266</a>
    <dt id="biblio-rfc8610">[RFC8610]
    <dd>H. Birkholz; C. Vigano; C. Bormann. <a href="https://tools.ietf.org/html/rfc8610"><cite>Concise Data Definition Language (CDDL): A Notational Convention to Express Concise Binary Object Representation (CBOR) and JSON Data Structures</cite></a>. June 2019. IETF Proposed Standard. URL: <a href="https://tools.ietf.org/html/rfc8610">https://tools.ietf.org/html/rfc8610</a>
+   <dt id="biblio-rfc8615">[RFC8615]
+   <dd>M. Nottingham. <a href="https://www.rfc-editor.org/rfc/rfc8615"><cite>Well-Known Uniform Resource Identifiers (URIs)</cite></a>. May 2019. Proposed Standard. URL: <a href="https://www.rfc-editor.org/rfc/rfc8615">https://www.rfc-editor.org/rfc/rfc8615</a>
    <dt id="biblio-rfc8809">[RFC8809]
    <dd>Jeff Hodges; Giridhar Mandyam; Michael B. Jones. <a href="https://www.rfc-editor.org/rfc/rfc8809"><cite>Registries for Web Authentication (WebAuthn)</cite></a>. August 2020. IETF Proposed Standard. URL: <a href="https://www.rfc-editor.org/rfc/rfc8809">https://www.rfc-editor.org/rfc/rfc8809</a>
    <dt id="biblio-rfc8949">[RFC8949]
@@ -10212,7 +10348,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
     // algorithm then the public key must be parsed directly from
     // attestationObject or authenticatorData.
     <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a> <a data-type="Base64URLString" href="#dom-authenticatorattestationresponsejson-publickey"><code><c- g>publicKey</c-></code></a>;
-    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-long-long"><c- b>long</c-> <c- b>long</c-></a> <a data-type="long long" href="#dom-authenticatorattestationresponsejson-publickeyalgorithm"><code><c- g>publicKeyAlgorithm</c-></code></a>;
+    <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-cosealgorithmidentifier"><c- n>COSEAlgorithmIdentifier</c-></a> <a data-type="COSEAlgorithmIdentifier" href="#dom-authenticatorattestationresponsejson-publickeyalgorithm"><code><c- g>publicKeyAlgorithm</c-></code></a>;
     // This value contains copies of some of the fields above. See
     // section “Easily accessing credential data”.
     <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a> <a data-type="Base64URLString" href="#dom-authenticatorattestationresponsejson-attestationobject"><code><c- g>attestationObject</c-></code></a>;
@@ -10446,6 +10582,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
     <a class="idl-code" data-link-type="enum-value" href="#dom-clientcapability-hybridtransport"><c- s>"hybridTransport"</c-></a>,
     <a class="idl-code" data-link-type="enum-value" href="#dom-clientcapability-passkeyplatformauthenticator"><c- s>"passkeyPlatformAuthenticator"</c-></a>,
     <a class="idl-code" data-link-type="enum-value" href="#dom-clientcapability-userverifyingplatformauthenticator"><c- s>"userVerifyingPlatformAuthenticator"</c-></a>,
+    <a class="idl-code" data-link-type="enum-value" href="#dom-clientcapability-relatedorigins"><c- s>"relatedOrigins"</c-></a>
 };
 
 <c- b>enum</c-> <a class="idl-code" data-link-type="enum" href="#enumdef-publickeycredentialhints"><c- g>PublicKeyCredentialHints</c-></a> {
@@ -11023,7 +11160,7 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
 let dfnPanelData = {
 "010885a2": {"dfnID":"010885a2","dfnText":"crv","external":true,"refSections":[{"refs":[{"id":"ref-for-name-double-coordinate-curves"},{"id":"ref-for-name-double-coordinate-curves\u2460"}],"title":"5.2.1.1. Easily accessing credential data"},{"refs":[{"id":"ref-for-name-double-coordinate-curves\u2461"},{"id":"ref-for-name-double-coordinate-curves\u2462"},{"id":"ref-for-name-double-coordinate-curves\u2463"},{"id":"ref-for-name-double-coordinate-curves\u2464"}],"title":"5.8.5. Cryptographic Algorithm Identifier (typedef COSEAlgorithmIdentifier)"}],"url":"https://tools.ietf.org/html/rfc9053#name-double-coordinate-curves"},
 "0204d130": {"dfnID":"0204d130","dfnText":"%arraybuffer%","external":true,"refSections":[{"refs":[{"id":"ref-for-sec-arraybuffer-constructor"}],"title":"3. Dependencies"},{"refs":[{"id":"ref-for-sec-arraybuffer-constructor\u2460"},{"id":"ref-for-sec-arraybuffer-constructor\u2461"},{"id":"ref-for-sec-arraybuffer-constructor\u2462"}],"title":"5.1.3. Create a New Credential - PublicKeyCredential\u2019s [[Create]](origin, options, sameOriginWithAncestors) Method"},{"refs":[{"id":"ref-for-sec-arraybuffer-constructor\u2463"},{"id":"ref-for-sec-arraybuffer-constructor\u2464"},{"id":"ref-for-sec-arraybuffer-constructor\u2465"},{"id":"ref-for-sec-arraybuffer-constructor\u2466"},{"id":"ref-for-sec-arraybuffer-constructor\u2467"},{"id":"ref-for-sec-arraybuffer-constructor\u2468"}],"title":"5.1.4.1. PublicKeyCredential\u2019s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method"}],"url":"https://tc39.github.io/ecma262/#sec-arraybuffer-constructor"},
-"0204d188": {"dfnID":"0204d188","dfnText":"size","external":true,"refSections":[{"refs":[{"id":"ref-for-list-size"}],"title":"5.1.3. Create a New Credential - PublicKeyCredential\u2019s [[Create]](origin, options, sameOriginWithAncestors) Method"},{"refs":[{"id":"ref-for-list-size\u2460"},{"id":"ref-for-list-size\u2461"}],"title":"10.2.1.3.1. Registration (create())"},{"refs":[{"id":"ref-for-list-size\u2462"},{"id":"ref-for-list-size\u2463"},{"id":"ref-for-list-size\u2464"},{"id":"ref-for-list-size\u2465"}],"title":"10.2.1.3.2. Authentication (get())"}],"url":"https://infra.spec.whatwg.org/#list-size"},
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Availability of client capabilities - PublicKeyCredential\u2019s getClientCapabilities() Method"},{"refs":[{"id":"ref-for-relying-party\u2460\u2460\u2460"}],"title":"5.2. Authenticator Responses (interface AuthenticatorResponse)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2460\u2461"},{"id":"ref-for-relying-party\u2460\u2460\u2462"}],"title":"5.2.1. Information About Public Key Credential (interface AuthenticatorAttestationResponse)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2460\u2463"},{"id":"ref-for-relying-party\u2460\u2460\u2464"},{"id":"ref-for-relying-party\u2460\u2460\u2465"},{"id":"ref-for-relying-party\u2460\u2460\u2466"},{"id":"ref-for-relying-party\u2460\u2460\u2467"},{"id":"ref-for-relying-party\u2460\u2460\u2468"},{"id":"ref-for-relying-party\u2460\u2461\u24ea"}],"title":"5.2.1.1. Easily accessing credential data"},{"refs":[{"id":"ref-for-relying-party\u2460\u2461\u2460"},{"id":"ref-for-relying-party\u2460\u2461\u2461"},{"id":"ref-for-relying-party\u2460\u2461\u2462"},{"id":"ref-for-relying-party\u2460\u2461\u2463"},{"id":"ref-for-relying-party\u2460\u2461\u2464"},{"id":"ref-for-relying-party\u2460\u2461\u2465"},{"id":"ref-for-relying-party\u2460\u2461\u2466"},{"id":"ref-for-relying-party\u2460\u2461\u2467"},{"id":"ref-for-relying-party\u2460\u2461\u2468"},{"id":"ref-for-relying-party\u2460\u2462\u24ea"},{"id":"ref-for-relying-party\u2460\u2462\u2460"}],"title":"5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2462\u2461"},{"id":"ref-for-relying-party\u2460\u2462\u2462"},{"id":"ref-for-relying-party\u2460\u2462\u2463"},{"id":"ref-for-relying-party\u2460\u2462\u2464"},{"id":"ref-for-relying-party\u2460\u2462\u2465"},{"id":"ref-for-relying-party\u2460\u2462\u2466"}],"title":"5.4.1. Public Key Entity Description (dictionary PublicKeyCredentialEntity)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2462\u2467"},{"id":"ref-for-relying-party\u2460\u2462\u2468"}],"title":"5.4.2. Relying Party Parameters for Credential Generation (dictionary PublicKeyCredentialRpEntity)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2463\u24ea"},{"id":"ref-for-relying-party\u2460\u2463\u2460"},{"id":"ref-for-relying-party\u2460\u2463\u2461"},{"id":"ref-for-relying-party\u2460\u2463\u2462"},{"id":"ref-for-relying-party\u2460\u2463\u2463"}],"title":"5.4.3. User Account Parameters for Credential Generation (dictionary PublicKeyCredentialUserEntity)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2463\u2464"},{"id":"ref-for-relying-party\u2460\u2463\u2465"},{"id":"ref-for-relying-party\u2460\u2463\u2466"}],"title":"5.4.4. Authenticator Selection Criteria (dictionary AuthenticatorSelectionCriteria)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2463\u2467"},{"id":"ref-for-relying-party\u2460\u2463\u2468"},{"id":"ref-for-relying-party\u2460\u2464\u24ea"}],"title":"5.4.5. Authenticator Attachment Enumeration (enum AuthenticatorAttachment)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2464\u2460"},{"id":"ref-for-relying-party\u2460\u2464\u2461"},{"id":"ref-for-relying-party\u2460\u2464\u2462"},{"id":"ref-for-relying-party\u2460\u2464\u2463"},{"id":"ref-for-relying-party\u2460\u2464\u2464"},{"id":"ref-for-relying-party\u2460\u2464\u2465"}],"title":"5.4.6. Resident Key Requirement Enumeration (enum ResidentKeyRequirement)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2464\u2466"},{"id":"ref-for-relying-party\u2460\u2464\u2467"},{"id":"ref-for-relying-party\u2460\u2464\u2468"},{"id":"ref-for-relying-party\u2460\u2465\u24ea"},{"id":"ref-for-relying-party\u2460\u2465\u2460"},{"id":"ref-for-relying-party\u2460\u2465\u2461"},{"id":"ref-for-relying-party\u2460\u2465\u2462"},{"id":"ref-for-relying-party\u2460\u2465\u2463"}],"title":"5.4.7. Attestation Conveyance Preference Enumeration (enum AttestationConveyancePreference)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2465\u2464"},{"id":"ref-for-relying-party\u2460\u2465\u2465"},{"id":"ref-for-relying-party\u2460\u2465\u2466"},{"id":"ref-for-relying-party\u2460\u2465\u2467"},{"id":"ref-for-relying-party\u2460\u2465\u2468"},{"id":"ref-for-relying-party\u2460\u2466\u24ea"},{"id":"ref-for-relying-party\u2460\u2466\u2460"},{"id":"ref-for-relying-party\u2460\u2466\u2461"},{"id":"ref-for-relying-party\u2460\u2466\u2462"}],"title":"5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2466\u2463"}],"title":"5.7.3. Authentication Extensions Authenticator Inputs (CDDL type AuthenticationExtensionsAuthenticatorInputs)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2466\u2464"},{"id":"ref-for-relying-party\u2460\u2466\u2465"},{"id":"ref-for-relying-party\u2460\u2466\u2466"},{"id":"ref-for-relying-party\u2460\u2466\u2467"},{"id":"ref-for-relying-party\u2460\u2466\u2468"}],"title":"5.8.1. Client Data Used in WebAuthn Signatures (dictionary CollectedClientData)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2467\u24ea"}],"title":"5.8.4. Authenticator Transport Enumeration (enum AuthenticatorTransport)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2467\u2460"},{"id":"ref-for-relying-party\u2460\u2467\u2461"},{"id":"ref-for-relying-party\u2460\u2467\u2462"}],"title":"5.8.6. User Verification Requirement Enumeration (enum UserVerificationRequirement)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2467\u2463"},{"id":"ref-for-relying-party\u2460\u2467\u2464"},{"id":"ref-for-relying-party\u2460\u2467\u2465"},{"id":"ref-for-relying-party\u2460\u2467\u2466"},{"id":"ref-for-relying-party\u2460\u2467\u2467"},{"id":"ref-for-relying-party\u2460\u2467\u2468"},{"id":"ref-for-relying-party\u2460\u2468\u24ea"}],"title":"5.8.8. User-agent Hints Enumeration (enum PublicKeyCredentialHints)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2468\u2460"}],"title":"5.10. Using Web Authentication within iframe elements"},{"refs":[{"id":"ref-for-relying-party\u2460\u2468\u2461"},{"id":"ref-for-relying-party\u2460\u2468\u2462"},{"id":"ref-for-relying-party\u2460\u2468\u2463"},{"id":"ref-for-relying-party\u2460\u2468\u2464"},{"id":"ref-for-relying-party\u2460\u2468\u2465"}],"title":"6. WebAuthn Authenticator Model"},{"refs":[{"id":"ref-for-relying-party\u2460\u2468\u2466"}],"title":"6.1. Authenticator Data"},{"refs":[{"id":"ref-for-relying-party\u2460\u2468\u2467"},{"id":"ref-for-relying-party\u2460\u2468\u2468"},{"id":"ref-for-relying-party\u2461\u24ea\u24ea"},{"id":"ref-for-relying-party\u2461\u24ea\u2460"},{"id":"ref-for-relying-party\u2461\u24ea\u2461"}],"title":"6.1.1. Signature Counter Considerations"},{"refs":[{"id":"ref-for-relying-party\u2461\u24ea\u2462"},{"id":"ref-for-relying-party\u2461\u24ea\u2463"},{"id":"ref-for-relying-party\u2461\u24ea\u2464"},{"id":"ref-for-relying-party\u2461\u24ea\u2465"},{"id":"ref-for-relying-party\u2461\u24ea\u2466"}],"title":"6.1.3. Credential Backup State"},{"refs":[{"id":"ref-for-relying-party\u2461\u24ea\u2467"}],"title":"6.2. Authenticator Taxonomy"},{"refs":[{"id":"ref-for-relying-party\u2461\u24ea\u2468"},{"id":"ref-for-relying-party\u2461\u2460\u24ea"},{"id":"ref-for-relying-party\u2461\u2460\u2460"}],"title":"6.2.2. Credential Storage Modality"},{"refs":[{"id":"ref-for-relying-party\u2461\u2460\u2461"},{"id":"ref-for-relying-party\u2461\u2460\u2462"},{"id":"ref-for-relying-party\u2461\u2460\u2463"}],"title":"6.2.3. Authentication Factor Capability"},{"refs":[{"id":"ref-for-relying-party\u2461\u2460\u2464"},{"id":"ref-for-relying-party\u2461\u2460\u2465"},{"id":"ref-for-relying-party\u2461\u2460\u2466"},{"id":"ref-for-relying-party\u2461\u2460\u2467"},{"id":"ref-for-relying-party\u2461\u2460\u2468"},{"id":"ref-for-relying-party\u2461\u2461\u24ea"},{"id":"ref-for-relying-party\u2461\u2461\u2460"}],"title":"6.3.2. The authenticatorMakeCredential Operation"},{"refs":[{"id":"ref-for-relying-party\u2461\u2461\u2461"},{"id":"ref-for-relying-party\u2461\u2461\u2462"},{"id":"ref-for-relying-party\u2461\u2461\u2463"}],"title":"6.3.3. The authenticatorGetAssertion Operation"},{"refs":[{"id":"ref-for-relying-party\u2461\u2461\u2464"}],"title":"6.4. String Handling"},{"refs":[{"id":"ref-for-relying-party\u2461\u2461\u2465"}],"title":"6.4.1.1. String Truncation by Clients"},{"refs":[{"id":"ref-for-relying-party\u2461\u2461\u2466"},{"id":"ref-for-relying-party\u2461\u2461\u2467"},{"id":"ref-for-relying-party\u2461\u2461\u2468"},{"id":"ref-for-relying-party\u2461\u2462\u24ea"},{"id":"ref-for-relying-party\u2461\u2462\u2460"},{"id":"ref-for-relying-party\u2461\u2462\u2461"},{"id":"ref-for-relying-party\u2461\u2462\u2462"},{"id":"ref-for-relying-party\u2461\u2462\u2463"}],"title":"6.5. Attestation"},{"refs":[{"id":"ref-for-relying-party\u2461\u2462\u2464"},{"id":"ref-for-relying-party\u2461\u2462\u2465"},{"id":"ref-for-relying-party\u2461\u2462\u2466"},{"id":"ref-for-relying-party\u2461\u2462\u2467"},{"id":"ref-for-relying-party\u2461\u2462\u2468"}],"title":"6.5.3. Attestation Types"},{"refs":[{"id":"ref-for-relying-party\u2461\u2463\u24ea"},{"id":"ref-for-relying-party\u2461\u2463\u2460"},{"id":"ref-for-relying-party\u2461\u2463\u2461"},{"id":"ref-for-relying-party\u2461\u2463\u2462"}],"title":"7. WebAuthn Relying Party Operations"},{"refs":[{"id":"ref-for-relying-party\u2461\u2463\u2463"},{"id":"ref-for-relying-party\u2461\u2463\u2464"},{"id":"ref-for-relying-party\u2461\u2463\u2465"},{"id":"ref-for-relying-party\u2461\u2463\u2466"},{"id":"ref-for-relying-party\u2461\u2463\u2467"},{"id":"ref-for-relying-party\u2461\u2463\u2468"},{"id":"ref-for-relying-party\u2461\u2464\u24ea"},{"id":"ref-for-relying-party\u2461\u2464\u2460"},{"id":"ref-for-relying-party\u2461\u2464\u2461"},{"id":"ref-for-relying-party\u2461\u2464\u2462"},{"id":"ref-for-relying-party\u2461\u2464\u2463"},{"id":"ref-for-relying-party\u2461\u2464\u2464"},{"id":"ref-for-relying-party\u2461\u2464\u2465"},{"id":"ref-for-relying-party\u2461\u2464\u2466"},{"id":"ref-for-relying-party\u2461\u2464\u2467"},{"id":"ref-for-relying-party\u2461\u2464\u2468"},{"id":"ref-for-relying-party\u2461\u2465\u24ea"},{"id":"ref-for-relying-party\u2461\u2465\u2460"},{"id":"ref-for-relying-party\u2461\u2465\u2461"},{"id":"ref-for-relying-party\u2461\u2465\u2462"},{"id":"ref-for-relying-party\u2461\u2465\u2463"},{"id":"ref-for-relying-party\u2461\u2465\u2464"},{"id":"ref-for-relying-party\u2461\u2465\u2465"},{"id":"ref-for-relying-party\u2461\u2465\u2466"},{"id":"ref-for-relying-party\u2461\u2465\u2467"},{"id":"ref-for-relying-party\u2461\u2465\u2468"}],"title":"7.1. Registering a New Credential"},{"refs":[{"id":"ref-for-relying-party\u2461\u2466\u24ea"},{"id":"ref-for-relying-party\u2461\u2466\u2460"},{"id":"ref-for-relying-party\u2461\u2466\u2461"},{"id":"ref-for-relying-party\u2461\u2466\u2462"},{"id":"ref-for-relying-party\u2461\u2466\u2463"},{"id":"ref-for-relying-party\u2461\u2466\u2464"},{"id":"ref-for-relying-party\u2461\u2466\u2465"},{"id":"ref-for-relying-party\u2461\u2466\u2466"},{"id":"ref-for-relying-party\u2461\u2466\u2467"},{"id":"ref-for-relying-party\u2461\u2466\u2468"},{"id":"ref-for-relying-party\u2461\u2467\u24ea"},{"id":"ref-for-relying-party\u2461\u2467\u2460"},{"id":"ref-for-relying-party\u2461\u2467\u2461"},{"id":"ref-for-relying-party\u2461\u2467\u2462"},{"id":"ref-for-relying-party\u2461\u2467\u2463"},{"id":"ref-for-relying-party\u2461\u2467\u2464"},{"id":"ref-for-relying-party\u2461\u2467\u2465"},{"id":"ref-for-relying-party\u2461\u2467\u2466"}],"title":"7.2. Verifying an Authentication Assertion"},{"refs":[{"id":"ref-for-relying-party\u2461\u2467\u2467"},{"id":"ref-for-relying-party\u2461\u2467\u2468"}],"title":"8.2.1. Packed Attestation Statement Certificate Requirements"},{"refs":[{"id":"ref-for-relying-party\u2461\u2468\u24ea"},{"id":"ref-for-relying-party\u2461\u2468\u2460"}],"title":"8.9. Compound Attestation Statement Format"},{"refs":[{"id":"ref-for-relying-party\u2461\u2468\u2461"},{"id":"ref-for-relying-party\u2461\u2468\u2462"},{"id":"ref-for-relying-party\u2461\u2468\u2463"}],"title":"9. WebAuthn Extensions"},{"refs":[{"id":"ref-for-relying-party\u2461\u2468\u2464"}],"title":"9.2. Defining Extensions"},{"refs":[{"id":"ref-for-relying-party\u2461\u2468\u2465"},{"id":"ref-for-relying-party\u2461\u2468\u2466"},{"id":"ref-for-relying-party\u2461\u2468\u2467"}],"title":"9.3. Extending Request Parameters"},{"refs":[{"id":"ref-for-relying-party\u2461\u2468\u2468"}],"title":"9.5. Authenticator Extension Processing"},{"refs":[{"id":"ref-for-relying-party\u2462\u24ea\u24ea"},{"id":"ref-for-relying-party\u2462\u24ea\u2460"},{"id":"ref-for-relying-party\u2462\u24ea\u2461"},{"id":"ref-for-relying-party\u2462\u24ea\u2462"},{"id":"ref-for-relying-party\u2462\u24ea\u2463"}],"title":"10.1.1. FIDO AppID Extension (appid)"},{"refs":[{"id":"ref-for-relying-party\u2462\u24ea\u2464"},{"id":"ref-for-relying-party\u2462\u24ea\u2465"}],"title":"10.1.2. FIDO AppID Exclusion Extension (appidExclude)"},{"refs":[{"id":"ref-for-relying-party\u2462\u24ea\u2466"},{"id":"ref-for-relying-party\u2462\u24ea\u2467"},{"id":"ref-for-relying-party\u2462\u24ea\u2468"},{"id":"ref-for-relying-party\u2462\u2460\u24ea"},{"id":"ref-for-relying-party\u2462\u2460\u2460"},{"id":"ref-for-relying-party\u2462\u2460\u2461"}],"title":"10.1.3. Credential Properties Extension (credProps)"},{"refs":[{"id":"ref-for-relying-party\u2462\u2460\u2462"},{"id":"ref-for-relying-party\u2462\u2460\u2463"},{"id":"ref-for-relying-party\u2462\u2460\u2464"}],"title":"10.1.4. Pseudo-random function extension (prf)"},{"refs":[{"id":"ref-for-relying-party\u2462\u2460\u2465"},{"id":"ref-for-relying-party\u2462\u2460\u2466"},{"id":"ref-for-relying-party\u2462\u2460\u2467"},{"id":"ref-for-relying-party\u2462\u2460\u2468"},{"id":"ref-for-relying-party\u2462\u2461\u24ea"},{"id":"ref-for-relying-party\u2462\u2461\u2460"},{"id":"ref-for-relying-party\u2462\u2461\u2461"},{"id":"ref-for-relying-party\u2462\u2461\u2462"}],"title":"10.1.5. Large blob storage extension (largeBlob)"},{"refs":[{"id":"ref-for-relying-party\u2462\u2461\u2463"},{"id":"ref-for-relying-party\u2462\u2461\u2464"}],"title":"10.2.1. Supplemental public keys extension (supplementalPubKeys)"},{"refs":[{"id":"ref-for-relying-party\u2462\u2461\u2465"},{"id":"ref-for-relying-party\u2462\u2461\u2466"},{"id":"ref-for-relying-party\u2462\u2461\u2467"},{"id":"ref-for-relying-party\u2462\u2461\u2468"}],"title":"10.2.1.1. Relying Party Usage"},{"refs":[{"id":"ref-for-relying-party\u2462\u2462\u24ea"},{"id":"ref-for-relying-party\u2462\u2462\u2460"},{"id":"ref-for-relying-party\u2462\u2462\u2461"},{"id":"ref-for-relying-party\u2462\u2462\u2462"},{"id":"ref-for-relying-party\u2462\u2462\u2463"},{"id":"ref-for-relying-party\u2462\u2462\u2464"},{"id":"ref-for-relying-party\u2462\u2462\u2465"}],"title":"10.2.1.2. Extension Definition"},{"refs":[{"id":"ref-for-relying-party\u2462\u2462\u2466"}],"title":"10.2.1.2.1. AAGUIDs"},{"refs":[{"id":"ref-for-relying-party\u2462\u2462\u2467"}],"title":"10.2.1.2.2. Attestation calculations"},{"refs":[{"id":"ref-for-relying-party\u2462\u2462\u2468"}],"title":"10.2.1.3. supplementalPubKeys Extension Output Verification Procedures"},{"refs":[{"id":"ref-for-relying-party\u2462\u2463\u24ea"},{"id":"ref-for-relying-party\u2462\u2463\u2460"},{"id":"ref-for-relying-party\u2462\u2463\u2461"},{"id":"ref-for-relying-party\u2462\u2463\u2462"}],"title":"10.2.1.3.1. Registration (create())"},{"refs":[{"id":"ref-for-relying-party\u2462\u2463\u2463"},{"id":"ref-for-relying-party\u2462\u2463\u2464"},{"id":"ref-for-relying-party\u2462\u2463\u2465"},{"id":"ref-for-relying-party\u2462\u2463\u2466"},{"id":"ref-for-relying-party\u2462\u2463\u2467"},{"id":"ref-for-relying-party\u2462\u2463\u2468"},{"id":"ref-for-relying-party\u2462\u2464\u24ea"}],"title":"10.2.1.3.2. Authentication (get())"},{"refs":[{"id":"ref-for-relying-party\u2462\u2464\u2460"}],"title":"12.4. WebAuthn Extension Identifier Registrations"},{"refs":[{"id":"ref-for-relying-party\u2462\u2464\u2461"},{"id":"ref-for-relying-party\u2462\u2464\u2462"},{"id":"ref-for-relying-party\u2462\u2464\u2463"},{"id":"ref-for-relying-party\u2462\u2464\u2464"}],"title":"13. Security Considerations"},{"refs":[{"id":"ref-for-relying-party\u2462\u2464\u2465"},{"id":"ref-for-relying-party\u2462\u2464\u2466"}],"title":"13.2. Physical Proximity between Client and Authenticator"},{"refs":[{"id":"ref-for-relying-party\u2462\u2464\u2467"},{"id":"ref-for-relying-party\u2462\u2464\u2468"}],"title":"13.3.2. Attestation Certificate and Attestation Certificate CA Compromise"},{"refs":[{"id":"ref-for-relying-party\u2462\u2465\u24ea"}],"title":"13.4. Security considerations for Relying Parties"},{"refs":[{"id":"ref-for-relying-party\u2462\u2465\u2460"},{"id":"ref-for-relying-party\u2462\u2465\u2461"},{"id":"ref-for-relying-party\u2462\u2465\u2462"},{"id":"ref-for-relying-party\u2462\u2465\u2463"},{"id":"ref-for-relying-party\u2462\u2465\u2464"},{"id":"ref-for-relying-party\u2462\u2465\u2465"}],"title":"13.4.1. Security Benefits for WebAuthn Relying Parties"},{"refs":[{"id":"ref-for-relying-party\u2462\u2465\u2466"},{"id":"ref-for-relying-party\u2462\u2465\u2467"},{"id":"ref-for-relying-party\u2462\u2465\u2468"},{"id":"ref-for-relying-party\u2462\u2466\u24ea"}],"title":"13.4.2. Visibility Considerations for Embedded Usage"},{"refs":[{"id":"ref-for-relying-party\u2462\u2466\u2460"},{"id":"ref-for-relying-party\u2462\u2466\u2461"}],"title":"13.4.3. Cryptographic Challenges"},{"refs":[{"id":"ref-for-relying-party\u2462\u2466\u2462"},{"id":"ref-for-relying-party\u2462\u2466\u2463"},{"id":"ref-for-relying-party\u2462\u2466\u2464"},{"id":"ref-for-relying-party\u2462\u2466\u2465"},{"id":"ref-for-relying-party\u2462\u2466\u2466"},{"id":"ref-for-relying-party\u2462\u2466\u2467"},{"id":"ref-for-relying-party\u2462\u2466\u2468"},{"id":"ref-for-relying-party\u2462\u2467\u24ea"}],"title":"13.4.4. Attestation Limitations"},{"refs":[{"id":"ref-for-relying-party\u2462\u2467\u2460"},{"id":"ref-for-relying-party\u2462\u2467\u2461"},{"id":"ref-for-relying-party\u2462\u2467\u2462"}],"title":"13.4.5. Revoked Attestation Certificates"},{"refs":[{"id":"ref-for-relying-party\u2462\u2467\u2463"},{"id":"ref-for-relying-party\u2462\u2467\u2464"},{"id":"ref-for-relying-party\u2462\u2467\u2465"}],"title":"13.4.6. Credential Loss and Key Mobility"},{"refs":[{"id":"ref-for-relying-party\u2462\u2467\u2466"},{"id":"ref-for-relying-party\u2462\u2467\u2467"}],"title":"13.4.7. Unprotected account detection"},{"refs":[{"id":"ref-for-relying-party\u2462\u2467\u2468"},{"id":"ref-for-relying-party\u2462\u2468\u24ea"},{"id":"ref-for-relying-party\u2462\u2468\u2460"},{"id":"ref-for-relying-party\u2462\u2468\u2461"},{"id":"ref-for-relying-party\u2462\u2468\u2462"},{"id":"ref-for-relying-party\u2462\u2468\u2463"},{"id":"ref-for-relying-party\u2462\u2468\u2464"},{"id":"ref-for-relying-party\u2462\u2468\u2465"},{"id":"ref-for-relying-party\u2462\u2468\u2466"}],"title":"13.4.8. Code injection attacks"},{"refs":[{"id":"ref-for-relying-party\u2462\u2468\u2467"},{"id":"ref-for-relying-party\u2462\u2468\u2468"},{"id":"ref-for-relying-party\u2463\u24ea\u24ea"},{"id":"ref-for-relying-party\u2463\u24ea\u2460"},{"id":"ref-for-relying-party\u2463\u24ea\u2461"},{"id":"ref-for-relying-party\u2463\u24ea\u2462"},{"id":"ref-for-relying-party\u2463\u24ea\u2463"}],"title":"13.4.9. Validating the origin of a credential"},{"refs":[{"id":"ref-for-relying-party\u2463\u24ea\u2464"}],"title":"14. Privacy Considerations"},{"refs":[{"id":"ref-for-relying-party\u2463\u24ea\u2465"},{"id":"ref-for-relying-party\u2463\u24ea\u2466"},{"id":"ref-for-relying-party\u2463\u24ea\u2467"},{"id":"ref-for-relying-party\u2463\u24ea\u2468"},{"id":"ref-for-relying-party\u2463\u2460\u24ea"},{"id":"ref-for-relying-party\u2463\u2460\u2460"},{"id":"ref-for-relying-party\u2463\u2460\u2461"}],"title":"14.1. De-anonymization Prevention Measures"},{"refs":[{"id":"ref-for-relying-party\u2463\u2460\u2462"},{"id":"ref-for-relying-party\u2463\u2460\u2463"},{"id":"ref-for-relying-party\u2463\u2460\u2464"},{"id":"ref-for-relying-party\u2463\u2460\u2465"},{"id":"ref-for-relying-party\u2463\u2460\u2466"},{"id":"ref-for-relying-party\u2463\u2460\u2467"},{"id":"ref-for-relying-party\u2463\u2460\u2468"},{"id":"ref-for-relying-party\u2463\u2461\u24ea"},{"id":"ref-for-relying-party\u2463\u2461\u2460"},{"id":"ref-for-relying-party\u2463\u2461\u2461"},{"id":"ref-for-relying-party\u2463\u2461\u2462"}],"title":"14.2. Anonymous, Scoped, Non-correlatable Public Key Credentials"},{"refs":[{"id":"ref-for-relying-party\u2463\u2461\u2463"},{"id":"ref-for-relying-party\u2463\u2461\u2464"},{"id":"ref-for-relying-party\u2463\u2461\u2465"},{"id":"ref-for-relying-party\u2463\u2461\u2466"},{"id":"ref-for-relying-party\u2463\u2461\u2467"}],"title":"14.3. Authenticator-local Biometric Recognition"},{"refs":[{"id":"ref-for-relying-party\u2463\u2461\u2468"},{"id":"ref-for-relying-party\u2463\u2462\u24ea"},{"id":"ref-for-relying-party\u2463\u2462\u2460"}],"title":"14.5.1. Registration Ceremony Privacy"},{"refs":[{"id":"ref-for-relying-party\u2463\u2462\u2461"},{"id":"ref-for-relying-party\u2463\u2462\u2462"},{"id":"ref-for-relying-party\u2463\u2462\u2463"}],"title":"14.5.2. Authentication Ceremony Privacy"},{"refs":[{"id":"ref-for-relying-party\u2463\u2462\u2464"}],"title":"14.6. Privacy considerations for Relying Parties"},{"refs":[{"id":"ref-for-relying-party\u2463\u2462\u2465"},{"id":"ref-for-relying-party\u2463\u2462\u2466"}],"title":"14.6.1. User Handle Contents"},{"refs":[{"id":"ref-for-relying-party\u2463\u2462\u2467"},{"id":"ref-for-relying-party\u2463\u2462\u2468"},{"id":"ref-for-relying-party\u2463\u2463\u24ea"},{"id":"ref-for-relying-party\u2463\u2463\u2460"},{"id":"ref-for-relying-party\u2463\u2463\u2461"},{"id":"ref-for-relying-party\u2463\u2463\u2462"},{"id":"ref-for-relying-party\u2463\u2463\u2463"},{"id":"ref-for-relying-party\u2463\u2463\u2464"},{"id":"ref-for-relying-party\u2463\u2463\u2465"},{"id":"ref-for-relying-party\u2463\u2463\u2466"},{"id":"ref-for-relying-party\u2463\u2463\u2467"},{"id":"ref-for-relying-party\u2463\u2463\u2468"}],"title":"14.6.2. Username Enumeration"},{"refs":[{"id":"ref-for-relying-party\u2463\u2464\u24ea"},{"id":"ref-for-relying-party\u2463\u2464\u2460"},{"id":"ref-for-relying-party\u2463\u2464\u2461"},{"id":"ref-for-relying-party\u2463\u2464\u2462"},{"id":"ref-for-relying-party\u2463\u2464\u2463"}],"title":"14.6.3. Privacy leak via credential IDs"},{"refs":[{"id":"ref-for-relying-party\u2463\u2464\u2464"}],"title":"15. Accessibility Considerations"},{"refs":[{"id":"ref-for-relying-party\u2463\u2464\u2465"}],"title":"15.1. Recommended Range for Ceremony Timeouts"}],"url":"#relying-party"},
+"relying-party": {"dfnID":"relying-party","dfnText":"Relying Party","external":false,"refSections":[{"refs":[{"id":"ref-for-relying-party\u2460"},{"id":"ref-for-relying-party\u2461"},{"id":"ref-for-relying-party\u2462"},{"id":"ref-for-relying-party\u2463"},{"id":"ref-for-relying-party\u2464"},{"id":"ref-for-relying-party\u2465"},{"id":"ref-for-relying-party\u2466"}],"title":"1. Introduction"},{"refs":[{"id":"ref-for-relying-party\u2467"},{"id":"ref-for-relying-party\u2468"},{"id":"ref-for-relying-party\u2460\u24ea"},{"id":"ref-for-relying-party\u2460\u2460"},{"id":"ref-for-relying-party\u2460\u2461"},{"id":"ref-for-relying-party\u2460\u2462"},{"id":"ref-for-relying-party\u2460\u2463"},{"id":"ref-for-relying-party\u2460\u2464"}],"title":"1.1. Specification Roadmap"},{"refs":[{"id":"ref-for-relying-party\u2460\u2465"}],"title":"1.2.3. New Device Registration"},{"refs":[{"id":"ref-for-relying-party\u2460\u2466"}],"title":"1.2.4. Other Use Cases and Configurations"},{"refs":[{"id":"ref-for-relying-party\u2460\u2467"},{"id":"ref-for-relying-party\u2460\u2468"},{"id":"ref-for-relying-party\u2461\u24ea"},{"id":"ref-for-relying-party\u2461\u2460"}],"title":"1.3.1. Registration"},{"refs":[{"id":"ref-for-relying-party\u2461\u2461"},{"id":"ref-for-relying-party\u2461\u2462"},{"id":"ref-for-relying-party\u2461\u2463"}],"title":"1.3.2. Registration Specifically with User-Verifying Platform Authenticator"},{"refs":[{"id":"ref-for-relying-party\u2461\u2464"},{"id":"ref-for-relying-party\u2461\u2465"},{"id":"ref-for-relying-party\u2461\u2466"},{"id":"ref-for-relying-party\u2461\u2467"},{"id":"ref-for-relying-party\u2461\u2468"}],"title":"1.3.3. Authentication"},{"refs":[{"id":"ref-for-relying-party\u2462\u24ea"},{"id":"ref-for-relying-party\u2462\u2460"}],"title":"1.3.5. Decommissioning"},{"refs":[{"id":"ref-for-relying-party\u2462\u2461"}],"title":"2.1.1. Enumerations as DOMString types"},{"refs":[{"id":"ref-for-relying-party\u2462\u2462"},{"id":"ref-for-relying-party\u2462\u2463"},{"id":"ref-for-relying-party\u2462\u2464"},{"id":"ref-for-relying-party\u2462\u2465"},{"id":"ref-for-relying-party\u2462\u2466"},{"id":"ref-for-relying-party\u2462\u2467"},{"id":"ref-for-relying-party\u2462\u2468"},{"id":"ref-for-relying-party\u2463\u24ea"},{"id":"ref-for-relying-party\u2463\u2460"},{"id":"ref-for-relying-party\u2463\u2461"},{"id":"ref-for-relying-party\u2463\u2462"},{"id":"ref-for-relying-party\u2463\u2463"},{"id":"ref-for-relying-party\u2463\u2464"},{"id":"ref-for-relying-party\u2463\u2465"},{"id":"ref-for-relying-party\u2463\u2466"},{"id":"ref-for-relying-party\u2463\u2467"},{"id":"ref-for-relying-party\u2463\u2468"},{"id":"ref-for-relying-party\u2464\u24ea"},{"id":"ref-for-relying-party\u2464\u2460"},{"id":"ref-for-relying-party\u2464\u2461"},{"id":"ref-for-relying-party\u2464\u2462"},{"id":"ref-for-relying-party\u2464\u2463"},{"id":"ref-for-relying-party\u2464\u2464"},{"id":"ref-for-relying-party\u2464\u2465"},{"id":"ref-for-relying-party\u2464\u2466"},{"id":"ref-for-relying-party\u2464\u2467"},{"id":"ref-for-relying-party\u2464\u2468"},{"id":"ref-for-relying-party\u2465\u24ea"},{"id":"ref-for-relying-party\u2465\u2460"},{"id":"ref-for-relying-party\u2465\u2461"},{"id":"ref-for-relying-party\u2465\u2462"},{"id":"ref-for-relying-party\u2465\u2463"},{"id":"ref-for-relying-party\u2465\u2464"},{"id":"ref-for-relying-party\u2465\u2465"},{"id":"ref-for-relying-party\u2465\u2466"},{"id":"ref-for-relying-party\u2465\u2467"},{"id":"ref-for-relying-party\u2465\u2468"},{"id":"ref-for-relying-party\u2466\u24ea"},{"id":"ref-for-relying-party\u2466\u2460"},{"id":"ref-for-relying-party\u2466\u2461"},{"id":"ref-for-relying-party\u2466\u2462"},{"id":"ref-for-relying-party\u2466\u2463"},{"id":"ref-for-relying-party\u2466\u2464"},{"id":"ref-for-relying-party\u2466\u2465"},{"id":"ref-for-relying-party\u2466\u2466"},{"id":"ref-for-relying-party\u2466\u2467"},{"id":"ref-for-relying-party\u2466\u2468"},{"id":"ref-for-relying-party\u2467\u24ea"},{"id":"ref-for-relying-party\u2467\u2460"},{"id":"ref-for-relying-party\u2467\u2461"},{"id":"ref-for-relying-party\u2467\u2462"}],"title":"4. Terminology"},{"refs":[{"id":"ref-for-relying-party\u2467\u2463"},{"id":"ref-for-relying-party\u2467\u2464"},{"id":"ref-for-relying-party\u2467\u2465"},{"id":"ref-for-relying-party\u2467\u2466"},{"id":"ref-for-relying-party\u2467\u2467"},{"id":"ref-for-relying-party\u2467\u2468"},{"id":"ref-for-relying-party\u2468\u24ea"}],"title":"5. Web Authentication API"},{"refs":[{"id":"ref-for-relying-party\u2468\u2460"},{"id":"ref-for-relying-party\u2468\u2461"},{"id":"ref-for-relying-party\u2468\u2462"},{"id":"ref-for-relying-party\u2468\u2463"},{"id":"ref-for-relying-party\u2468\u2464"}],"title":"5.1. PublicKeyCredential Interface"},{"refs":[{"id":"ref-for-relying-party\u2468\u2465"},{"id":"ref-for-relying-party\u2468\u2466"},{"id":"ref-for-relying-party\u2468\u2467"},{"id":"ref-for-relying-party\u2468\u2468"},{"id":"ref-for-relying-party\u2460\u24ea\u24ea"},{"id":"ref-for-relying-party\u2460\u24ea\u2460"}],"title":"5.1.3. Create a New Credential - PublicKeyCredential\u2019s [[Create]](origin, options, sameOriginWithAncestors) Method"},{"refs":[{"id":"ref-for-relying-party\u2460\u24ea\u2461"},{"id":"ref-for-relying-party\u2460\u24ea\u2462"},{"id":"ref-for-relying-party\u2460\u24ea\u2463"},{"id":"ref-for-relying-party\u2460\u24ea\u2464"}],"title":"5.1.4. Use an Existing Credential to Make an Assertion - PublicKeyCredential\u2019s [[Get]](options) Method"},{"refs":[{"id":"ref-for-relying-party\u2460\u24ea\u2465"},{"id":"ref-for-relying-party\u2460\u24ea\u2466"}],"title":"5.1.4.2. Issuing a Credential Request to an Authenticator"},{"refs":[{"id":"ref-for-relying-party\u2460\u24ea\u2467"}],"title":"5.1.6. Availability of User-Verifying Platform Authenticator - PublicKeyCredential\u2019s isUserVerifyingPlatformAuthenticatorAvailable() Method"},{"refs":[{"id":"ref-for-relying-party\u2460\u24ea\u2468"},{"id":"ref-for-relying-party\u2460\u2460\u24ea"}],"title":"5.1.7. Availability of client capabilities - PublicKeyCredential\u2019s getClientCapabilities() Method"},{"refs":[{"id":"ref-for-relying-party\u2460\u2460\u2460"}],"title":"5.2. Authenticator Responses (interface AuthenticatorResponse)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2460\u2461"},{"id":"ref-for-relying-party\u2460\u2460\u2462"}],"title":"5.2.1. Information About Public Key Credential (interface AuthenticatorAttestationResponse)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2460\u2463"},{"id":"ref-for-relying-party\u2460\u2460\u2464"},{"id":"ref-for-relying-party\u2460\u2460\u2465"},{"id":"ref-for-relying-party\u2460\u2460\u2466"},{"id":"ref-for-relying-party\u2460\u2460\u2467"},{"id":"ref-for-relying-party\u2460\u2460\u2468"},{"id":"ref-for-relying-party\u2460\u2461\u24ea"}],"title":"5.2.1.1. Easily accessing credential data"},{"refs":[{"id":"ref-for-relying-party\u2460\u2461\u2460"},{"id":"ref-for-relying-party\u2460\u2461\u2461"},{"id":"ref-for-relying-party\u2460\u2461\u2462"},{"id":"ref-for-relying-party\u2460\u2461\u2463"},{"id":"ref-for-relying-party\u2460\u2461\u2464"},{"id":"ref-for-relying-party\u2460\u2461\u2465"},{"id":"ref-for-relying-party\u2460\u2461\u2466"},{"id":"ref-for-relying-party\u2460\u2461\u2467"},{"id":"ref-for-relying-party\u2460\u2461\u2468"},{"id":"ref-for-relying-party\u2460\u2462\u24ea"},{"id":"ref-for-relying-party\u2460\u2462\u2460"}],"title":"5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2462\u2461"},{"id":"ref-for-relying-party\u2460\u2462\u2462"},{"id":"ref-for-relying-party\u2460\u2462\u2463"},{"id":"ref-for-relying-party\u2460\u2462\u2464"},{"id":"ref-for-relying-party\u2460\u2462\u2465"},{"id":"ref-for-relying-party\u2460\u2462\u2466"}],"title":"5.4.1. Public Key Entity Description (dictionary PublicKeyCredentialEntity)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2462\u2467"},{"id":"ref-for-relying-party\u2460\u2462\u2468"}],"title":"5.4.2. Relying Party Parameters for Credential Generation (dictionary PublicKeyCredentialRpEntity)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2463\u24ea"},{"id":"ref-for-relying-party\u2460\u2463\u2460"},{"id":"ref-for-relying-party\u2460\u2463\u2461"},{"id":"ref-for-relying-party\u2460\u2463\u2462"},{"id":"ref-for-relying-party\u2460\u2463\u2463"}],"title":"5.4.3. User Account Parameters for Credential Generation (dictionary PublicKeyCredentialUserEntity)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2463\u2464"},{"id":"ref-for-relying-party\u2460\u2463\u2465"},{"id":"ref-for-relying-party\u2460\u2463\u2466"}],"title":"5.4.4. Authenticator Selection Criteria (dictionary AuthenticatorSelectionCriteria)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2463\u2467"},{"id":"ref-for-relying-party\u2460\u2463\u2468"},{"id":"ref-for-relying-party\u2460\u2464\u24ea"}],"title":"5.4.5. Authenticator Attachment Enumeration (enum AuthenticatorAttachment)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2464\u2460"},{"id":"ref-for-relying-party\u2460\u2464\u2461"},{"id":"ref-for-relying-party\u2460\u2464\u2462"},{"id":"ref-for-relying-party\u2460\u2464\u2463"},{"id":"ref-for-relying-party\u2460\u2464\u2464"},{"id":"ref-for-relying-party\u2460\u2464\u2465"}],"title":"5.4.6. Resident Key Requirement Enumeration (enum ResidentKeyRequirement)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2464\u2466"},{"id":"ref-for-relying-party\u2460\u2464\u2467"},{"id":"ref-for-relying-party\u2460\u2464\u2468"},{"id":"ref-for-relying-party\u2460\u2465\u24ea"},{"id":"ref-for-relying-party\u2460\u2465\u2460"},{"id":"ref-for-relying-party\u2460\u2465\u2461"},{"id":"ref-for-relying-party\u2460\u2465\u2462"},{"id":"ref-for-relying-party\u2460\u2465\u2463"}],"title":"5.4.7. Attestation Conveyance Preference Enumeration (enum AttestationConveyancePreference)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2465\u2464"},{"id":"ref-for-relying-party\u2460\u2465\u2465"},{"id":"ref-for-relying-party\u2460\u2465\u2466"},{"id":"ref-for-relying-party\u2460\u2465\u2467"},{"id":"ref-for-relying-party\u2460\u2465\u2468"},{"id":"ref-for-relying-party\u2460\u2466\u24ea"},{"id":"ref-for-relying-party\u2460\u2466\u2460"},{"id":"ref-for-relying-party\u2460\u2466\u2461"},{"id":"ref-for-relying-party\u2460\u2466\u2462"}],"title":"5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2466\u2463"}],"title":"5.7.3. Authentication Extensions Authenticator Inputs (CDDL type AuthenticationExtensionsAuthenticatorInputs)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2466\u2464"},{"id":"ref-for-relying-party\u2460\u2466\u2465"},{"id":"ref-for-relying-party\u2460\u2466\u2466"},{"id":"ref-for-relying-party\u2460\u2466\u2467"},{"id":"ref-for-relying-party\u2460\u2466\u2468"}],"title":"5.8.1. Client Data Used in WebAuthn Signatures (dictionary CollectedClientData)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2467\u24ea"}],"title":"5.8.4. Authenticator Transport Enumeration (enum AuthenticatorTransport)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2467\u2460"},{"id":"ref-for-relying-party\u2460\u2467\u2461"},{"id":"ref-for-relying-party\u2460\u2467\u2462"}],"title":"5.8.6. User Verification Requirement Enumeration (enum UserVerificationRequirement)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2467\u2463"}],"title":"5.8.7. Client Capability Enumeration (enum ClientCapability)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2467\u2464"},{"id":"ref-for-relying-party\u2460\u2467\u2465"},{"id":"ref-for-relying-party\u2460\u2467\u2466"},{"id":"ref-for-relying-party\u2460\u2467\u2467"},{"id":"ref-for-relying-party\u2460\u2467\u2468"},{"id":"ref-for-relying-party\u2460\u2468\u24ea"},{"id":"ref-for-relying-party\u2460\u2468\u2460"}],"title":"5.8.8. User-agent Hints Enumeration (enum PublicKeyCredentialHints)"},{"refs":[{"id":"ref-for-relying-party\u2460\u2468\u2461"}],"title":"5.10. Using Web Authentication within iframe elements"},{"refs":[{"id":"ref-for-relying-party\u2460\u2468\u2462"}],"title":"5.11. Using Web Authentication across related origins"},{"refs":[{"id":"ref-for-relying-party\u2460\u2468\u2463"},{"id":"ref-for-relying-party\u2460\u2468\u2464"},{"id":"ref-for-relying-party\u2460\u2468\u2465"},{"id":"ref-for-relying-party\u2460\u2468\u2466"},{"id":"ref-for-relying-party\u2460\u2468\u2467"}],"title":"6. WebAuthn Authenticator Model"},{"refs":[{"id":"ref-for-relying-party\u2460\u2468\u2468"}],"title":"6.1. Authenticator Data"},{"refs":[{"id":"ref-for-relying-party\u2461\u24ea\u24ea"},{"id":"ref-for-relying-party\u2461\u24ea\u2460"},{"id":"ref-for-relying-party\u2461\u24ea\u2461"},{"id":"ref-for-relying-party\u2461\u24ea\u2462"},{"id":"ref-for-relying-party\u2461\u24ea\u2463"}],"title":"6.1.1. Signature Counter Considerations"},{"refs":[{"id":"ref-for-relying-party\u2461\u24ea\u2464"},{"id":"ref-for-relying-party\u2461\u24ea\u2465"},{"id":"ref-for-relying-party\u2461\u24ea\u2466"},{"id":"ref-for-relying-party\u2461\u24ea\u2467"},{"id":"ref-for-relying-party\u2461\u24ea\u2468"}],"title":"6.1.3. Credential Backup State"},{"refs":[{"id":"ref-for-relying-party\u2461\u2460\u24ea"}],"title":"6.2. Authenticator Taxonomy"},{"refs":[{"id":"ref-for-relying-party\u2461\u2460\u2460"},{"id":"ref-for-relying-party\u2461\u2460\u2461"},{"id":"ref-for-relying-party\u2461\u2460\u2462"}],"title":"6.2.2. Credential Storage Modality"},{"refs":[{"id":"ref-for-relying-party\u2461\u2460\u2463"},{"id":"ref-for-relying-party\u2461\u2460\u2464"},{"id":"ref-for-relying-party\u2461\u2460\u2465"}],"title":"6.2.3. Authentication Factor Capability"},{"refs":[{"id":"ref-for-relying-party\u2461\u2460\u2466"},{"id":"ref-for-relying-party\u2461\u2460\u2467"},{"id":"ref-for-relying-party\u2461\u2460\u2468"},{"id":"ref-for-relying-party\u2461\u2461\u24ea"},{"id":"ref-for-relying-party\u2461\u2461\u2460"},{"id":"ref-for-relying-party\u2461\u2461\u2461"},{"id":"ref-for-relying-party\u2461\u2461\u2462"}],"title":"6.3.2. The authenticatorMakeCredential Operation"},{"refs":[{"id":"ref-for-relying-party\u2461\u2461\u2463"},{"id":"ref-for-relying-party\u2461\u2461\u2464"},{"id":"ref-for-relying-party\u2461\u2461\u2465"}],"title":"6.3.3. The authenticatorGetAssertion Operation"},{"refs":[{"id":"ref-for-relying-party\u2461\u2461\u2466"}],"title":"6.4. String Handling"},{"refs":[{"id":"ref-for-relying-party\u2461\u2461\u2467"}],"title":"6.4.1.1. String Truncation by Clients"},{"refs":[{"id":"ref-for-relying-party\u2461\u2461\u2468"},{"id":"ref-for-relying-party\u2461\u2462\u24ea"},{"id":"ref-for-relying-party\u2461\u2462\u2460"},{"id":"ref-for-relying-party\u2461\u2462\u2461"},{"id":"ref-for-relying-party\u2461\u2462\u2462"},{"id":"ref-for-relying-party\u2461\u2462\u2463"},{"id":"ref-for-relying-party\u2461\u2462\u2464"},{"id":"ref-for-relying-party\u2461\u2462\u2465"}],"title":"6.5. Attestation"},{"refs":[{"id":"ref-for-relying-party\u2461\u2462\u2466"},{"id":"ref-for-relying-party\u2461\u2462\u2467"},{"id":"ref-for-relying-party\u2461\u2462\u2468"},{"id":"ref-for-relying-party\u2461\u2463\u24ea"},{"id":"ref-for-relying-party\u2461\u2463\u2460"}],"title":"6.5.3. Attestation Types"},{"refs":[{"id":"ref-for-relying-party\u2461\u2463\u2461"},{"id":"ref-for-relying-party\u2461\u2463\u2462"},{"id":"ref-for-relying-party\u2461\u2463\u2463"},{"id":"ref-for-relying-party\u2461\u2463\u2464"}],"title":"7. WebAuthn Relying Party Operations"},{"refs":[{"id":"ref-for-relying-party\u2461\u2463\u2465"},{"id":"ref-for-relying-party\u2461\u2463\u2466"},{"id":"ref-for-relying-party\u2461\u2463\u2467"},{"id":"ref-for-relying-party\u2461\u2463\u2468"},{"id":"ref-for-relying-party\u2461\u2464\u24ea"},{"id":"ref-for-relying-party\u2461\u2464\u2460"},{"id":"ref-for-relying-party\u2461\u2464\u2461"},{"id":"ref-for-relying-party\u2461\u2464\u2462"},{"id":"ref-for-relying-party\u2461\u2464\u2463"},{"id":"ref-for-relying-party\u2461\u2464\u2464"},{"id":"ref-for-relying-party\u2461\u2464\u2465"},{"id":"ref-for-relying-party\u2461\u2464\u2466"},{"id":"ref-for-relying-party\u2461\u2464\u2467"},{"id":"ref-for-relying-party\u2461\u2464\u2468"},{"id":"ref-for-relying-party\u2461\u2465\u24ea"},{"id":"ref-for-relying-party\u2461\u2465\u2460"},{"id":"ref-for-relying-party\u2461\u2465\u2461"},{"id":"ref-for-relying-party\u2461\u2465\u2462"},{"id":"ref-for-relying-party\u2461\u2465\u2463"},{"id":"ref-for-relying-party\u2461\u2465\u2464"},{"id":"ref-for-relying-party\u2461\u2465\u2465"},{"id":"ref-for-relying-party\u2461\u2465\u2466"},{"id":"ref-for-relying-party\u2461\u2465\u2467"},{"id":"ref-for-relying-party\u2461\u2465\u2468"},{"id":"ref-for-relying-party\u2461\u2466\u24ea"},{"id":"ref-for-relying-party\u2461\u2466\u2460"}],"title":"7.1. Registering a New Credential"},{"refs":[{"id":"ref-for-relying-party\u2461\u2466\u2461"},{"id":"ref-for-relying-party\u2461\u2466\u2462"},{"id":"ref-for-relying-party\u2461\u2466\u2463"},{"id":"ref-for-relying-party\u2461\u2466\u2464"},{"id":"ref-for-relying-party\u2461\u2466\u2465"},{"id":"ref-for-relying-party\u2461\u2466\u2466"},{"id":"ref-for-relying-party\u2461\u2466\u2467"},{"id":"ref-for-relying-party\u2461\u2466\u2468"},{"id":"ref-for-relying-party\u2461\u2467\u24ea"},{"id":"ref-for-relying-party\u2461\u2467\u2460"},{"id":"ref-for-relying-party\u2461\u2467\u2461"},{"id":"ref-for-relying-party\u2461\u2467\u2462"},{"id":"ref-for-relying-party\u2461\u2467\u2463"},{"id":"ref-for-relying-party\u2461\u2467\u2464"},{"id":"ref-for-relying-party\u2461\u2467\u2465"},{"id":"ref-for-relying-party\u2461\u2467\u2466"},{"id":"ref-for-relying-party\u2461\u2467\u2467"},{"id":"ref-for-relying-party\u2461\u2467\u2468"}],"title":"7.2. Verifying an Authentication Assertion"},{"refs":[{"id":"ref-for-relying-party\u2461\u2468\u24ea"},{"id":"ref-for-relying-party\u2461\u2468\u2460"}],"title":"8.2.1. Packed Attestation Statement Certificate Requirements"},{"refs":[{"id":"ref-for-relying-party\u2461\u2468\u2461"},{"id":"ref-for-relying-party\u2461\u2468\u2462"}],"title":"8.9. Compound Attestation Statement Format"},{"refs":[{"id":"ref-for-relying-party\u2461\u2468\u2463"},{"id":"ref-for-relying-party\u2461\u2468\u2464"},{"id":"ref-for-relying-party\u2461\u2468\u2465"}],"title":"9. WebAuthn Extensions"},{"refs":[{"id":"ref-for-relying-party\u2461\u2468\u2466"}],"title":"9.2. Defining Extensions"},{"refs":[{"id":"ref-for-relying-party\u2461\u2468\u2467"},{"id":"ref-for-relying-party\u2461\u2468\u2468"},{"id":"ref-for-relying-party\u2462\u24ea\u24ea"}],"title":"9.3. Extending Request Parameters"},{"refs":[{"id":"ref-for-relying-party\u2462\u24ea\u2460"}],"title":"9.5. Authenticator Extension Processing"},{"refs":[{"id":"ref-for-relying-party\u2462\u24ea\u2461"},{"id":"ref-for-relying-party\u2462\u24ea\u2462"},{"id":"ref-for-relying-party\u2462\u24ea\u2463"},{"id":"ref-for-relying-party\u2462\u24ea\u2464"},{"id":"ref-for-relying-party\u2462\u24ea\u2465"}],"title":"10.1.1. FIDO AppID Extension (appid)"},{"refs":[{"id":"ref-for-relying-party\u2462\u24ea\u2466"},{"id":"ref-for-relying-party\u2462\u24ea\u2467"}],"title":"10.1.2. FIDO AppID Exclusion Extension (appidExclude)"},{"refs":[{"id":"ref-for-relying-party\u2462\u24ea\u2468"},{"id":"ref-for-relying-party\u2462\u2460\u24ea"},{"id":"ref-for-relying-party\u2462\u2460\u2460"},{"id":"ref-for-relying-party\u2462\u2460\u2461"},{"id":"ref-for-relying-party\u2462\u2460\u2462"},{"id":"ref-for-relying-party\u2462\u2460\u2463"}],"title":"10.1.3. Credential Properties Extension (credProps)"},{"refs":[{"id":"ref-for-relying-party\u2462\u2460\u2464"},{"id":"ref-for-relying-party\u2462\u2460\u2465"},{"id":"ref-for-relying-party\u2462\u2460\u2466"}],"title":"10.1.4. Pseudo-random function extension (prf)"},{"refs":[{"id":"ref-for-relying-party\u2462\u2460\u2467"},{"id":"ref-for-relying-party\u2462\u2460\u2468"},{"id":"ref-for-relying-party\u2462\u2461\u24ea"},{"id":"ref-for-relying-party\u2462\u2461\u2460"},{"id":"ref-for-relying-party\u2462\u2461\u2461"},{"id":"ref-for-relying-party\u2462\u2461\u2462"},{"id":"ref-for-relying-party\u2462\u2461\u2463"},{"id":"ref-for-relying-party\u2462\u2461\u2464"}],"title":"10.1.5. Large blob storage extension (largeBlob)"},{"refs":[{"id":"ref-for-relying-party\u2462\u2461\u2465"},{"id":"ref-for-relying-party\u2462\u2461\u2466"}],"title":"10.2.1. Supplemental public keys extension (supplementalPubKeys)"},{"refs":[{"id":"ref-for-relying-party\u2462\u2461\u2467"},{"id":"ref-for-relying-party\u2462\u2461\u2468"},{"id":"ref-for-relying-party\u2462\u2462\u24ea"},{"id":"ref-for-relying-party\u2462\u2462\u2460"}],"title":"10.2.1.1. Relying Party Usage"},{"refs":[{"id":"ref-for-relying-party\u2462\u2462\u2461"},{"id":"ref-for-relying-party\u2462\u2462\u2462"},{"id":"ref-for-relying-party\u2462\u2462\u2463"},{"id":"ref-for-relying-party\u2462\u2462\u2464"},{"id":"ref-for-relying-party\u2462\u2462\u2465"},{"id":"ref-for-relying-party\u2462\u2462\u2466"},{"id":"ref-for-relying-party\u2462\u2462\u2467"}],"title":"10.2.1.2. Extension Definition"},{"refs":[{"id":"ref-for-relying-party\u2462\u2462\u2468"}],"title":"10.2.1.2.1. AAGUIDs"},{"refs":[{"id":"ref-for-relying-party\u2462\u2463\u24ea"}],"title":"10.2.1.2.2. Attestation calculations"},{"refs":[{"id":"ref-for-relying-party\u2462\u2463\u2460"}],"title":"10.2.1.3. supplementalPubKeys Extension Output Verification Procedures"},{"refs":[{"id":"ref-for-relying-party\u2462\u2463\u2461"},{"id":"ref-for-relying-party\u2462\u2463\u2462"},{"id":"ref-for-relying-party\u2462\u2463\u2463"},{"id":"ref-for-relying-party\u2462\u2463\u2464"}],"title":"10.2.1.3.1. Registration (create())"},{"refs":[{"id":"ref-for-relying-party\u2462\u2463\u2465"},{"id":"ref-for-relying-party\u2462\u2463\u2466"},{"id":"ref-for-relying-party\u2462\u2463\u2467"},{"id":"ref-for-relying-party\u2462\u2463\u2468"},{"id":"ref-for-relying-party\u2462\u2464\u24ea"},{"id":"ref-for-relying-party\u2462\u2464\u2460"},{"id":"ref-for-relying-party\u2462\u2464\u2461"}],"title":"10.2.1.3.2. Authentication (get())"},{"refs":[{"id":"ref-for-relying-party\u2462\u2464\u2462"}],"title":"12.4. WebAuthn Extension Identifier Registrations"},{"refs":[{"id":"ref-for-relying-party\u2462\u2464\u2463"},{"id":"ref-for-relying-party\u2462\u2464\u2464"},{"id":"ref-for-relying-party\u2462\u2464\u2465"},{"id":"ref-for-relying-party\u2462\u2464\u2466"}],"title":"13. Security Considerations"},{"refs":[{"id":"ref-for-relying-party\u2462\u2464\u2467"},{"id":"ref-for-relying-party\u2462\u2464\u2468"}],"title":"13.2. Physical Proximity between Client and Authenticator"},{"refs":[{"id":"ref-for-relying-party\u2462\u2465\u24ea"},{"id":"ref-for-relying-party\u2462\u2465\u2460"}],"title":"13.3.2. Attestation Certificate and Attestation Certificate CA Compromise"},{"refs":[{"id":"ref-for-relying-party\u2462\u2465\u2461"}],"title":"13.4. Security considerations for Relying Parties"},{"refs":[{"id":"ref-for-relying-party\u2462\u2465\u2462"},{"id":"ref-for-relying-party\u2462\u2465\u2463"},{"id":"ref-for-relying-party\u2462\u2465\u2464"},{"id":"ref-for-relying-party\u2462\u2465\u2465"},{"id":"ref-for-relying-party\u2462\u2465\u2466"},{"id":"ref-for-relying-party\u2462\u2465\u2467"}],"title":"13.4.1. Security Benefits for WebAuthn Relying Parties"},{"refs":[{"id":"ref-for-relying-party\u2462\u2465\u2468"},{"id":"ref-for-relying-party\u2462\u2466\u24ea"},{"id":"ref-for-relying-party\u2462\u2466\u2460"},{"id":"ref-for-relying-party\u2462\u2466\u2461"}],"title":"13.4.2. Visibility Considerations for Embedded Usage"},{"refs":[{"id":"ref-for-relying-party\u2462\u2466\u2462"},{"id":"ref-for-relying-party\u2462\u2466\u2463"}],"title":"13.4.3. Cryptographic Challenges"},{"refs":[{"id":"ref-for-relying-party\u2462\u2466\u2464"},{"id":"ref-for-relying-party\u2462\u2466\u2465"},{"id":"ref-for-relying-party\u2462\u2466\u2466"},{"id":"ref-for-relying-party\u2462\u2466\u2467"},{"id":"ref-for-relying-party\u2462\u2466\u2468"},{"id":"ref-for-relying-party\u2462\u2467\u24ea"},{"id":"ref-for-relying-party\u2462\u2467\u2460"},{"id":"ref-for-relying-party\u2462\u2467\u2461"}],"title":"13.4.4. Attestation Limitations"},{"refs":[{"id":"ref-for-relying-party\u2462\u2467\u2462"},{"id":"ref-for-relying-party\u2462\u2467\u2463"},{"id":"ref-for-relying-party\u2462\u2467\u2464"}],"title":"13.4.5. Revoked Attestation Certificates"},{"refs":[{"id":"ref-for-relying-party\u2462\u2467\u2465"},{"id":"ref-for-relying-party\u2462\u2467\u2466"},{"id":"ref-for-relying-party\u2462\u2467\u2467"}],"title":"13.4.6. Credential Loss and Key Mobility"},{"refs":[{"id":"ref-for-relying-party\u2462\u2467\u2468"},{"id":"ref-for-relying-party\u2462\u2468\u24ea"}],"title":"13.4.7. Unprotected account detection"},{"refs":[{"id":"ref-for-relying-party\u2462\u2468\u2460"},{"id":"ref-for-relying-party\u2462\u2468\u2461"},{"id":"ref-for-relying-party\u2462\u2468\u2462"},{"id":"ref-for-relying-party\u2462\u2468\u2463"},{"id":"ref-for-relying-party\u2462\u2468\u2464"},{"id":"ref-for-relying-party\u2462\u2468\u2465"},{"id":"ref-for-relying-party\u2462\u2468\u2466"},{"id":"ref-for-relying-party\u2462\u2468\u2467"},{"id":"ref-for-relying-party\u2462\u2468\u2468"}],"title":"13.4.8. Code injection attacks"},{"refs":[{"id":"ref-for-relying-party\u2463\u24ea\u24ea"},{"id":"ref-for-relying-party\u2463\u24ea\u2460"},{"id":"ref-for-relying-party\u2463\u24ea\u2461"},{"id":"ref-for-relying-party\u2463\u24ea\u2462"},{"id":"ref-for-relying-party\u2463\u24ea\u2463"},{"id":"ref-for-relying-party\u2463\u24ea\u2464"},{"id":"ref-for-relying-party\u2463\u24ea\u2465"}],"title":"13.4.9. Validating the origin of a credential"},{"refs":[{"id":"ref-for-relying-party\u2463\u24ea\u2466"}],"title":"14. Privacy Considerations"},{"refs":[{"id":"ref-for-relying-party\u2463\u24ea\u2467"},{"id":"ref-for-relying-party\u2463\u24ea\u2468"},{"id":"ref-for-relying-party\u2463\u2460\u24ea"},{"id":"ref-for-relying-party\u2463\u2460\u2460"},{"id":"ref-for-relying-party\u2463\u2460\u2461"},{"id":"ref-for-relying-party\u2463\u2460\u2462"},{"id":"ref-for-relying-party\u2463\u2460\u2463"}],"title":"14.1. De-anonymization Prevention Measures"},{"refs":[{"id":"ref-for-relying-party\u2463\u2460\u2464"},{"id":"ref-for-relying-party\u2463\u2460\u2465"},{"id":"ref-for-relying-party\u2463\u2460\u2466"},{"id":"ref-for-relying-party\u2463\u2460\u2467"},{"id":"ref-for-relying-party\u2463\u2460\u2468"},{"id":"ref-for-relying-party\u2463\u2461\u24ea"},{"id":"ref-for-relying-party\u2463\u2461\u2460"},{"id":"ref-for-relying-party\u2463\u2461\u2461"},{"id":"ref-for-relying-party\u2463\u2461\u2462"},{"id":"ref-for-relying-party\u2463\u2461\u2463"},{"id":"ref-for-relying-party\u2463\u2461\u2464"}],"title":"14.2. Anonymous, Scoped, Non-correlatable Public Key Credentials"},{"refs":[{"id":"ref-for-relying-party\u2463\u2461\u2465"},{"id":"ref-for-relying-party\u2463\u2461\u2466"},{"id":"ref-for-relying-party\u2463\u2461\u2467"},{"id":"ref-for-relying-party\u2463\u2461\u2468"},{"id":"ref-for-relying-party\u2463\u2462\u24ea"}],"title":"14.3. Authenticator-local Biometric Recognition"},{"refs":[{"id":"ref-for-relying-party\u2463\u2462\u2460"},{"id":"ref-for-relying-party\u2463\u2462\u2461"},{"id":"ref-for-relying-party\u2463\u2462\u2462"}],"title":"14.5.1. Registration Ceremony Privacy"},{"refs":[{"id":"ref-for-relying-party\u2463\u2462\u2463"},{"id":"ref-for-relying-party\u2463\u2462\u2464"},{"id":"ref-for-relying-party\u2463\u2462\u2465"}],"title":"14.5.2. Authentication Ceremony Privacy"},{"refs":[{"id":"ref-for-relying-party\u2463\u2462\u2466"}],"title":"14.6. Privacy considerations for Relying Parties"},{"refs":[{"id":"ref-for-relying-party\u2463\u2462\u2467"},{"id":"ref-for-relying-party\u2463\u2462\u2468"}],"title":"14.6.1. User Handle Contents"},{"refs":[{"id":"ref-for-relying-party\u2463\u2463\u24ea"},{"id":"ref-for-relying-party\u2463\u2463\u2460"},{"id":"ref-for-relying-party\u2463\u2463\u2461"},{"id":"ref-for-relying-party\u2463\u2463\u2462"},{"id":"ref-for-relying-party\u2463\u2463\u2463"},{"id":"ref-for-relying-party\u2463\u2463\u2464"},{"id":"ref-for-relying-party\u2463\u2463\u2465"},{"id":"ref-for-relying-party\u2463\u2463\u2466"},{"id":"ref-for-relying-party\u2463\u2463\u2467"},{"id":"ref-for-relying-party\u2463\u2463\u2468"},{"id":"ref-for-relying-party\u2463\u2464\u24ea"},{"id":"ref-for-relying-party\u2463\u2464\u2460"}],"title":"14.6.2. Username Enumeration"},{"refs":[{"id":"ref-for-relying-party\u2463\u2464\u2461"},{"id":"ref-for-relying-party\u2463\u2464\u2462"},{"id":"ref-for-relying-party\u2463\u2464\u2463"},{"id":"ref-for-relying-party\u2463\u2464\u2464"},{"id":"ref-for-relying-party\u2463\u2464\u2465"}],"title":"14.6.3. Privacy leak via credential IDs"},{"refs":[{"id":"ref-for-relying-party\u2463\u2464\u2466"}],"title":"15. Accessibility Considerations"},{"refs":[{"id":"ref-for-relying-party\u2463\u2464\u2467"}],"title":"15.1. Recommended Range for Ceremony Timeouts"}],"url":"#relying-party"},
 "relying-party-identifier": {"dfnID":"relying-party-identifier","dfnText":"Relying Party Identifier","external":false,"refSections":[{"refs":[{"id":"ref-for-relying-party-identifier"},{"id":"ref-for-relying-party-identifier\u2460"},{"id":"ref-for-relying-party-identifier\u2461"}],"title":"4. Terminology"},{"refs":[{"id":"ref-for-relying-party-identifier\u2462"}],"title":"5. Web Authentication API"},{"refs":[{"id":"ref-for-relying-party-identifier\u2463"}],"title":"6.3.5. The silentCredentialDiscovery operation"}],"url":"#relying-party-identifier"},
 "remove-all-credentials": {"dfnID":"remove-all-credentials","dfnText":"Remove All Credentials","external":false,"refSections":[{"refs":[{"id":"ref-for-remove-all-credentials"}],"title":"11.8. Remove All Credentials"}],"url":"#remove-all-credentials"},
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@@ -11649,7 +11794,7 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
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 "roaming-credential": {"dfnID":"roaming-credential","dfnText":"roaming\ncredential","external":false,"refSections":[{"refs":[{"id":"ref-for-roaming-credential"}],"title":"5.4.5. Authenticator Attachment Enumeration (enum AuthenticatorAttachment)"},{"refs":[{"id":"ref-for-roaming-credential\u2460"}],"title":"13.4.6. Credential Loss and Key Mobility"}],"url":"#roaming-credential"},
-"rp-id": {"dfnID":"rp-id","dfnText":"RP ID","external":false,"refSections":[{"refs":[{"id":"ref-for-rp-id"},{"id":"ref-for-rp-id\u2460"},{"id":"ref-for-rp-id\u2461"},{"id":"ref-for-rp-id\u2462"},{"id":"ref-for-rp-id\u2463"},{"id":"ref-for-rp-id\u2464"},{"id":"ref-for-rp-id\u2465"},{"id":"ref-for-rp-id\u2466"},{"id":"ref-for-rp-id\u2467"},{"id":"ref-for-rp-id\u2468"},{"id":"ref-for-rp-id\u2460\u24ea"},{"id":"ref-for-rp-id\u2460\u2460"}],"title":"4. Terminology"},{"refs":[{"id":"ref-for-rp-id\u2460\u2461"},{"id":"ref-for-rp-id\u2460\u2462"},{"id":"ref-for-rp-id\u2460\u2463"},{"id":"ref-for-rp-id\u2460\u2464"},{"id":"ref-for-rp-id\u2460\u2465"}],"title":"5. Web Authentication API"},{"refs":[{"id":"ref-for-rp-id\u2460\u2466"},{"id":"ref-for-rp-id\u2460\u2467"}],"title":"5.1.3. Create a New Credential - PublicKeyCredential\u2019s [[Create]](origin, options, sameOriginWithAncestors) Method"},{"refs":[{"id":"ref-for-rp-id\u2460\u2468"},{"id":"ref-for-rp-id\u2461\u24ea"}],"title":"5.1.4.1. PublicKeyCredential\u2019s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method"},{"refs":[{"id":"ref-for-rp-id\u2461\u2460"}],"title":"5.1.4.2. Issuing a Credential Request to an Authenticator"},{"refs":[{"id":"ref-for-rp-id\u2461\u2461"}],"title":"5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)"},{"refs":[{"id":"ref-for-rp-id\u2461\u2462"}],"title":"5.4.2. Relying Party Parameters for Credential Generation (dictionary PublicKeyCredentialRpEntity)"},{"refs":[{"id":"ref-for-rp-id\u2461\u2463"}],"title":"5.4.7. Attestation Conveyance Preference Enumeration (enum AttestationConveyancePreference)"},{"refs":[{"id":"ref-for-rp-id\u2461\u2464"},{"id":"ref-for-rp-id\u2461\u2465"},{"id":"ref-for-rp-id\u2461\u2466"}],"title":"5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)"},{"refs":[{"id":"ref-for-rp-id\u2461\u2467"},{"id":"ref-for-rp-id\u2461\u2468"},{"id":"ref-for-rp-id\u2462\u24ea"},{"id":"ref-for-rp-id\u2462\u2460"},{"id":"ref-for-rp-id\u2462\u2461"},{"id":"ref-for-rp-id\u2462\u2462"}],"title":"6.1. Authenticator Data"},{"refs":[{"id":"ref-for-rp-id\u2462\u2463"}],"title":"6.3.2. The authenticatorMakeCredential Operation"},{"refs":[{"id":"ref-for-rp-id\u2462\u2464"}],"title":"6.3.3. The authenticatorGetAssertion Operation"},{"refs":[{"id":"ref-for-rp-id\u2462\u2465"}],"title":"6.3.5. The silentCredentialDiscovery operation"},{"refs":[{"id":"ref-for-rp-id\u2462\u2466"}],"title":"7.1. Registering a New Credential"},{"refs":[{"id":"ref-for-rp-id\u2462\u2467"}],"title":"7.2. Verifying an Authentication Assertion"},{"refs":[{"id":"ref-for-rp-id\u2462\u2468"}],"title":"8.4. Android Key Attestation Statement Format"},{"refs":[{"id":"ref-for-rp-id\u2463\u24ea"}],"title":"8.6. FIDO U2F Attestation Statement Format"},{"refs":[{"id":"ref-for-rp-id\u2463\u2460"},{"id":"ref-for-rp-id\u2463\u2461"},{"id":"ref-for-rp-id\u2463\u2462"},{"id":"ref-for-rp-id\u2463\u2463"},{"id":"ref-for-rp-id\u2463\u2464"},{"id":"ref-for-rp-id\u2463\u2465"},{"id":"ref-for-rp-id\u2463\u2466"}],"title":"10.1.1. FIDO AppID Extension (appid)"},{"refs":[{"id":"ref-for-rp-id\u2463\u2467"}],"title":"10.2.1.2. Extension Definition"},{"refs":[{"id":"ref-for-rp-id\u2463\u2468"}],"title":"11.5. Add Credential"},{"refs":[{"id":"ref-for-rp-id\u2464\u24ea"},{"id":"ref-for-rp-id\u2464\u2460"}],"title":"13.4.8. Code injection attacks"},{"refs":[{"id":"ref-for-rp-id\u2464\u2461"},{"id":"ref-for-rp-id\u2464\u2462"},{"id":"ref-for-rp-id\u2464\u2463"},{"id":"ref-for-rp-id\u2464\u2464"}],"title":"13.4.9. Validating the origin of a credential"}],"url":"#rp-id"},
+"rp-id": {"dfnID":"rp-id","dfnText":"RP ID","external":false,"refSections":[{"refs":[{"id":"ref-for-rp-id"},{"id":"ref-for-rp-id\u2460"},{"id":"ref-for-rp-id\u2461"},{"id":"ref-for-rp-id\u2462"},{"id":"ref-for-rp-id\u2463"},{"id":"ref-for-rp-id\u2464"},{"id":"ref-for-rp-id\u2465"},{"id":"ref-for-rp-id\u2466"},{"id":"ref-for-rp-id\u2467"},{"id":"ref-for-rp-id\u2468"},{"id":"ref-for-rp-id\u2460\u24ea"},{"id":"ref-for-rp-id\u2460\u2460"}],"title":"4. Terminology"},{"refs":[{"id":"ref-for-rp-id\u2460\u2461"},{"id":"ref-for-rp-id\u2460\u2462"},{"id":"ref-for-rp-id\u2460\u2463"},{"id":"ref-for-rp-id\u2460\u2464"},{"id":"ref-for-rp-id\u2460\u2465"}],"title":"5. Web Authentication API"},{"refs":[{"id":"ref-for-rp-id\u2460\u2466"},{"id":"ref-for-rp-id\u2460\u2467"}],"title":"5.1.3. Create a New Credential - PublicKeyCredential\u2019s [[Create]](origin, options, sameOriginWithAncestors) Method"},{"refs":[{"id":"ref-for-rp-id\u2460\u2468"},{"id":"ref-for-rp-id\u2461\u24ea"}],"title":"5.1.4.1. PublicKeyCredential\u2019s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method"},{"refs":[{"id":"ref-for-rp-id\u2461\u2460"}],"title":"5.1.4.2. Issuing a Credential Request to an Authenticator"},{"refs":[{"id":"ref-for-rp-id\u2461\u2461"}],"title":"5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)"},{"refs":[{"id":"ref-for-rp-id\u2461\u2462"}],"title":"5.4.2. Relying Party Parameters for Credential Generation (dictionary PublicKeyCredentialRpEntity)"},{"refs":[{"id":"ref-for-rp-id\u2461\u2463"}],"title":"5.4.7. Attestation Conveyance Preference Enumeration (enum AttestationConveyancePreference)"},{"refs":[{"id":"ref-for-rp-id\u2461\u2464"},{"id":"ref-for-rp-id\u2461\u2465"},{"id":"ref-for-rp-id\u2461\u2466"}],"title":"5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)"},{"refs":[{"id":"ref-for-rp-id\u2461\u2467"},{"id":"ref-for-rp-id\u2461\u2468"},{"id":"ref-for-rp-id\u2462\u24ea"}],"title":"5.11. Using Web Authentication across related origins"},{"refs":[{"id":"ref-for-rp-id\u2462\u2460"},{"id":"ref-for-rp-id\u2462\u2461"},{"id":"ref-for-rp-id\u2462\u2462"},{"id":"ref-for-rp-id\u2462\u2463"},{"id":"ref-for-rp-id\u2462\u2464"},{"id":"ref-for-rp-id\u2462\u2465"}],"title":"6.1. Authenticator Data"},{"refs":[{"id":"ref-for-rp-id\u2462\u2466"}],"title":"6.3.2. The authenticatorMakeCredential Operation"},{"refs":[{"id":"ref-for-rp-id\u2462\u2467"}],"title":"6.3.3. The authenticatorGetAssertion Operation"},{"refs":[{"id":"ref-for-rp-id\u2462\u2468"}],"title":"6.3.5. The silentCredentialDiscovery operation"},{"refs":[{"id":"ref-for-rp-id\u2463\u24ea"}],"title":"7.1. Registering a New Credential"},{"refs":[{"id":"ref-for-rp-id\u2463\u2460"}],"title":"7.2. Verifying an Authentication Assertion"},{"refs":[{"id":"ref-for-rp-id\u2463\u2461"}],"title":"8.4. Android Key Attestation Statement Format"},{"refs":[{"id":"ref-for-rp-id\u2463\u2462"}],"title":"8.6. FIDO U2F Attestation Statement Format"},{"refs":[{"id":"ref-for-rp-id\u2463\u2463"},{"id":"ref-for-rp-id\u2463\u2464"},{"id":"ref-for-rp-id\u2463\u2465"},{"id":"ref-for-rp-id\u2463\u2466"},{"id":"ref-for-rp-id\u2463\u2467"},{"id":"ref-for-rp-id\u2463\u2468"},{"id":"ref-for-rp-id\u2464\u24ea"}],"title":"10.1.1. FIDO AppID Extension (appid)"},{"refs":[{"id":"ref-for-rp-id\u2464\u2460"}],"title":"10.2.1.2. Extension Definition"},{"refs":[{"id":"ref-for-rp-id\u2464\u2461"}],"title":"11.5. Add Credential"},{"refs":[{"id":"ref-for-rp-id\u2464\u2462"},{"id":"ref-for-rp-id\u2464\u2463"}],"title":"13.4.8. Code injection attacks"},{"refs":[{"id":"ref-for-rp-id\u2464\u2464"},{"id":"ref-for-rp-id\u2464\u2465"},{"id":"ref-for-rp-id\u2464\u2466"},{"id":"ref-for-rp-id\u2464\u2467"},{"id":"ref-for-rp-id\u2464\u2468"}],"title":"13.4.9. Validating the origin of a credential"}],"url":"#rp-id"},
 "scope": {"dfnID":"scope","dfnText":"scope","external":false,"refSections":[{"refs":[{"id":"ref-for-scope\u2461"},{"id":"ref-for-scope\u2462"},{"id":"ref-for-scope\u2463"}],"title":"1. Introduction"},{"refs":[{"id":"ref-for-scope\u2464"},{"id":"ref-for-scope\u2465"}],"title":"4. Terminology"},{"refs":[{"id":"ref-for-scope\u2466"},{"id":"ref-for-scope\u2467"}],"title":"5. Web Authentication API"},{"refs":[{"id":"ref-for-scope\u2468"}],"title":"5.1.4.2. Issuing a Credential Request to an Authenticator"},{"refs":[{"id":"ref-for-scope\u2460\u24ea"}],"title":"5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)"},{"refs":[{"id":"ref-for-scope\u2460\u2460"}],"title":"5.4.1. Public Key Entity Description (dictionary PublicKeyCredentialEntity)"},{"refs":[{"id":"ref-for-scope\u2460\u2461"},{"id":"ref-for-scope\u2460\u2462"}],"title":"5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)"},{"refs":[{"id":"ref-for-scope\u2460\u2463"},{"id":"ref-for-scope\u2460\u2464"}],"title":"6.1. Authenticator Data"},{"refs":[{"id":"ref-for-scope\u2460\u2465"}],"title":"8.4. Android Key Attestation Statement Format"},{"refs":[{"id":"ref-for-scope\u2460\u2466"}],"title":"8.6. FIDO U2F Attestation Statement Format"},{"refs":[{"id":"ref-for-scope\u2460\u2467"},{"id":"ref-for-scope\u2460\u2468"}],"title":"10.1.1. FIDO AppID Extension (appid)"},{"refs":[{"id":"ref-for-scope\u2461\u24ea"},{"id":"ref-for-scope\u2461\u2460"},{"id":"ref-for-scope\u2461\u2461"}],"title":"13.2. Physical Proximity between Client and Authenticator"},{"refs":[{"id":"ref-for-scope\u2461\u2462"}],"title":"13.4.4. Attestation Limitations"},{"refs":[{"id":"ref-for-scope\u2461\u2463"},{"id":"ref-for-scope\u2461\u2464"},{"id":"ref-for-scope\u2461\u2465"},{"id":"ref-for-scope\u2461\u2466"},{"id":"ref-for-scope\u2461\u2467"}],"title":"13.4.8. Code injection attacks"},{"refs":[{"id":"ref-for-scope\u2461\u2468"},{"id":"ref-for-scope\u2462\u24ea"}],"title":"13.4.9. Validating the origin of a credential"},{"refs":[{"id":"ref-for-scope\u2462\u2460"}],"title":"14.2. Anonymous, Scoped, Non-correlatable Public Key Credentials"}],"url":"#scope"},
 "second-factor-platform-authenticator": {"dfnID":"second-factor-platform-authenticator","dfnText":"Second-factor platform authenticator","external":false,"refSections":[{"refs":[{"id":"ref-for-second-factor-platform-authenticator"}],"title":"6.2. Authenticator Taxonomy"}],"url":"#second-factor-platform-authenticator"},
 "second-factor-roaming-authenticator": {"dfnID":"second-factor-roaming-authenticator","dfnText":"Second-factor roaming authenticator","external":false,"refSections":[{"refs":[{"id":"ref-for-second-factor-roaming-authenticator"}],"title":"6.2. Authenticator Taxonomy"}],"url":"#second-factor-roaming-authenticator"},
@@ -11670,7 +11815,7 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
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+"https://url.spec.whatwg.org/#domain-label": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"url","spec":"url","status":"current","text":"domain label","type":"dfn","url":"https://url.spec.whatwg.org/#domain-label"},
 "https://url.spec.whatwg.org/#empty-host": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"url","spec":"url","status":"current","text":"empty host","type":"dfn","url":"https://url.spec.whatwg.org/#empty-host"},
+"https://url.spec.whatwg.org/#host-public-suffix": {"export":true,"for_":["host"],"level":"1","normative":true,"shortname":"url","spec":"url","status":"current","text":"public suffix","type":"dfn","url":"https://url.spec.whatwg.org/#host-public-suffix"},
+"https://url.spec.whatwg.org/#host-registrable-domain": {"export":true,"for_":["host"],"level":"1","normative":true,"shortname":"url","spec":"url","status":"current","text":"registrable domain","type":"dfn","url":"https://url.spec.whatwg.org/#host-registrable-domain"},
 "https://url.spec.whatwg.org/#opaque-host": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"url","spec":"url","status":"current","text":"opaque host","type":"dfn","url":"https://url.spec.whatwg.org/#opaque-host"},
 "https://url.spec.whatwg.org/#valid-domain": {"export":false,"for_":[],"level":"1","normative":true,"shortname":"url","spec":"url","status":"current","text":"valid domain","type":"dfn","url":"https://url.spec.whatwg.org/#valid-domain"},
 "https://url.spec.whatwg.org/#valid-domain-string": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"url","spec":"url","status":"current","text":"valid domain string","type":"dfn","url":"https://url.spec.whatwg.org/#valid-domain-string"},
@@ -12725,7 +12879,6 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
 "https://webidl.spec.whatwg.org/#idl-USVString": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"webidl","spec":"webidl","status":"current","text":"USVString","type":"interface","url":"https://webidl.spec.whatwg.org/#idl-USVString"},
 "https://webidl.spec.whatwg.org/#idl-boolean": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"webidl","spec":"webidl","status":"current","text":"boolean","type":"interface","url":"https://webidl.spec.whatwg.org/#idl-boolean"},
 "https://webidl.spec.whatwg.org/#idl-long": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"webidl","spec":"webidl","status":"current","text":"long","type":"interface","url":"https://webidl.spec.whatwg.org/#idl-long"},
-"https://webidl.spec.whatwg.org/#idl-long-long": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"webidl","spec":"webidl","status":"current","text":"long long","type":"interface","url":"https://webidl.spec.whatwg.org/#idl-long-long"},
 "https://webidl.spec.whatwg.org/#idl-object": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"webidl","spec":"webidl","status":"current","text":"object","type":"interface","url":"https://webidl.spec.whatwg.org/#idl-object"},
 "https://webidl.spec.whatwg.org/#idl-promise": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"webidl","spec":"webidl","status":"current","text":"Promise","type":"interface","url":"https://webidl.spec.whatwg.org/#idl-promise"},
 "https://webidl.spec.whatwg.org/#idl-record": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"webidl","spec":"webidl","status":"current","text":"record","type":"dfn","url":"https://webidl.spec.whatwg.org/#idl-record"},