Make ::backdrop stay in top layer while animating out

This patch adds a new internal pseudo class which matches popovers while they are still in the top layer after they have been closed in order to also make the corresponding ::backdrop stay in the top layer. This is based on futhark's patch: https://chromium-review.googlesource.com/c/chromium/src/+/4554016 HTML spec PR: whatwg/html#9387 Fixed: 1449145 Change-Id: I8e4831e960c5d18fb077f023c119fd0e678541df Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4585724 Reviewed-by: Mason Freed <masonf@chromium.org> Commit-Queue: Joey Arhar <jarhar@chromium.org> Cr-Commit-Position: refs/heads/main@{#1158640}
web-platform-tests · Jun 16, 2023 · c543914 · c543914
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diff --git a/css/css-position/overlay/overlay-transition-backdrop-entry.html b/css/css-position/overlay/overlay-transition-backdrop-entry.html
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+<!DOCTYPE html>
+<title>CSS Position Test: overlay transition with ::backdrop during entry animation</title>
+<link rel="help" href="https://drafts.csswg.org/css-position-4/#overlay">
+<link rel="match" href="green-ref.html">
+<link rel="author" href="mailto:jarhar@chromium.org">
+<style>
+  body {
+    background-color: green;
+  }
+  [popover] {
+    display: block;
+    visibility: hidden;
+    transition-delay: 2s;
+    transition-property: overlay;
+    transition-duration: 2s;
+  }
+  [popover]::backdrop {
+    background-color: blue;
+  }
+</style>
+<div popover id="foo"></div>
+<script>
+  foo.offsetTop;
+  foo.showPopover();
+</script>
diff --git a/css/css-position/overlay/overlay-transition-backdrop.html b/css/css-position/overlay/overlay-transition-backdrop.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<title>CSS Position Test: overlay transition with ::backdrop</title>
+<link rel="help" href="https://drafts.csswg.org/css-position-4/#overlay">
+<link rel="match" href="green-ref.html">
+<link rel="author" href="mailto:jarhar@chromium.org">
+<style>
+  [popover] {
+    display: block;
+    visibility: hidden;
+    transition: overlay 60s step-end;
+  }
+  [popover]::backdrop {
+    background-color: green;
+  }
+</style>
+<div popover id="foo"></div>
+<script>
+  foo.showPopover();
+  foo.hidePopover();
+</script>