Make dialog user-agent styles apply while in top layer

This makes it so that while the dialog element is doing an exit animation, its positioning etc. styles from the user-agent stylesheet still apply so it doesnt jump to a different spot while animating out. The :modal class is removed during this time which is why it was a problem before. We also can't just make all dialog elements always have these styles applied, because then they would also apply to non-modal dialogs. Spec: whatwg/html#9387 Fixed: 1451910 Change-Id: I4d2b240ab17879d6cf08f94f32d7c7577e9f53ea
web-platform-tests · Aug 3, 2023 · 0a9787e · 0a9787e
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diff --git a/css/css-position/overlay/overlay-transition-dialog-ref.html b/css/css-position/overlay/overlay-transition-dialog-ref.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<dialog>dialog</dialog>
+<script>
+document.querySelector('dialog').showModal();
+document.activeElement.blur();
+</script>
diff --git a/css/css-position/overlay/overlay-transition-dialog.html b/css/css-position/overlay/overlay-transition-dialog.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://drafts.csswg.org/css-position-4/#overlay">
+<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=1451910">
+<link rel=help href="https://github.com/whatwg/html/pull/9387">
+<link rel=match href="overlay-transition-dialog-ref.html">
+
+<dialog>dialog</dialog>
+
+<style>
+dialog.animate {
+  transition: overlay 2s allow-discrete, display 2s allow-discrete;
+}
+</style>
+
+<script>
+const dialog = document.querySelector('dialog');
+dialog.showModal();
+dialog.classList.add('animate');
+dialog.close();
+requestAnimationFrame(() => {
+  requestAnimationFrame(() => {
+    document.documentElement.classList.remove('reftest-wait');
+  });
+});
+</script>