dialog-backdrop-animation.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-animations/dialog-backdrop-animation.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<title>CSS Animations on a &lt;dialog> ::backdrop</title>

<link rel="help" href="https://drafts.csswg.org/css-animations-1/">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="support/testcommon.js"></script>

<style>

dialog[open]::backdrop {

    animation: dialog-backdrop-animation 1ms;

@keyframes dialog-backdrop-animation {

    from { opacity: 0 }

</style>

<div id="log"></div>

<script>

"use strict";

promise_test(async t => {

  const dialog = addElement(t, "dialog");

  // Open the dialog a first time, this should trigger a CSS Animation.

  dialog.showModal();

  const animations = dialog.getAnimations({ subtree: true });

  assert_equals(animations.length, 1, "As the <dialog> is shown intially an animation is started on its ::backdrop");

  await animations[0].finished;

  await waitForNextFrame();

  dialog.close();

  assert_equals(dialog.getAnimations({ subtree: true }).length, 0, "As the <dialog> is closed the animation is removed from its ::backdrop");

  await waitForNextFrame();

  dialog.showModal();

  assert_equals(dialog.getAnimations({ subtree: true }).length, 1, "As the <dialog> is shown again an animation is started again on its ::backdrop");

}, "CSS Animations on a <dialog> ::backdrop are canceled and restarted as the dialog is hidden and shown");

</script>