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<!doctype html>
<meta charset=utf-8>
<title>CSS Animations on a <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>
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