mozilla-central/testing/web-platform/tests/css/css-animations/stability/animation-event-destroy-renderer.html

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<!DOCTYPE html>
<html>
<head>
<title>Destroy and Hide Element in Animation Event</title>
<!-- Note: this is effectively a crashtest, but as crashtests do not
support variants, authoring as a promise test -->
<meta name="variant" content="?animationstart">
<meta name="variant" content="?animationiteration">
<style>
.box {
height: 100px;
width: 100px;
margin: 10px;
background-color: blue;
/* Use a long duration and delay for precise control over when animation
events are triggered. With short animations, the animation-iteration
event could be dropped if the animation finishes too son. An
animation-iteration event does not fire when completing the last
iteration.
*/
animation-name: move;
animation-duration: 10000s;
animation-delay: 5000s;
animation-iteration-count: 2;
}
@keyframes move {
from { transform: translate(0px, 0px); }
to { transform: translate(100px, 0px); }
}
</style>
<div id="container">
<div id="box1" class="box"></div>
<div id="box2" class="box"></div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/gc.js"></script>
<script>
'use strict';
function eventPromise(target, event, callback) {
return new Promise(resolve => {
const listener = () => {
callback();
resolve();
};
target.addEventListener(event, listener,
{ once: true });
});
}
function setAnimationTime(time) {
document.getAnimations().forEach(a => a.currentTime = time);
}
promise_test(async t => {
const eventType = location.search.substring(1);
var box1 = document.getElementById('box1');
var box2 = document.getElementById('box2');
const promises = [];
promises.push(eventPromise(box1, eventType, () => {
box1.parentNode.removeChild(box1);
}));
promises.push(eventPromise(box2, eventType, () => {
box2.style.display = 'none';
}));
await Promise.all(document.getAnimations().map(a => a.ready));
promises.push(new Promise(resolve => {
requestAnimationFrame(() => {
// trip animationstart.
setAnimationTime(6000000);
requestAnimationFrame(() => {
// trip animationiteration on any animations that are still running.
setAnimationTime(16000000);
resolve();
});
});
}));
await Promise.all(promises);
// Garbage collection is best effort.
if (window.garbageCollect) {
await garbageCollect();
}
assert_equals(document.getAnimations().length, 0);
}, 'Triggering the cancel of an animation during event handling does not ' +
'crash.');
</script>
</head>
</html>