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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style>
div {
width: 100px;
height: 100px;
background-color: blue;
}
</style>
<script>
window.onload = function(){
if (typeof Object.getOwnPropertyDescriptor(window.Animation.prototype,
'timeline').set == 'undefined') {
return;
}
let body = document.getElementsByTagName("body")[0];
let target = document.createElement("div");
let anim1 = new Animation();
let anim2 = new Animation();
let effect = new KeyframeEffect(target, { opacity: [ 0, 1 ] }, 1000);
body.appendChild(target);
anim1.startTime = 88;
anim1.timeline = null;
anim1.pause();
anim1.effect = effect;
anim2.effect = effect;
anim1.effect = effect;
// Put another opacity animation on the top of the effect stack so that we
// try to send a lower priority animation that has no timeline to the
// compositor.
let anim3 = target.animate({ opacity : [ 1, 0 ] }, 1000);
Promise.all([anim1.ready, anim2.ready, anim2.ready]).then(function() {
document.documentElement.classList.remove("reftest-wait");
});
};
</script>
</head>
<body></body>
</html>
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