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<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="UTF-8">
<title>Update playback rate zero</title>
<link rel="match" href="update-playback-rate-fast-ref.html">
<script src="/common/reftest-wait.js"></script>
<script src="../../testcommon.js"></script>
<style>
#box {
background: green;
height: 40px;
width: 40px;
}
</style>
<body>
<div id="box"></div>
<p id="notes">
This test creates a running animation and changes its playback rate
part way through. If the box remains red when the screenshot is captured
the test fails.
</p>
</body>
<script>
onload = async function() {
const box = document.getElementById('box');
const duration = 2000;
const anim =
box.animate({ bacground: [ 'red', 'green' ] },
{ duration: duration, easing: 'steps(2, jump-none)' });
anim.ready.then(() => {
const startTime = anim.timeline.currentTime;
waitForAnimationFrames(2).then(() => {
anim.updatePlaybackRate(2);
anim.ready.then(() => {
const updateTime = anim.timeline.currentTime;
const baseProgress = (updateTime - startTime) / duration;
const checkIfDone = () => {
const progress =
2 * (anim.timeline.currentTime - updateTime) / duration +
baseProgress;
if (progress > 0.5)
takeScreenshot();
else
requestAnimationFrame(checkIfDone);
};
requestAnimationFrame(checkIfDone);
});
});
});
};
</script>
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