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<html class="reftest-wait">
<title>Animation Worklet local time set before start</title>
<link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
<meta name="assert" content="The local time should be trimmed by the duration, e.g. this is equivalent to effect.localTime = 0">
<link rel="match" href="references/translated-box-ref.html">
<script src="/web-animations/testcommon.js"></script>
<script src="/common/reftest-wait.js"></script>
<script src="common.js"></script>
<style>
#box {
width: 100px;
height: 100px;
background-color: green;
}
</style>
<div id="box"></div>
<script>
registerConstantLocalTimeAnimator(-500).then(() => {
const box = document.getElementById('box');
const effect = new KeyframeEffect(box,
[
{ transform: 'translateY(100px)' },
{ transform: 'translateY(0px)' }
], {
duration: 1000,
fill: 'backwards'
}
);
const animation = new WorkletAnimation('constant_time', effect);
animation.play();
waitForAsyncAnimationFrames(1).then(_ => {
takeScreenshot();
});
});
</script>
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