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+<html class="reftest-wait">
+<title>Worklet Animation sets keyframes</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
+<meta name="assert" content="Can update the keyframes for an effect while the animation is running">
+<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 keyframes_before = [
+ { transform: 'translateX(0)' },
+ { transform: 'translateX(200px)' }
+ ];
+ const keyframes_after = [
+ { transform: 'translateY(0)' },
+ { transform: 'translateY(200px)' }
+ ];
+
+ const box = document.getElementById('box');
+ const effect = new KeyframeEffect(box, keyframes_before, {duration: 1000});
+ const animation = new WorkletAnimation('constant_time', effect);
+ animation.play();
+
+ waitForAsyncAnimationFrames(1).then(_ => {
+ effect.setKeyframes(keyframes_after);
+ waitForAsyncAnimationFrames(1).then(_ => {
+ takeScreenshot();
+ });
+ });
+ });
+</script> \ No newline at end of file