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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<title>Validates rendering of an animated element with jump-start in the before phase</title>
<link rel="help" href="https://www.w3.org/TR/css-animations-1">
<link rel="match" href="jump-start-animation-before-phase-ref.html">
<style type="text/css" media="screen">
body {
margin: 0;
}
@keyframes slide {
from { transform: translateX(100px); }
to { transform: translateX(200px); }
}
#target {
background-color: green;
height: 100px;
width: 100px;
margin: 0;
animation: slide 10000s 5000s steps(1, jump-start) backwards;
}
</style>
<body>
<div id="target"></div>
</body>
<script src="/common/reftest-wait.js"></script>
<script src="support/testcommon.js"></script>
<script type="text/javascript">
window.onload = async () => {
await document.getAnimations()[0].ready;
await waitForNextFrame();
takeScreenshot();
}
</script>