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Test Info:

<!DOCTYPE html>
<html class="reftest-wait reftest-no-flush">
<title>Bug 1383239</title>
<style>
div {
position: absolute;
left: -9999px;
background: orange;
width: 20px;
height: 20px;
animation: anim 100s 0.1s infinite;
}
@keyframes anim {
0% {
left: 0px;
}
100% {
left: 0px;
}
}
</style>
<div></div>
<script>
document.querySelector('div').addEventListener('animationstart', ()=> {
document.documentElement.classList.remove('reftest-wait');
});
</script>
</html>