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<!DOCTYPE html>
<html class="reftest-wait reftest-no-flush">
<title>
Opacity animation creates a stacking context after changing effects
</title>
<style>
span {
height: 100px;
width: 100px;
position: fixed;
background: green;
top: 50px;
}
div {
width: 100px;
height: 100px;
background: blue;
}
</style>
<span></span>
<div id="test"></div>
<script>
var elem = document.getElementById("test");
var anim = elem.animate(null, { duration: 100000 });
var newEffect = new KeyframeEffect(elem, { opacity: [1, 1] }, 100000);
anim.ready.then(function() {
anim.effect = newEffect;
requestAnimationFrame(function() {
document.documentElement.classList.remove("reftest-wait");
});
});
</script>
</html>
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