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Test Info:
<!DOCTYPE html>
<html class="reftest-wait">
<title>
Changing keyframes to opacity frames creates a stacking context even if the
animation is delay phase
</title>
<style>
span {
height: 100px;
width: 100px;
position: fixed;
background: green;
top: 50px;
}
#test {
width: 100px; height: 100px;
background: blue;
}
</style>
<span></span>
<div id="test"></div>
<script>
var anim = document.getElementById("test")
.animate({ width: ['100px', '100px'] },
{ delay: 100000, duration: 100000 });
anim.ready.then(function() {
anim.effect.setKeyframes({ opacity: [0, 1] });
document.documentElement.classList.remove("reftest-wait");
});
</script>