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Test Info:
<!DOCTYPE html>
<title>
CSS opacity animation winning over web animation in delay phase creates
a stacking context
</title>
<style>
span {
height: 100px;
width: 100px;
position: fixed;
background: green;
top: 50px;
}
@keyframes Opacity1 {
from, to { opacity: 1; }
}
#test {
width: 100px; height: 100px;
background: blue;
animation: Opacity1 100s;
}
</style>
<span></span>
<div id="test"></div>
<script>
document.getElementById("test")
.animate({ opacity: [0.1, 0.1] }, { duration: 100000, delay: 100000 });
requestAnimationFrame(function() {
document.documentElement.classList.remove("reftest-wait");
});
</script>