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Test Info:
<!DOCTYPE html>
<html class="reftest-wait">
<title>
Changing target to an element that does not override opacity animations
creates a stacking context even if the animation is delay phase
</title>
<style>
span {
height: 100px;
width: 100px;
position: fixed;
background: green;
top: 50px;
}
#first {
width: 100px; height: 100px;
background: blue;
opacity: 1 ! important;
}
#second {
width: 100px; height: 100px;
background: blue;
}
</style>
<span></span>
<div id="first"></div>
<div id="second"></div>
<script>
var anim = document.getElementById("first")
.animate({ opacity: [0, 1] },
{ delay: 100000, duration: 100000 });
anim.ready.then(function() {
anim.effect.target = document.getElementById("second");
document.documentElement.classList.remove("reftest-wait");
});
</script>