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Test Info:

<!DOCTYPE html>
<html class="reftest-wait reftest-no-flush">
<title>
Transform animation creates a stacking context when changing its target
</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>
<div id="another"></div>
<script>
var anim = document.getElementById("test")
.animate({ transform: ['none', 'none'] }, { duration: 100000 });
anim.ready.then(function() {
anim.effect.target = document.getElementById("another");
requestAnimationFrame(function() {
document.documentElement.classList.remove("reftest-wait");
});
});
</script>