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Test Info:
<!DOCTYPE html>
<html class="reftest-wait reftest-no-flush">
<!--
reftest-no-flush above is necessary to make invalidation changes happen.
Without it, reftest harness takes the snapshot on the next frame after the
frame that a paint for appending the element happened.
-->
<title>Transform animation whose target is not initially associated with any document creates a stacking context even if it has only 'transform:none' in its keyframe</title>
<style>
span {
height: 100px;
width: 100px;
position: fixed;
background: green;
top: 50px;
}
div {
width: 100px; height: 100px;
background: blue;
}
</style>
<span></span>
<script>
var div = document.createElement("div")
var anim = div.animate({ transform: ['none', 'none'] },
{ duration: 100000 });
anim.ready.then(() => {
document.body.appendChild(div);
document.documentElement.classList.remove("reftest-wait");
});
</script>