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Test Info:

<!doctype html>
<html class="reftest-wait">
<div id="test" contenteditable>
<div id="first"></div>
</div>
<script>
document.body.offsetTop;
let anim = document.createElement('div');
anim.animate({ color: ['red', 'green' ] }, 1000);
first.appendChild(anim);
let child = document.createElement('span');
child.innerText = 'text';
requestAnimationFrame(() => {
requestAnimationFrame(() => {
anim.appendChild(child);
test.appendChild(anim);
document.documentElement.className = "";
});
});
</script>
</html>