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Test Info:
<!doctype html>
<html>
<head>
<script>
window.addEventListener('load', async () => {
const element = document.getElementById('target');
element.animate({
'all': ['initial']
}, {
'duration': 500,
'pseudoElement': '::marker',
})
element.hidden = false;
})
</script>
</head>
<ul>
<li id='target' hidden></li>
</ul>
</html>