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Test Info:

<html class="reftest-wait">
<head>
<script>
function finish() {
document.documentElement.className = "";
}
window.addEventListener('load', () => {
const video = document.createElementNS('http://www.w3.org/1999/xhtml', 'video')
document.documentElement.appendChild(video)
setTimeout(async () => { video.poster = '1677518-1.jpg'; setTimeout(finish, 500); }, 165 )
video.setAttribute('poster', '1677518-1.svg')
})
</script>
</head>
</html>