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Test Info:

<html class="reftest-wait">
<head>
<script>
function start () {
const audio = document.getElementById('id_4')
const doc = new Document()
const stream = new MediaStream()
const track = document.createElementNS('http://www.w3.org/1999/xhtml', 'track')
audio.srcObject = stream
track.textContent = '�'
setTimeout(() => {
track.replaceChild(audio, track.childNodes[0])
audio.play().then(function (arg4) { })
document.documentElement.removeAttribute("class")
}, 157)
doc.adoptNode(audio)
}
document.addEventListener('DOMContentLoaded', start)
</script>
</head>
<audio class="" id="id_4" itemscope></audio>
</html>