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Test Info:

<html>
<head>
<script>
function start () {
const frame = document.createElementNS('http://www.w3.org/1999/xhtml', 'frame')
document.documentElement.appendChild(frame)
frame.contentWindow.eval('window.top.context=new AudioContext()')
document.documentElement.innerHTML = ''
context.createMediaElementSource(new Audio(''))
}
document.addEventListener('DOMContentLoaded', start)
</script>
</head>
</html>