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Test Info:
<html class="reftest-wait">
<head>
<script>
(async _ => {
try {
const video = document.createElement('video')
video.preload = 'metadata'
video.src = 'sound.ogg'
await new Promise(r => video.onloadedmetadata = r)
const stream_1 = video.mozCaptureStreamUntilEnded()
video.src = ''
const stream_2 = video.mozCaptureStreamUntilEnded()
} finally {
document.documentElement.removeAttribute("class")
}
})()
</script>
</head>
</html>