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Test Info:
<html class="reftest-wait">
<head>
<script>
async function boom() {
const audio = document.createElement("audio");
audio.preload = "metadata";
audio.src = "sound.ogg";
await new Promise(r => audio.onloadedmetadata = r);
const s = audio.mozCaptureStream();
const recorder = new MediaRecorder(
new MediaStream(s.getTracks()),
{ audioBitsPerSecond: 3994678619 }
);
recorder.start();
document.documentElement.removeAttribute("class");
}
</script>
</head>
<body onload="boom()">
</body>
</html>