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<html>
<head>
<script>
window.addEventListener('load', async () => {
const frame = document.createElement('frame')
document.documentElement.appendChild(frame)
const pc = new RTCPeerConnection({})
await pc.createOffer({ 'offerToReceiveAudio': true })
const [{receiver}] = pc.getTransceivers()
const track = pc.addTrack(receiver.track)
pc.removeTrack(track)
const [track2] = (await frame.contentWindow.navigator.mediaDevices.getUserMedia({
'audio': {},
'fake': true
})).getTracks()
pc.addTrack(track2)
})
</script>
</head>
</html>
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