<html>
<head>
    <script>
      window.addEventListener('load', async () => {
        const peer = new RTCPeerConnection({})
        await peer.createOffer({ 'offerToReceiveVideo': true })
        const receivers = peer.getReceivers()
        const sender = peer.addTrack(receivers[0].track)
        peer.close()
        await sender.getStats()
        await sender.replaceTrack(receivers[0].track)
      })
    </script>
</head>
</html>
