var mediaStreamTrack = rtcRtpSender.track
MediaStreamTrack object representing the media associated with the
RTCRtpSender. If no track is associated with the sender, this value is
null, in which case the sender transmits nothing.
|WebRTC 1.0: Real-time Communication Between Browsers
The definition of 'track' in that specification.
|Candidate Recommendation||Initial definition.|
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