The RTCRtpStreamStats dictionary's transportId property is a string which uniquely identifies the object from which the statistics contained in the RTCTransportStats properties in the RTCStatsReport. 
 The RTCRtpStreamStats dictionary's transportId property is a string which uniquely identifies the object from which the statistics contained in the RTCTransportStats properties in the RTCStatsReport. 
 A string uniquely identifying the source of the statistics contained the RTCTransportStats properties in the RTCStatsReport. 
No specification data found for api.RTCRtpStreamStats.transportId.
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    https://developer.mozilla.org/en-US/docs/Web/API/RTCRtpStreamStats/transportId