Abstract
Readonly
kindOptional
sidindicates current state of stream, it'll indicate paused
if the track
has been paused by congestion controller
current receive bits per second
creates a new HTMLAudioElement or HTMLVideoElement, attaches to it, and returns it
attaches track to an existing HTMLAudioElement or HTMLVideoElement
Abstract
start
sid is set after track is published to server, or if it's a remote track