The read-only property MediaStreamTrack.id returns a DOMString containing a unique identifier (GUID) for the track; it is generated by the browser. Syntax var id = track.id; Example Specifications Specification Status Comment Media Capture and StreamsThe definition of 'MediaStreamTrack.id' in that specification. Editor's Draft Initial specification. Browser compatibility Desktop Mobile Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari Basic support (Yes) (Yes) No support (Yes) ? Feature Android Android Webview Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android Basic support ? (Yes) ? No support ? ? (Yes) See also WebRTC