The MediaStreamTrackEvent() constructor returns a newly created MediaStreamTrackEvent object, which represents an event announcing that a MediaStreamTrack has been added to or removed from a MediaStream.


var trackEvent = new MediaStreamTrackEvent(type, {track: aMediaStreamTrack});


The MediaStreamTrackEvent() constructor also inherits arguments from Event().

A DOMString representing the name of the type of the MediaStreamTrackEvent. It is case-sensitive and can be "addtrack" or "removetrack".
A MediaStreamTrack object representing the track which was added to or removed from the stream.

Return value

A new MediaStreamTrackEvent, initialized based on the provided options.


Specification Status Comment
Media Capture and Streams
The definition of 'MediaStreamTrackEvent()' in that specification.
Candidate Recommendation  

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 55.0 50 (50) No support 42 ?
Feature Android Android Webview Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support ? (Yes) 50.0 (50) No support 42 ? 55.0

See also

Document Tags and Contributors

 Contributors to this page: jpmedley, Sheppy
 Last updated by: jpmedley,