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

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support55 ?50 No42 ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support5555 ?5042 ?6.0

See also

Document Tags and Contributors

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