The getCapabilities() method of the MediaStreamTrack interface returns a MediaTrackCapabilities object which specifies the values or range of values which each constrianable property, based upon the platform and user agent.

Once you know what the browser's capabilities are, your script can use applyConstraints() to ask for the track to be configured to match ideal or acceptable settings. See "Capabilities and constraints" in Media Capture and Streams API (Media Streams) for details on how to work with constrainable properties.


var capabilities = MediaStreamTrack.getCapabilities();



Return value

MediaTrackCapabilities object which specifies the value or range of values which are supported for each of the user agent's supported constrainable properties.


Specification Status Comment
Media Capture and Streams
The definition of 'getConstraints()' in that specification.
Editor's Draft Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support No support No support ? ? ?
Feature Android Android Webview Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support No support No support ? ? ? No support

Document Tags and Contributors

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