The MediaTrackSupportedConstraints dictionary establishes the list of constrainable properties recognized by the
user agent or browser in its implementation of the MediaStreamTrack object. An object conforming to
MediaTrackSupportedConstraints is returned by MediaDevices.getSupportedConstraints().
The MediaTrackSupportedConstraints dictionary establishes the list of constrainable properties recognized by the user agent or browser in its implementation of the MediaStreamTrack object. An object conforming to MediaTrackSupportedConstraints is returned by MediaDevices.getSupportedConstraints().