See Capabilities, constraints, and settings for details on how to work with constrainable properties.
MediaTrackSettings object describing the current configuration of the
track's constrainable properties.
Note: The returned object identifies the current values of every
constrainable property, including those which are platform defaults rather than having
been expressly set by the site's code. To instead fetch the most-recently established
constraints for the track's properties, as specified by the site's code, use
|Media Capture and Streams
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