MediaStream() constructor returns a newly-created
MediaStream, which serves as a collection of media tracks, each represented by a
If any parameters are given, the specified tracks are added to the new stream.
Otherwise, the stream has no tracks.
MediaStream object whose tracks are added to the
newly-created stream automatically. The tracks are not removed from the original
stream, so they're shared by the two streams.
MediaStreamTrack objects, one for each
track to add to the stream.
MediaStream object, either empty, or containing the
tracks provided, if any.
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