The clone() method of the Request interface creates a copy of the current Request object.
The clone() method of the Response interface creates a clone of a response object, identical in every way, but stored in a different variable.
The clone() method of the MediaStream interface creates a duplicate of the MediaStream. This new MediaStream object has a new unique id and contains clones of every MediaStreamTrack contained by the MediaStream on which clone() was called.
The clone() method of the MediaStreamTrack interface creates a duplicate of the MediaStreamTrack. This new MediaStreamTrack object is identical except for its unique id.