selected controls whether or not a particular video
track is active.
isVideoSelected = VideoTrack.selected; VideoTrack.selected = true | false;
selected property is a Boolean whose value is
true if the
track is active. Only a single video track can be active at any given time, so setting
this property to
true for one track while another track is active will make
that other track inactive.
|HTML Living Standard
The definition of 'VideoTrack: selected' in that specification.
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