logicalSurface property is a
ConstrainDOMString describing the requested or mandatory constraints placed upon the value of the
logicalSurface constrainable property.
This is used to specify whether or
getDisplayMedia() should allow the
user to choose display surfaces which are not necessarily fully visible on the screen,
such as occluded windows or the complete content of windows which are large enough to
require scrolling to see their entire contents.
If needed, you can determine whether or not this constraint is supported by checking
the value of
MediaTrackSupportedConstraints.logicalSurface as returned by
a call to
MediaDevices.getSupportedConstraints(). However, typically this
is unnecessary since browsers will ignore any constraints they're unfamiliar with.
You can check the setting selected by the user agent after the display media has been
getDisplayMedia() by calling
getSettings() on the display media's
MediaStreamTrack, then checking the value of the returned
For example, if your app needs to know if the selected display surface is a logical one:
let isLogicalSurface = displayStream .getVideoTracks() .getSettings().logicalSurface;
Following this code,
true if the display
surface contained in the stream is a logical surface; that is, one which may not be
entirely onscreen, or may even be entirely offscreen.
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