web api instance property
MediaTrackSupportedConstraints: logicalSurface property
The MediaTrackSupportedConstraints dictionary’s logicalSurface property indicates whether or not the logicalSurface constraint is supported by the user agent and the device on which the content is being used.
The supported constraints list is obtained by calling navigator.mediaDevices.getSupportedConstraints().
Value
A boolean value which is true if the logicalSurface constraint is supported by the device and user agent.
Example
This method sets up the constraints object specifying the options for the call to
getDisplayMedia(). It adds the
logicalSurface constraint (requesting that only logical display
surfaces—those which may not be entirely visible onscreen—be included among the options
available to the user) only if it is known to be supported by the browser. Capturing is
then started by calling getDisplayMedia() and attaching the returned stream
to the video element referenced by the variable videoElem.
async function capture() {
const supportedConstraints = navigator.mediaDevices.getSupportedConstraints();
const displayMediaOptions = {
video: {},
audio: false,
};
if (supportedConstraints.logicalSurface) {
displayMediaOptions.video.logicalSurface = "monitor";
}
try {
videoElem.srcObject =
await navigator.mediaDevices.getDisplayMedia(displayMediaOptions);
} catch (err) {
/* handle the error */
}
}