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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/RestrictionTarget below:

RestrictionTarget - Web APIs | MDN

Limited availability

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The RestrictionTarget interface of the Screen Capture API provides a static method, fromElement(), which returns a RestrictionTarget instance that can be used to restrict a captured video track to a specified DOM element.

fromElement() Experimental

Returns a RestrictionTarget instance that can be used to restrict a captured video track to a specified DOM element (plus its descendants).

// Options for getDisplayMedia()
const displayMediaOptions = {
  preferCurrentTab: true,
};

// Create restriction target from DOM element
const demoElem = document.querySelector("#demo");
const restrictionTarget = await RestrictionTarget.fromElement(demoElem);

// Capture video stream from user's webcam and isolate video track
const stream =
  await navigator.mediaDevices.getDisplayMedia(displayMediaOptions);
const [track] = stream.getVideoTracks();

// Restrict video track
await track.restrictTo(restrictionTarget);

// Broadcast restricted stream in <video> element
videoElem.srcObject = stream;

See Using the Element Capture and Region Capture APIs for in-context example code.

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