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CropTarget
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The CropTarget interface of the Screen Capture API provides a static method, fromElement(), which returns a CropTarget instance that can be used to crop a captured video track to the area in which a specified element is rendered.
fromElement() -
Returns a CropTarget instance that can be used to crop a captured video track to the area in which a specified element is rendered.
js
// Options for getDisplayMedia()
const displayMediaOptions = {
preferCurrentTab: true,
};
// Create crop target from DOM element
const demoElem = document.querySelector("#demo");
const cropTarget = await CropTarget.fromElement(demoElem);
// Capture video stream from user's webcam and isolate video track
const stream =
await navigator.mediaDevices.getDisplayMedia(displayMediaOptions);
const [track] = stream.getVideoTracks();
// Crop video track
await track.cropTo(cropTarget);
// Broadcast cropped stream in <video> element
videoElem.srcObject = stream;
See Using the Element Capture and Region Capture APIs for in-context example code.