files/en-us/web/api/browsercapturemediastreamtrack/clone/index.md
{{APIRef("Screen Capture API")}}{{SeeCompatTable}}{{securecontext_header}}
The clone() method of the {{domxref("BrowserCaptureMediaStreamTrack")}} interface returns a clone of the original BrowserCaptureMediaStreamTrack.
This method is functionally identical to {{domxref("MediaStreamTrack.clone()")}}, except that it handles cases where cropping or restriction have been applied to the track. The returned clone is identical to the original BrowserCaptureMediaStreamTrack, but with any cropping or restriction removed.
[!NOTE] In Chromium, if a track has clones, its {{domxref("BrowserCaptureMediaStreamTrack.cropTo", "cropTo()")}} and {{domxref("BrowserCaptureMediaStreamTrack.restrictTo", "restrictTo()")}} methods will reject (see Chrome issue 41482026).
clone()
None.
A {{domxref("BrowserCaptureMediaStreamTrack")}} instance.
// 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);
// Create uncropped clone of the track
const clonedTrack = track.clone();
{{Specifications}}
{{Compat}}