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

HTMLCanvasElement: transferControlToOffscreen() method - Web APIs

Baseline 2023

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The HTMLCanvasElement.transferControlToOffscreen() method transfers control to an OffscreenCanvas object, either on the main thread or on a worker.

transferControlToOffscreen()

None.

An OffscreenCanvas object.

InvalidStateError DOMException

Throws if:

• the canvas has been set a context mode by calling HTMLCanvasElement.getContext()
• the canvas has already transferred its control to offscreen.

The following example shows how to transfer control to an OffscreenCanvas object on the main thread.

const htmlCanvas = document.createElement("canvas");
const offscreen = htmlCanvas.transferControlToOffscreen();
const gl = offscreen.getContext("webgl");

// Some drawing using the gl context…

The following example shows how to transfer control to an OffscreenCanvas object on a worker.

const offscreen = document.querySelector("canvas").transferControlToOffscreen();
const worker = new Worker("my-worker-url.js");
worker.postMessage({ canvas: offscreen }, [offscreen]);

• The interface defining this method, HTMLCanvasElement
• OffscreenCanvas

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