OffscreenCanvasRenderingContext2D: commit() method

Note: This feature is available in Web Workers.

Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The OffscreenCanvasRenderingContext2D.commit() method of the Canvas 2D API was intended to copy the rendering context's bitmap to the bitmap of the placeholder <canvas> element of the associated OffscreenCanvas object. The copy operation is synchronous. Calling this method is not needed for the transfer, since it happens automatically during the event-loop execution.




const placeholder = document.createElement("canvas");
const offscreen = placeholder.transferControlToOffscreen();
const ctx = offscreenCanvas.getContext("2d");

// Perform some drawing using the 2d context
ctx.fillStyle = "blue";
ctx.fillRect(0, 0, 10, 10);

// Push placeholder to the canvas element


Not part of any specification.

Browser compatibility

BCD tables only load in the browser

See also