This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.

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


OffscreenCanvas HTMLCanvasElement.transferControlToOffscreen()

Return value

An OffscreenCanvas object.


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

// ... some drawing using the gl context ...

// Push frames back to the original HTMLCanvasElement


Currently drafted as a proposal in the OffscreenCanvas specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support Not supported 44 (44) [1] Not supported Not supported Not supported
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support Not supported 44.0 (44) [1] Not supported Not supported Not supported

[1] This feature is behind a feature preference setting. In about:config, set gfx.offscreencanvas.enabled to true.

See also

Document Tags and Contributors

 Contributors to this page: fscholz
 Last updated by: fscholz,