This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage 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 specification changes.

The OffscreenCanvas() constructor returns a newly instantiated OffscreenCanvas object.


new OffscreenCanvas(width, height);


The height of the offscreen canvas.
The width of the offscreen canvas.


Creating a new offscreen canvas and initializing a WebGL context on it:

var offscreen = new OffscreenCanvas(256, 256);
var gl = offscreen.getContext("webgl");


Specification Status Comment
WHATWG HTML Living Standard
The definition of 'OffscreenCanvas()' in that specification.
Living Standard  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support No support 46 (46) [1] No support No support No support
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support 46.0 (46) [1] No support No support No support

[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: adria, fscholz
 Last updated by: adria,