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 width property returns and sets the width of an OffscreenCanvas object.


var pxl = offscreen.width;
offscreen.width = pxl;


Creating a new offscreen canvas and returning or setting the width of the offscreen canvas:

var offscreen = new OffscreenCanvas(256, 256);
offscreen.width; // 256
offscreen.width = 512;


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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support No support 44 (44) [1] No support No support No support
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support 44.0 (44) [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,