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 non-standard and internal only CanvasRenderingContext2D.drawWidgetAsOnScreen() method of the Canvas 2D API renders the root widget of a window into the canvas. Unlike drawWindow(), this API uses the operating system to snapshot the widget on-screen, rather than reading from Gecko's own compositor.

This API cannot be used by Web content. It is only supported on Windows, only on widgets that use OMTC, and only from within the chrome process.


void <var>ctx.</var>drawWidgetAsOnScreen<var>(window);</var>


The Window to render.


Not part of any current specification or draft. This is a non-standard and internal only API.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support Not supported 41 (41) Not supported Not supported Not supported
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support Not supported Not supported 41.0 (41) Not supported Not supported Not supported

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API Canvas CanvasRenderingContext2D Method Reference