The WebContextEvent interface is part of the WebGL API and is an interface for an event that is generated in response to a status change to the WebGL rendering context.


This interface inherits properties and methods from its parent interface, Event.


This interface inherits properties from its parent interface, Event.

A read-only property containing additional information about the event.


This interface doesn't define any own methods, but inherits methods from its parent interface, Event.


With the help of the WEBGL_lose_context extension, you can simulate the webglcontextlost and webglcontextrestored events:

var canvas = document.getElementById("canvas");
var gl = canvas.getContext("webgl");

canvas.addEventListener("webglcontextlost", function(e) {
}, false);


// WebGLContextEvent event with type "webglcontextlost" is logged.


Specification Status Comment
WebGL 1.0
The definition of 'WebGLContextEvent' in that specification.
Recommendation Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 9 49 (49) 11 12 5.1
Available in workers No support 49 (49) [1] No support No support No support
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? 25 49.0 (49) ? 12 8.1
Available in workers No support No support 49.0 (49) [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: fscholz
 Last updated by: fscholz,