The webglcontextlost event of the WebGL API is fired if the user agent detects that the drawing buffer associated with a WebGLRenderingContext object has been lost.

Bubbles Yes
Cancelable Yes
Target objects HTMLCanvasElement
Interface WebGLContextEvent


With the help of the WEBGL_lose_context extension, you can simulate the webglcontextlost event:

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

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


// "webglcontextlost" event is logged.


The webglcontextlost event implements the WebGLContextEvent interface, which inherits from Event. You can use the properties and methods defined on these interfaces.


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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 9 4.0 (2.0) 11 12 5.1
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? 25 4.0 (2.0) ? 12 8.0

See also

Document Tags and Contributors

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