Web/API/HTMLCanvasElement/webglcontextrestored event

The webglcontextrestored event of the WebGL API is fired if the user agent restores the drawing buffer for a WebGLRenderingContext object.

Once the context is restored, WebGL resources such as textures and buffers that were created before the context was lost are no longer valid. You need to reinitialize the state of your WebGL application and recreate resources.

Bubbles	Yes
Cancelable	Yes
Interface	WebGLContextEvent
Event handler property	none

Example

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

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

canvas.addEventListener('webglcontextrestored', function(e) {
  console.log(e); 
}, false);

gl.getExtension('WEBGL_lose_context').restoreContext();

// "webglcontextrestored" event is logged.

Specifications

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

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
webglcontextrestored event	Chrome Full support 9	Edge Full support 12	Firefox Full support 4	IE Full support 11	Opera Full support 12	Safari Full support 5.1	WebView Android Full support Yes	Chrome Android Full support 25	Firefox Android Full support 4	Opera Android Full support 12	Safari iOS Full support 8	Samsung Internet Android Full support 1.5

Legend

Full support  

Full support

See also

• WebGLContextEvent
• WebGLRenderingContext.isContextLost()
• WEBGL_lose_context, WEBGL_lose_context.loseContext(), WEBGL_lose_context.restoreContext()

HTMLCanvasElement: webglcontextrestored event by Mozilla Contributors is licensed under CC-BY-SA 2.5.