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The WEBGL_lose_context extension is part of the WebGL API and exposes functions to simulate losing and restoring a WebGLRenderingContext.

WebGL extensions are available using the WebGLRenderingContext.getExtension() method. For more information, see also Using Extensions in the WebGL tutorial.

Availability: This extension is available to both, WebGL1 and WebGL2 contexts.


Simulates losing the context.
Simulates restoring the context.


With this extension, you can simulate the webglcontextlost and webglcontextrestored events:

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

canvas.addEventListener('webglcontextlost', (event) => {


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


Specification Status Comment
The definition of 'WEBGL_lose_context' in that specification.
Recommendation Initial definition.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome ? Edge Full support 17Firefox Full support 22
Full support 22
No support 19 — 58
Prefixed Implemented with the vendor prefix: MOZ_
IE ? Opera ? Safari ? WebView Android ? Chrome Android ? Edge Mobile No support NoFirefox Android ? Opera Android ? Safari iOS ? Samsung Internet Android ?


Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.

See also

Document Tags and Contributors

Contributors to this page: mdnwebdocs-bot, fscholz, jmstfv, nmve, teoli
Last updated by: mdnwebdocs-bot,