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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
loseContextChrome Full support YesEdge Full support 17Firefox Full support 22
Full support 22
No support 19 — 58
Prefixed Implemented with the vendor prefix: MOZ_
IE ? Opera Full support YesSafari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile No support NoFirefox Android ? Opera Android Full support YesSafari iOS ? Samsung Internet Android Full support Yes


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,