HTMLCanvasElement: webglcontextlost event

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.

This event does not bubble.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

js
addEventListener("webglcontextlost", (event) => { })

onwebglcontextlost = (event) => { }

Event type

A WebGLContextEvent. Inherits from Event.

EventWebGLContextEvent

Example

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

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

canvas.addEventListener("webglcontextlost", (event) => {
  console.log(event);
});

gl.getExtension("WEBGL_lose_context").loseContext();

// "webglcontextlost" event is logged.

Specifications

See also