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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/HTMLCanvasElement/webglcontextlost_event below:

HTMLCanvasElement: webglcontextlost event - Web APIs

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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.

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

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

onwebglcontextlost = (event) => { }

This interface inherits properties from its parent interface, Event.

WebGLContextEvent.statusMessage

A read-only property containing additional information about the event.

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

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.

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