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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/getContextAttributes below:

WebGLRenderingContext: getContextAttributes() method - Web APIs

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The WebGLRenderingContext.getContextAttributes() method returns a WebGLContextAttributes object that contains the actual context parameters. Might return null, if the context is lost.

None.

A WebGLContextAttributes object that contains the actual context parameters, or null if the context is lost.

Given this <canvas> element

<canvas id="canvas"></canvas>

and given this WebGL context

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

the getContextAttributes method returns an object that describes the attributes set on this context, for example:

{
  "alpha": true,
  "antialias": true,
  "depth": true,
  "failIfMajorPerformanceCaveat": false,
  "powerPreference": "default",
  "premultipliedAlpha": true,
  "preserveDrawingBuffer": false,
  "stencil": false,
  "desynchronized": false
}

The context attributes can be set when creating the context using the HTMLCanvasElement.getContext() method:

canvas.getContext("webgl", { antialias: false, depth: false });

See getContext() for more information about the individual attributes.

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