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.

• HTMLCanvasElement.getContext()
• CanvasRenderingContext2D.getContextAttributes()