WebGLRenderingContext: getContextAttributes() method

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

Syntax

getContextAttributes()

Parameters

None.

Return value

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

Examples

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.

Specifications

Browser compatibility

See also

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