WebGLRenderingContext.getContextAttributes()

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

Syntax

<var>gl</var>.getContextAttributes();

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

var canvas = document.getElementById("canvas");
var 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, 
  premultipliedAlpha: true, 
  preserveDrawingBuffer: false, 
  stencil: 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

• WebGLRenderingContext