WebGLRenderingContext.getContextAttributes()

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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.

Syntax

gl.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, 
  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

Specification Status Comment
WebGL 1.0
The definition of 'WebGLRenderingContext.getContextAttributes' in that specification.
Recommendation Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
getContextAttributesChrome Full support 9Edge Full support 12Firefox Full support 4IE Full support 11Opera Full support 12Safari Full support 5.1WebView Android Full support YesChrome Android Full support 25Firefox Android Full support YesOpera Android Full support 12Safari iOS Full support 8Samsung Internet Android Full support Yes

Legend

Full support  
Full support

See also