getContext3d method Null safety

@SupportedBrowser(SupportedBrowser.CHROME)
@SupportedBrowser(SupportedBrowser.FIREFOX)

RenderingContext getContext3d (

{dynamic alpha: true,
dynamic depth: true,
dynamic stencil: false,
dynamic antialias: true,
dynamic premultipliedAlpha: true,
dynamic preserveDrawingBuffer: false}

)

@SupportedBrowser(SupportedBrowser.CHROME), @SupportedBrowser(SupportedBrowser.FIREFOX)

Returns a new Web GL context for this canvas.

Other resources

WebGL fundamentals from HTML5Rocks.
WebGL homepage.

Implementation

@SupportedBrowser(SupportedBrowser.CHROME)
@SupportedBrowser(SupportedBrowser.FIREFOX)
gl.RenderingContext getContext3d(
    {alpha: true,
    depth: true,
    stencil: false,
    antialias: true,
    premultipliedAlpha: true,
    preserveDrawingBuffer: false}) {
  var options = {
    'alpha': alpha,
    'depth': depth,
    'stencil': stencil,
    'antialias': antialias,
    'premultipliedAlpha': premultipliedAlpha,
    'preserveDrawingBuffer': preserveDrawingBuffer,
  };
  var context = getContext('webgl', options);
  if (context == null) {
    context = getContext('experimental-webgl', options);
  }
  return context as gl.RenderingContext;
}