 premultipliedAlpha: true,
    preserveDrawingBuffer: false}) {
  var options = {
    &#39;alpha&#39;: alpha,
    &#39;depth&#39;: depth,
    &#39;stencil&#39;: stencil,
    &#39;antialias&#39;: antialias,
    &#39;premultipliedAlpha&#39;: premultipliedAlpha,
    &#39;preserveDrawingBuffer&#39;: preserveDrawingBuffer,
  };
  var context = getContext(&#39;webgl&#39;, options);
  if (context == null) {
    context = getContext(&#39;experimental-webgl&#39;, options);
  }
  return context;
}</code></pre>
    </