Full Test for WebGL Support

webgl_support.js

function webgl_support() { 
   try{
    var canvas = document.createElement( 'canvas' ); 
    return !! window.WebGLRenderingContext && ( 
         canvas.getContext( 'webgl' ) || canvas.getContext( 'experimental-webgl' ) );
   }catch( e ) { return false; } 
 };