Fixed Detector code. See #3871.

examples/js/Detector.js

@@ -6,7 +6,7 @@
 var Detector = {
 
 	canvas: !! window.CanvasRenderingContext2D,
-	webgl: ( function () { try { var canvas = document.createElement( 'canvas' ); return !! window.WebGLRenderingContext && !! canvas.getContext( 'webgl' ) && !! canvas.getContext( 'experimental-webgl' ); } catch( e ) { return false; } } )(),
+	webgl: ( function () { try { var canvas = document.createElement( 'canvas' ); return !! window.WebGLRenderingContext && ( canvas.getContext( 'webgl' ) || canvas.getContext( 'experimental-webgl' ) ); } catch( e ) { return false; } } )(),
 	workers: !! window.Worker,
 	fileapi: window.File && window.FileReader && window.FileList && window.Blob,
 
@@ -56,4 +56,4 @@ var Detector = {
 
 	}
 
-};
+};
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