Use the newer element.webkitRequestFullscreen method if available, to support all key events in fullscreen mode.

js/reveal.js

@@ -958,6 +958,7 @@ var Reveal = (function(){
 
 		// Check which implementation is available
 		var requestMethod = element.requestFullScreen ||
+							element.webkitRequestFullscreen ||
 							element.webkitRequestFullScreen ||
 							element.mozRequestFullScreen ||
 							element.msRequestFullScreen;