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		| @@ -615,16 +615,21 @@ var Reveal = (function(){ | |||||||
|  |  | ||||||
| 		if( config.focusBodyOnPageVisiblityChange ) { | 		if( config.focusBodyOnPageVisiblityChange ) { | ||||||
| 			var visibilityChange; | 			var visibilityChange; | ||||||
|  |  | ||||||
| 			if( 'hidden' in document ) { | 			if( 'hidden' in document ) { | ||||||
| 				visibilityChange = 'visibilitychange'; | 				visibilityChange = 'visibilitychange'; | ||||||
| 			} else if ('msHidden' in document) { | 			} | ||||||
|  | 			else if( 'msHidden' in document ) { | ||||||
| 				visibilityChange = 'msvisibilitychange'; | 				visibilityChange = 'msvisibilitychange'; | ||||||
| 			} else if ('webkitHidden' in document) { | 			} | ||||||
|  | 			else if( 'webkitHidden' in document ) { | ||||||
| 				visibilityChange = 'webkitvisibilitychange'; | 				visibilityChange = 'webkitvisibilitychange'; | ||||||
| 			} | 			} | ||||||
|  |  | ||||||
|  | 			if( visibilityChange ) { | ||||||
| 				document.addEventListener( visibilityChange, onPageVisibilityChange, false ); | 				document.addEventListener( visibilityChange, onPageVisibilityChange, false ); | ||||||
| 			} | 			} | ||||||
|  | 		} | ||||||
|  |  | ||||||
| 		[ 'touchstart', 'click' ].forEach( function( eventName ) { | 		[ 'touchstart', 'click' ].forEach( function( eventName ) { | ||||||
| 			dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } ); | 			dom.controlsLeft.forEach( function( el ) { el.addEventListener( eventName, onNavigateLeftClicked, false ); } ); | ||||||
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