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				@@ -3,7 +3,9 @@ 
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				 	var isEnabled = true; 
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				 	document.querySelector( '.reveal' ).addEventListener( 'mousedown', function( event ) { 
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				-		if( event.altKey && isEnabled ) { 
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				+		var modifier = ( Reveal.getConfig().zoomKey ? Reveal.getConfig().zoomKey : 'alt' ) + 'Key'; 
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				+ 
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				+		if( event[ modifier ] && isEnabled ) { 
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				 			event.preventDefault(); 
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				 			zoom.to({ element: event.target, pan: false }); 
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				 		} 
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