diff --git a/js/reveal.js b/js/reveal.js index 600a7634..e6368d6d 100644 --- a/js/reveal.js +++ b/js/reveal.js @@ -615,15 +615,20 @@ var Reveal = (function(){ if( config.focusBodyOnPageVisiblityChange ) { var visibilityChange; - if ('hidden' in document) { + + if( 'hidden' in document ) { visibilityChange = 'visibilitychange'; - } else if ('msHidden' in document) { + } + else if( 'msHidden' in document ) { visibilityChange = 'msvisibilitychange'; - } else if ('webkitHidden' in document) { + } + else if( 'webkitHidden' in document ) { visibilityChange = 'webkitvisibilitychange'; } - document.addEventListener(visibilityChange, onPageVisibilityChange, false); + if( visibilityChange ) { + document.addEventListener( visibilityChange, onPageVisibilityChange, false ); + } } [ 'touchstart', 'click' ].forEach( function( eventName ) { diff --git a/js/reveal.min.js b/js/reveal.min.js index 2463ef9f..b400f6d3 100644 --- a/js/reveal.min.js +++ b/js/reveal.min.js @@ -1,8 +1,8 @@ /*! - * reveal.js 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