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@@ -2645,12 +2645,15 @@ var Reveal = (function(){
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}
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+ /**
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+ * Returns the slide element matching the specified index.
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+ */
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function getSlide( x, y ) {
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var horizontalSlide = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
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var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );
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- if( typeof y === 'number' ) {
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+ if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
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return verticalSlides ? verticalSlides[ y ] : undefined;
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}
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@@ -2669,7 +2672,7 @@ var Reveal = (function(){
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var horizontalBackground = document.querySelectorAll( '.backgrounds>.slide-background' )[ x ];
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var verticalBackgrounds = horizontalBackground && horizontalBackground.querySelectorAll( '.slide-background' );
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- if( typeof y === 'number' ) {
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+ if( verticalBackgrounds && verticalBackgrounds.length && typeof y === 'number' ) {
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return verticalBackgrounds ? verticalBackgrounds[ y ] : undefined;
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}
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