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prevent double-initialization #3696
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@@ -130,6 +130,8 @@ export default function( revealElement, options ) {
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if( !revealElement ) throw 'Unable to find presentation root (<div class="reveal">).';
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if( !revealElement ) throw 'Unable to find presentation root (<div class="reveal">).';
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if( initialized ) throw 'Reveal.js has already been initialized.';
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initialized = true;
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initialized = true;
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// Cache references to key DOM elements
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// Cache references to key DOM elements
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