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        will be added as a class to the document element when the slide is open. This lets you
        apply broader style changes, like switching the background.
    </p>
</section>

<section data-state="customevent">
    <h2>Custom Events</h2>
    <p>
        Additionally custom events can be triggered on a per slide basis by binding to the <code>data-state</code> name.
    </p>
    <pre><code data-trim contenteditable style="font-size: 18px; margin-top: 20px;">
Reveal.addEventListener( 'customevent', function() {
console.log( '"customevent" has fired' );
} );
    </code></pre>
</section>

<section>
    <section data-background="#007777">
        <h2>Slide Backgrounds</h2>
        <p>