4cac64804c775e2683" hidden>
    <p>Here is some markdown including <a href="https://twitter.com/heydonworks">a link</a>. Donec erat est, feugiat a est sed, aliquet pharetra ipsum. Vivamus in arcu leo. Praesent feugiat, purus a molestie ultrices, libero massa iaculis ante, sit amet accumsan leo eros vel ligula.</p>

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<p>Successive collapsible sections fit snugly together. The second of the following two has <code>open=&quot;true&quot;</code>.</p>

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    <h2>