gin without the accordion markup. Make a button toggle the expanding and collapsing of another element.</p>
   <pre class="prettyprint linenums">
   &lt;button type="button" class="btn btn-danger" data-toggle="collapse" data-target="#demo"&gt;
     simple collapsible
   &lt;/button&gt;

   &lt;div id="demo" class="collapse in"&gt; … &lt;/div&gt;
   </pre>


   <hr class="bs-docs-separator">


   <h2>Usage</h2>

   <h3>Via data attributes</h3>
   <p>Just add <code>data-toggle="collapse"</code> and a <code>