title: Bootstrap Accordion button toggle "data-parent" not working
body: <p>I'm trying to create an accordion using Bootstrap 3 using the button collapsible with the data attribute, without the accordion markup. It just looks more cleaner to me. </p>
  
  <p>However I cannot make the <strong>data-parent</strong> attribute to work. I want when opening a question, all others to close. I'm reading the docs ( <a href="http://getbootstrap.com/javascript/#collapse-usage" rel="noreferrer">http://getbootstrap.com/javascript/#collapse-usage</a> ) but still cannot get it to work.</p>
  
  <p>I'm using the following code:</p>
  
  <pre><code>&lt;div class="accordion" id="myAccordion"&gt;
      &lt;button type="button" class="btn btn-danger" data-toggle="collapse" data-target="#collapsible-1" data-parent="#myAccordion"&gt;Question 1?&lt;/button&gt;
      &lt;div id="collapsible-1" class="collapse"&gt;
      &lt;p&gt;Etiam posuere quam ac quam. Maecenas aliquet accumsan leo. Nullam dapibus fermentum ipsum. Etiam quis quam. Integer lacinia. Nulla est.&lt;/p&gt;
      &lt;/div&gt;
      &lt;button type="button" class="btn btn-danger" data-toggle="collapse" data-target="#collapsible-2" data-parent="#myAccordion"&gt;Question 2?&lt;/button&gt;
      &lt;div id="collapsible-2" class="collapse"&gt;
      &lt;p&gt;Etiam posuere quam ac quam. Maecenas aliquet accumsan leo. Nullam dapibus fermentum ipsum. Etiam quis quam. Integer lacinia. Nulla est.&lt;/p&gt;
      &lt;/div&gt;
      &lt;button type="button" class="btn btn-danger" data-toggle="collapse" data-target="#collapsible-3" data-parent="#myAccordion"&gt;Question 3?&lt;/button&gt;
      &lt;div id="collapsible-3" class="collapse"&gt;
      &lt;p&gt;Etiam posuere quam ac quam. Maecenas aliquet accumsan leo. Nullam dapibus fermentum ipsum. Etiam quis quam. Integer lacinia. Nulla est.&lt;/p&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Here is the JSFiddle: <a href="http://jsfiddle.net/twinsen/AEew4/" rel="noreferrer">http://jsfiddle.net/twinsen/AEew4/</a></p>
  
  <p>I'll be very happy if someone points to me where I'm making a mistake :\</p>