title: Fade in and out a Bootstrap 3 modal
body: <p>I have given my <a href="http://getbootstrap.com/javascript/#modals" rel="noreferrer">Bootstrap 3 modal</a> a 'fade' class but the modal doesn't 'fade' in and out as I expect it to. It seems to slide in from above, rather than fade in.</p>
  
  <p>Modal:</p>
  
  <pre><code>&lt;div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true"&gt;
    &lt;div class="modal-dialog"&gt;
      &lt;div class="modal-content"&gt;
        &lt;div class="modal-header"&gt;
          &lt;button type="button" class="close" data-dismiss="modal" aria-hidden="true"&gt;&amp;times;&lt;/button&gt;
          &lt;h4 class="modal-title" id="myModalLabel"&gt;Modal title&lt;/h4&gt;
        &lt;/div&gt;
        &lt;div class="modal-body"&gt;
          ...
        &lt;/div&gt;
        &lt;div class="modal-footer"&gt;
          &lt;button type="button" class="btn btn-default" data-dismiss="modal"&gt;Close&lt;/button&gt;
          &lt;button type="button" class="btn btn-primary"&gt;Save changes&lt;/button&gt;
        &lt;/div&gt;
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Trigger button:</p>
  
  <pre><code>&lt;button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal"&gt;
    Launch demo modal
  &lt;/button&gt;
  </code></pre>
  
  <p>To show an example of how I'd expect a 'fade' effect to look I've created this example:  <a href="http://jsfiddle.net/spQp5/" rel="noreferrer">http://jsfiddle.net/spQp5/</a> </p>
  
  <p>How can I get my modal to 'fade' in and out like this?</p>