title: Bootstrap navbar-toggleable-sm not working
body: <p>I'm new to Bootstrap and I'm following a Lynda.com tutorial about the navbar. Unfortunately even though I've done exactly what is in the tutorial, it's not working how it is in the example, and I can't work out what I've done wrong. As far as I'm aware, the navbar links should stack vertically only on md and under, but they seem to be stacking vertically on any size device. </p>
  
  <p>The page is here <a href="http://www.andycharlton.co.uk" rel="nofollow noreferrer">www.andycharlton.co.uk</a></p>
  
  <p>The specific code is </p>
  
  <pre><code>&lt;div class="navmenu"&gt;
  
          &lt;nav class="navbar navbar-toggleable-sm"&gt;
  
              &lt;div class="navbar-nav"&gt;
  
                  &lt;a class="nav-item nav-link" href="#"&gt;One&lt;/a&gt;
                  &lt;a class="nav-item nav-link" href="#"&gt;Two&lt;/a&gt;
                  &lt;a class="nav-item nav-link" href="#"&gt;Three&lt;/a&gt;
                  &lt;a class="nav-item nav-link" href="#"&gt;Four&lt;/a&gt;
                  &lt;a class="nav-item nav-link" href="#"&gt;Five&lt;/a&gt;
                  &lt;a class="nav-item nav-link" href="#"&gt;Six&lt;/a&gt;
  
              &lt;/div&gt;&lt;!--navbar-nav--&gt;    
  
          &lt;/nav&gt;&lt;!--nav--&gt;    
  
      &lt;/div&gt;&lt;!--navmenu--&gt;    
  </code></pre>
  
  <p>Be grateful for any help! Thanks</p>