title: How do I get the navigation to collapse into the small icon for mobile devices?
body: <p>If you go on <a href="http://twitter.github.com/bootstrap/" rel="noreferrer">Twitter-Bootstrap</a> website and reduce the window size below 1024x768, the navigation will change into an icon that you click for it. Is this one of the javascript plugins? How do I get my website to do the same thing?</p>
  
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  <p>EDIT</p>
  
  <p><img src="https://i.stack.imgur.com/4RaVH.png" alt="strange"></p>