title: Replicate data-toggle="collapse" without jQuery
body: <p>I am using some Bootstrap code with </p>
  
  <pre><code>data-toggle="collapse"
  </code></pre>
  
  <p>Which uses their jQuery plugin Collapse, and needs jQuery to work. I won't be using much JavaScript, and I do not want the 100k that jQuery comes with, just for this one function.  Is there a light way to replicate this function?  I looked through the <a href="http://getbootstrap.com/javascript/#collapse" rel="nofollow noreferrer">documentation</a> but there is little on how to replicate. </p>
  
  <p>I tried dropping in some jQuery lite alternatives - Zepto, xui, cash  (although some of these look pretty old) - and they aren't working with the plugin out of the box.</p>
  
  <p>Is there a jQuery lite alternative that will work with this plugin? Or can I replicate the functionality - I am guessing it can be done in a much smaller package than needing jQuery?</p>