title: How is scrollTop in JQuery supposed to function?
body: <p>I'm confused about <code>scrollTop()</code>.<br>
  jQuery docs say it should be displaying a number that represents the scrollTop offset for a given element, but as it does in my own script, on their demo it returns "0".</p>
  
  <p>Setting the scrollTop manually works great, as does using the <code>$(window).scrollTop()</code> command.  </p>
  
  <p>Does <code>scrollTop()</code> ONLY return values associated with elements that themselves contain scrollbars (such as an element with a CSS property of <code>overflow:scroll</code>)?</p>