title: jQuery Selectors - where item does not have children with a certain class
body: <p>I want to select list items that are immediate children of #nav, that do not themselves have immediate children with an 'active' class.</p>
  
  <p>This is what I think it should be but it does not work:</p>
  
  <pre><code>$('#nav &gt; li:not(&gt; a.active)')
  </code></pre>