title: JavaScript DOM: Find Element Index In Container
body: <p>I need to find an index of element inside its container by object reference. Strangely, I cannot find an easy way. No jQuery please - only DOM.</p>
  
  <pre><code>UL
   LI
   LI
   LI - my index is 2
   LI
  </code></pre>
  
  <p>Yes, I could assign IDs to each element and loop through all nodes to match the ID but it seems a bad solution. Isn't there something nicer? </p>
  
  <p>So, say I have an object reference to the third LI as in the example above. How do I know it is index 2?</p>
  
  <p>Thanks.</p>