title: Finding closest element without jQuery
body: <p>I am trying to find the closest element with a specific tag name without jquery. When I click on a <code>&lt;th&gt;</code> I want to get access to the <code>&lt;tbody&gt;</code> for that table. Suggestions? I read about offset but didn't really understand it too much. Should I just use:</p>
  
  <p>Assume th is already set to clicked th element</p>
  
  <pre><code>th.offsetParent.getElementsByTagName('tbody')[0]
  </code></pre>