title: How to search the children of a HTMLDivElement?
body: <p>I have an <code>HTMLDivElement</code>, and my goal is to find a <code>div</code> nested beneath this. </p>
  
  <p>Ideally I'd want something like <code>getElementById</code>, but that function doesn't work for <code>HTMLDivElement</code>. </p>
  
  <p>Do I need to manually traverse the graph, or is there an easier way?</p>