JavaScript Update HTML only where needed

Example HTML page:

<div>
  <ul>
    <li> 1 </li>
    <li> 2 </li>
  </ul>
</div>

Then in a ajax request I get

<div>
  <ul>
    <li> 1 </li>
    <li> 2 </li>
    <li> 3 </li>
  </ul>
</div>

Is it possible to update the first one without replacing it? In that particular example it should only append a list item to the UL.

But how can I determine if some needs to be added, removed etc, if I don't know what the HTML code will look like?

Answer:1

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