title: Supply new code to a DIV if content within it is removed
body: <p>I wonder if it's possible in jQuery/JS:</p>
  
  <p>If “foobar” is removed or gone from the HTML code</p>
  
  <pre><code>&lt;div id="foo"&gt;
   &lt;div id="line1"&gt;...&lt;/div&gt;
   &lt;div id="line2"&gt;foobar&lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>I'd like to automatically add “new”</p>
  
  <pre><code>&lt;div id="foo"&gt;
   &lt;div id="line1"&gt;...&lt;/div&gt;
   &lt;div id="line2"&gt;new&lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>I'd like to have "new" displayed when someone deleted "foobar" from #line2. It's for attribution purposes.</p>