title: CSS :last-child:not(:only-child) not working as expected
body: <p>Currently, I have this selector:</p>
  
  <pre class="lang-css prettyprint-override"><code>.form .mid td p:last-child:not(:only-child) {
      margin-bottom: 0; 
  }
  </code></pre>
  
  <p>It's not working as intended. I want to remove the margin ONLY if there are more than one <code>P</code> inside the <code>TD</code></p>