title: :not(:empty) with space in CSS
body: <p>I would like to apply a CSS rule on a div when it is empty. Problem: the application which generate the html puts a space:</p>
  
  <pre><code>&lt;div class="my-div"&gt; &lt;/div&gt;
  </code></pre>
  
  <p>So I tried:</p>
  
  <pre><code>.my-div:not(:empty) {...}
  </code></pre>
  
  <p>But it doesn't work because of the space.</p>
  
  <p>How can I do that in CSS ?</p>
  
  <p>Thank you</p>