title: <h3> within <a> within <li> strange firefox behavior
body: <p>I have a list of search result where i put <strong><em>h3 within a anchor within li</em></strong> like so</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;li&gt;
    &lt;a href="https://www.stackoverflow.com/"&gt;
      &lt;h3&gt;h3 within anchor within li&lt;/h3&gt;
    &lt;/a&gt;
  &lt;/li&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>Tests:</p>
  
  <ul>
  <li>Chrome, safari and opera => no problem</li>
  <li>Firefox and Firefox dev Edition => strange behavior</li>
  </ul>
  
  <p>Please see the image below</p>
  
  <p><a href="https://i.stack.imgur.com/R6jfJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/R6jfJ.png" alt="enter image description here"></a></p>
  
  <p>Why Firefox render the code above like this ?</p>
  
  <p>Note: </p>
  
  <blockquote>
    <p>no style are applied </p>
  </blockquote>