title: What child elements are valid inside of a <li>?
body: <p>Say I have</p>
  
  <pre><code>&lt;li&gt;&lt;/li&gt;
  </code></pre>
  
  <p>What are the rules when putting other tags inside of these? For instance</p>
  
  <pre><code>&lt;li&gt;Hello. &lt;p&gt;I am a paragraph&lt;/p&gt;&lt;/li&gt;
  </code></pre>
  
  <p>or</p>
  
  <pre><code>&lt;li&gt;Hello. &lt;span&gt;I am a span&lt;/span&gt;&lt;/li&gt;
  </code></pre>
  
  <p>What should be taken into consideration when doing this?</p>