title: Validation - document type does not allow element "h4" here
body: <p>I can't find out what the problem is with this line of code:</p>
  
  <pre><code>&lt;h4&gt;&lt;span class="orange"&gt;mytitle&lt;/span&gt;&lt;/h4&gt;
  </code></pre>
  
  <p>This is the error message I receive:</p>
  
  <blockquote>
    <p>document type does not allow element
    "h4" here;</p>
  </blockquote>
  
  <p>What do I need to change?
  Cheers
  Mic</p>