title: Wordpress the_content() outputting doctype declarations
body: <p>I'm creating a fresh wordpress theme using the <a href="http://html5blank.com/" rel="nofollow noreferrer">html5blank</a> boilerplate theme for wordpress. 
  For some reason when I call the_content() I get the following wrapping the actual content:</p>
  
  <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"&gt;
  &lt;html&gt;&lt;body&gt;
  </code></pre>
  
  <p>I couldn't detect any filters affecting the_content().</p>
  
  <p>It doesn't occur when using get_the_content(), but I need to use shortcodes and the ability to auto-embed videos in the theme, so using that isn't ideal.</p>
  
  <p>Any ideas where the unwanted tags/declaration is coming from?</p>