title: Does HTML 5 need `<html xmlns="http://www.w3.org/1999/xhtml">`
body: <p>When writing a html 5 doctype, are you supposed to include the <code>&lt;html xmlns=&quot;http://www.w3.org/1999/xhtml&quot;&gt;</code> as you did when previously using HTML4 doctype or should a different xhtml be used?</p>
  <pre><code>&lt;!DOCTYPE html&gt; 
  &lt;html xmlns=&quot;http://www.w3.org/1999/xhtml&quot;&gt;
  </code></pre>