title: Attribute "lang" exists, but can not be used for this element.? W3C validation error
body: <p>I'm using this dtd</p>
  
  <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"&gt;
  &lt;html lang="en" xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"&gt;
  </code></pre>
  
  <p>Error is for this attribute?</p>
  
  <pre><code>&lt;html lang="en"&gt;
  </code></pre>
  
  <p>Should i remove this from DTD?</p>