title: Why isn't my document validating as XHTML 1.1 STRICT?
body: <p>While target="_blank" is deprecated, why is the W3C validator not giving an error about this ? You can paste and check this code int the <a href="http://validator.w3.org/#validate_by_input" rel="nofollow noreferrer">validator</a>:</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 xmlns="http://www.w3.org/1999/xhtml"&gt;
  &lt;head&gt;
  &lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt;
  &lt;title&gt;Untitled Document&lt;/title&gt;
  &lt;/head&gt;
  
  &lt;body&gt;
  
  &lt;p&gt;
  &lt;a href="http://www.stackoverflow.com" title="New window will open" target="_blank"&gt;Link opens in new window&lt;/a&gt;
  &lt;/p&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p><strong>Edit:</strong></p>
  
  <p>Does it mean that XHTML 1.1 supports target=”_blank”, but XHTML 1.0 strict does not? Or is it a bug in the W3C validator?</p>