title: Css attribute selector where attribute name containing : in it
body: <p>I'm trying to target an elements attribute that contains a colon: <code>:</code></p>
  
  <pre class="lang-css prettyprint-override"><code>.someclass[xml:lang="da"]
  </code></pre>
  
  <p>HTML:</p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;span class="someclass" xml:lang="da"&gt;
  </code></pre>
  
  <p>Is this possible, does not work with above syntax?</p>