<csstest def=":root pseudo-class" module="W3C Selectors" modulename="css3-modsel" number="27" rev="1.0" date="11-july-2001" xmlns:a="http://www.example.org/a" xmlns:b="http://www.example.org/b" xmlns:html="http://www.w3.org/1999/xhtml" xmlns="http://www.example.org/css3tests">

<author>Daniel Glazman</author>

<cssrules>html { background-color : red }
*:root { background-color: lime }</cssrules>
<code>
<p xmlns="http://www.w3.org/1999/xhtml">The background of the document should be green</p>
</code>
</csstest>