<csstest def="Negation pseudo-class cannot be an argument of itself" module="W3C Selectors" modulename="css3-modsel" number="83" 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>p { background-color : lime }
p:not(:not(p)) { background-color : red }</cssrules>

<code>
<p xmlns="http://www.w3.org/1999/xhtml">This paragraph should have a green background</p>
</code>
</csstest>