<csstest def="Default attribute value and negation pseudo-class" module="W3C Selectors" modulename="css3-modsel" number="58" rev="1.1" date="12-november-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>
<author>Ian Hickson</author>

<cssrules>form { background-color : red }
form:not([method]) { background-color : lime }
</cssrules>

<code> <!-- 'method' is an attribute with a default value in the XHTML DTD -->
 <form action="http://www.example.org/foo.cgi" xmlns="http://www.w3.org/1999/xhtml">
  <p>The paragraph should have a green background.</p>
 </form>
</code>
</csstest>