Default attribute value and negation pseudo-classDaniel GlazmanIan HicksonCSS 3 Module W3C Selectors Next NEGATED class selector Previous NEGATED Attribute existence selector with declared namespace Test # 68 of 256 of the static tests category Testing Default attribute value and negation pseudo-class ID 58 Date 12-november-2001 Revision 1.1 form { background-color : red }
form:not([method]) { background-color : lime }
<!-- 'method' is an attribute with a default value in the XHTML DTD -->
<form xmlns="http://www.w3.org/1999/xhtml" action="http://www.example.org/foo.cgi">
<p>The paragraph should have a green background.</p>
</form>