CSS 3 Module <== Test # ==>
W3C Selectors 91 of 140 of the static tests category
Testing Date Revision
Negation pseudo-class cannot be an argument of itself (ID #83) 11-july-2001 1.0

This paragraph should have a green background

p { background-color : lime }
p:not(:not(p)) { background-color : red }
<p>This paragraph should have a green background</p>