Syntax and parsing of unknown pseudo-classes

CSS 3 Module	<== Test # ==>
W3C Selectors	123 of 153 of the static tests category
Testing	Date	Revision
Syntax and parsing of unknown pseudo-classes (ID #160)	2001-11-20	1.0

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  p { background: lime; }
  p:subject { background: red; } /* this is not valid CSS, and if UAs
  implemented the experimental :subject pseudo-class they should have
  used the :-vnd-ident syntax. */

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