[selectors4] :not accepts a compound selector

In http://dev.w3.org/csswg/selectors4/#overview, :not is described as:
 E:not(s) an E element that does not match simple selector s Negation
pseudo-class <http://dev.w3.org/csswg/selectors4/#negation> 3
E:not(s1, s2)an E element that does not match either compound selector
s1 or compound selector s2 Negation
pseudo-class<http://dev.w3.org/csswg/selectors4/#negation>
4Notably, the comma-separated version takes compound selectors and the
single-argument version takes a simple selector. I believe they should both
take compound selectors.

Ojan