This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
http://lists.w3.org/Archives/Public/www-style/2010Feb/0077.html (Or resolve this as undefined explicitly)
Also http://lists.w3.org/Archives/Public/www-style/2010Apr/0526.html
Is this being postponed to level 2?
Is this tracker still being used? The conversation is at https://github.com/w3c/csswg-drafts/issues/626