The attached test case does not render properly. To see the bug, counters need to be implemented (http://bugzilla.opendarwin.org/show_bug.cgi?id=4980), but I have not yet committed that patch, so this bug is not yet present in the nightlies. I am filing it anyway in anticipation.
Created attachment 10767 [details] Test case
This test is wrong, but documents a bug in Firefox' implementation.
Okay. Actually this tests documents a difference between CSS21-CR and the most recent WD, where the recent WD has been changed to match Firefox(!). So the current behavior is compliant with the old Candidate Recommendation and with Opera, but not with Firefox. Previous cases like this have ended in a compromise, so it hard to say how this is going to end.
The reported test case is properly renderes in WebKit r39524.
Have patch that fixes most counter issues per the most current CSS2.1 spec, that is Works just as FireFox and IE8. shall submit by tomorrow.
I believe that this Test case is already fixed in the latest WebKit code, but there are still other nesting issues that are not.