Well, jQuery 1.5 is out and there's yet another incompatibility: they changed the way attribute selectors work. You used to be able to use them without quotes, as
[attr=value] but that now throws an exception. Now you have to use [attr="value"]. Not sure why they changed it; The CSS level 3 definition is ambiguous about when you need quotes, and it may be that jQuery is OK with leaving the quotes off for simple (letters/numbers) values. I don't have time to experiment; I just changed things to use the quotes. It affects parsecss and flexcal; I haven't found any other places I used this. 