mart, I'm talking about rendering bugs/quirks that inhibit a design and in turn dissent from the specification. Do renderings need to be exactly the same? No. But same to the degree defined in the specs? Yes.

Don't get me wrong, I have respect for Opera, but it seems to throw me a curve ball every now and then. I can find major inconsistencies between gecko and webkit as well, but opera seems to do it slightly more often.

I will say I am impressed by Opera for certain features they implement, they're always keeping up to date. For example, they're the first browser to support the (global) content property to a high degree - something I've wanted for a long time.