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what's the failure? I _think_ some stuff got changed in spec land which makes acid2 no longer "correct"

That's surprising. I'd expect Acid3 to require far more effort to pass than Acid2.

Why? Acid3 just requires basic CSS support and a someone ES5 conformant js-implementation.

Acid2 was specifically built to call IE out and to put browser builders on notice. It tests the most nuanced little quirks of some specific specs; and, because of some changes in the modern standard, doesn’t actually conform anymore.

Firefox passes acid2.

Safari on iOS only scores 98/100 on Acid 3!