[yoklov]

I'm not really well informed here, but I'd guess that he means how the animations, visual effects, Ui, etc. actually look and behave, rather than new specs.

One thing I've noticed several times is that in chrome, many CSS animations aren't animated across sub-pixel boundaries. I don't know necessarily that safari does this (again, I'm not well informed here -- for all I know this has been fixed in Chrome), but if they did, that would count in my book, despite not being a new spec.

(Honestly, my suspicion is that they aren't though, since a high dpi screen removes most of the need for sub-pixel accuracy).