The alternative would mean everything spec'd in pixels would look tiny on retina display devices. It's better to have a few sub-optimal border radius curves tha

The alternative would mean everything spec'd in pixels would look tiny on retina display devices. It's better to have a few sub-optimal border radius curves than to break the web completely. Personally, I think his "wrong" 2x example looks much better than the "fixed" one. The top inner border highlight is practically invisible on the latter, and the border around the button is fairly hard to see.