Non sense. Read the reply: this is a feature that is coming to all major browsers
Chrome, Chrome, Chrome, and Chrome?
Ironically, Apple's walled garden is the last thing standing between Google and total web dominance.
A CSS issue is not going to break any site unless it causes interactive elements to overlap or be hidden from view. Most sites do not implement bleeding-edge features for this reason. Those that want to set it up will do it in such a way that there's a fallback for browsers that don't support that function.