> If you break Safari then no one on an iPhone or iPad can use your site. A CSS issue is not going to break any site unless it causes interactive elements to o

> If you break Safari then no one on an iPhone or iPad can use your site. 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.