It's not about looks, but about behavior. Fun Fact: In Safari since version 3, the <input> elements aren't actually native widgets anymore, as NSButton et. al.

It's not about looks, but about behavior. Fun Fact: In Safari since version 3, the <input> elements aren't actually native widgets anymore, as NSButton et. al. couldn't support a bunch of the CSS attributes. They are now rigorous behavior-level reimplementations! A widget that looks native but behaves differently is terrible! At least when it looks alien you don't expect it to behave natively.