I mean nobody super exciting, but Steam uses it for their software, Adobe CSS uses some of it, etc.
It's more than an Apple thing.
[Edit]: Sorry, nobody outside Apple uses Safari, but a lot of people outside of Apple use WebKit, Safari's engine.
It is also primarily there to render Steam and steampowered.com so not very relevant to keeping web standards in check.
I mean nobody super exciting, but Steam uses it for their software, Adobe CSS uses some of it, etc.
It's more than an Apple thing.
[Edit]: Sorry, nobody outside Apple uses Safari, but a lot of people outside of Apple use WebKit, Safari's engine.