Just what we need another "IE" creating non-standards conforming web pages.
Why do you say that? AFAIK Safari is one of, if not the most standard's compliant browser out there and I've not heard of any 'extentions'? Each browser, by standard, can have different graphics for the standard elements, like drop downs, etc. I greatly prefer Safari's over, say, Firefox but that's not a violation or extension of a standard.