True. But since Safari can't be put on Windows I didn't include it as part of my question.
But say I did all my testing on Mac (except IE); does Chrome behave that differently between OS X and Windows that it should be tested on both? Same for Firefox?
From my experience you're OK like 90% of the time. Sometimes fonts look a little different, etc, but generally you're OK.
I agree with the grandparent though, you need to worry more about Safari because of the iPhone users that hit your site. Case in point I recently saw a site work perfectly on in all major browsers on the desktop, but Safari would get caught in a loop of repainting. The result was a webpage that looked like it hung the browser, but it was actually taking like a minute to finish rendering the page.
No doubt, Safari is tested fully. I was just curious why I would want to test Chrome on both a Mac and Windows for general web stuff; same with Firefox (since Safari can't be put on Windows).
Most places probably don't test the same browser on both unless they have a specific bug report they can't reproduce on their normal testing platform.
Given the popularity of Macs with web/front end developers, and the ease (+ legality) of running windows on Mac (vs Mac on windows), most developers end up testing ff,chrome,opera,etc on OS X and use vm(s) for ie - often the ms provided ie testing vms.
