Differences between Safari for Windows and Safari for Mac
Style sheet rendering is significantly different between Safari and Windows. To see this, try creating a page that has an element with a z-index of -1. The windows version will function without issue, the Mac version will not allow you to select the elements. Trust me, I wasted about three hours trying to figure out by trial and error why a page would work in one system but not the other. The worst bit is that when Safari doesn't render something properly, it does so without any indication. You have to debug line for line, a dreadful experience.