WebKit / JavaScriptCore run on both Windows and Linux.
Just because it's not packaged as Safari doesn't mean it's not available.
Just because it's not packaged as Safari doesn't mean it's not available.
For all practical purposes, Safari is an OS X-only browser.
Whether it's popular on Windows is also irrelevant with regard to the fact that it does, indeed, work on Windows.
Windows Phone uses Trident + Chakra for its IE deployment, as well, so if we're going to make that argument, then IE is multiplatform, as well :P
1. Within reason, of course. It's not on my router (but maybe it could be)