How different is Safari running on the Mac vs. Safari running on PC? I'll soon be doing some UI work with GWT (Google Web Toolkit) and want to know if anyone thinks it is worth having a Mac available to test the browser on the different operating systems. For example, if I'm testing with Safari on a Windows machine is that similar enough to Safari on a Mac that I wouldn't need to worry about testing that the same browser on Mac vs. PC. We do plan on using the new HTML 5 standard - specifically the canvas tag- so some things will be cutting edge. Thoughts?