I think the difference between IE6 and WebKit is that in all of Apple's documentation they say WARNING DO NOT USE -WEBKIT EXTENSIONS -- THESE ARE NOT STANDARDIZ

I think the difference between IE6 and WebKit is that in all of Apple's documentation they say WARNING DO NOT USE -WEBKIT EXTENSIONS -- THESE ARE NOT STANDARDIZED YET AND ARE SUBJECT TO CHANGE and explain the dangers of using standards that are currently in development. Microsoft is kind of the opposite, encouraging people to use ActiveX, Silverlight, etc. as hard as they can.