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Re:Opera confirms support for WebKit vendor prefixes by MatthewPhillips on Wednesday April 25, 2012 @02:52PM (#3890460)
Any difference in rendering between Gecko and WebKit is a bug.
Re:Opera confirms support for WebKit vendor prefixes by Dylan16807 on Wednesday April 25, 2012 @04:23PM (#3890871)
And all software has tons.
Re:Opera confirms support for WebKit vendor prefixes by batista on Thursday April 26, 2012 @02:05PM (#3895307)
No, the two browser have also different levels of implementation compliance with CSS3/CSS4 and other technologies.

So, some of those are not bugs, are differences in features.