Re: Um, what?
Can't see opera having enough of a market share to be worthwhile including in this argument, there's plenty of other webkit browsers too, but they don't have market share.
So that leaves Safari.
I'm happy for MS to build their own though, hope it works for them and performs at similar levels, if they can just then keep up with the others that would be good.
Finally more importantly, if they stop supporting anyone using anything less than IE10, maybe the rest of us can stop supporting the hideous creations that were previous versions. I cry every time someone says they have users using IE7 still and they want the site to work still