Well, one reason might be that they care about not having buggy code. You may laugh, but for the standards IE9 claims to implement it does a very good job. Mu

Well, one reason might be that they care about not having buggy code. You may laugh, but for the standards IE9 claims to implement it does a very good job. Much better than Webkit, in my testing. > There should really be just one rendering engine. No. That's really a terrible idea, because different rendering engine consumers have different priorities. Luckily, even "webkit" has a number of forks that are somewhat incompatible for precisely that reason. So we're in no danger of this "one rendering engine" thing. (A note: while we've already been close to having one rendering engine with a priority of "change nothing", having one with pretty much any other priority set is no better; those priorities will be wrong for _some_ consumer.)