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For example, the W3C spec defines a constructor for the ImageData interface, but WHATWG's one is not. Note that this is only a tiny example of gazillions of differences. +++ This bug was initially created as a clone of Bug #21045 +++ I was totally confused by HTMLImageElement's named constructor. If both spec editors won't work together, which spec do we have to follow? (Of course you will say "The W3C's one." :) It would be the nightmare if implementers have to watch both specs and determine which description is newer.
Is this still an issue? For the most part, the W3C level 2 and whatwg version of the spec should be in sync.