100% spec implementation doesnt stop innovation. One browser vendor just needs to respect the spec. If ones want to add more features then i dont see how respecting makes innovation hard. You can still build on top of the spec. Just respect it.

But it is my duty as a web developer to ensure the features i use will be available widely , i dont want to get trapped into this on that plateform , while other major browsers will never implement some "innovative" features.

So innovation if you want, but i care only about stability.