If that were true then there wouldn't be any odd quirks of behavior specific to WebKit. And there are plenty.
It's not so much about going by the core specifications - browsers have become better at that - it's about all the tiny pieces of behavior around the edge that aren't in specifications. And with a monoculture of browser engines it's far more likely that a piece of unspecified behavior *becomes* a de-facto standard because "most browsers" "do it like that".
And that's where you start entering dangerous territory, standards-wise.
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