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They do if they have any competition. Browsers are the perfect example here: a browser which responds to broken HTML by not working, but not exploding either, is going to lose out to one which does work. That means market forces pin the disagreement in place.



IE did well for many years. That's why people used quirks mode and work arounds.

What's the current market share for IE? 30% 40%? That seems pretty good for a browser which for years was a broken malware propagating mess.


Put more succinctly: Gresham's Law trumps Postel's Principle.




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