This is kind of like finding an unexploded World War II shell in your garden
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is it bad if I know exactly why it is that way without looking it up
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The answer to nearly every baffling question about any computer or computer-related topic is "for historical reasons"
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Correct.
(Namely, you have to implement document.all, an IE-ism, for compat reasons, but have to hide that you implement it so that braindead IE-sniffing scripts correctly detect you as not-IE. Modern IE/Edge also has to detect as not-IE, so it doesn't get the IE6 code.)
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