Specifically, `<!--` has the same effect as `//` i.e. it begins a single-line comment. (`-->` has no special meaning at all.)
Well, today I learned that <!-- this --> is syntactically acceptable JavaScript
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I can't find any reference to this in the specification, but seemingly every JavaScript engine accepts it, for obvious historical reasons
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if you add two literals to left and right and prioritize pre-increment before post-increment, I guess you could get perfectly valid C
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....aaaaaaand nope, --this has less precedence than this--. Still I kindof see myself giving this to students as C++ homework.
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