When were === and !== introduced?

[Maian]

How backward compatible are === and !== ? Were they always in JS, or what version were they introduced?

[Saturn]

These operators were introduced in JS 1.3 after the failed experiment ins JS 1.2 to make 1 != "1", in ohter words 1.2 didn't automatically try a type conversion for == and != .

[Maian]

Ah thanks