Is it possible to select the last n items with nth-child?

Question

Using a standard list, I\'m trying to select the last 2 list items. I\'ve various permutations of An+B but nothing seems to select the last 2:

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Answer 1

Because of the definition of the semantics of nth-child, I don't see how this is possible without including the length of the list of elements involved. The point of the semantics is to allow segregation of a bunch of child elements into repeating groups (edit - thanks BoltClock) or into a first part of some fixed length, followed by "the rest". You sort-of want the opposite of that, which is what nth-last-child gives you.