Selector E:nth-child(n of S) and E:nth-last-child(n of S)

Test selector E:nth-child(n of S) and E:nth-last-child(n of S)

Issues: Chrome #304163, Firefox #854148

Hide :not([foo])
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CSS :nth-child(2n of [foo])

JavaScript :nth-child(2n of [foo])

Expected result