selector list argument of :nth-child and :nth-last-child CSS pseudo-classes

selector list argument of :nth-child and :nth-last-child CSS pseudo-classes

The newest versions of :nth-child() and :nth-last-child() accept an optional of S clause which filters the children to only those which match the selector list S. For example, :nth-child(1 of .foo) selects the first child among the children that have the foo class (ignoring any non-foo children which precede that child). Similar to :nth-of-type, but for arbitrary selectors instead of only type selectors.

Spec https://drafts.csswg.org/selectors/#the-nth-child-pseudo
Status Unofficial / Note
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