Specificity of the most specific complex selector in its selector list argument doesn't counts for :nth-child() and :nth-last-child() selectors

[Semigradsky]

See example 59 from https://www.w3.org/TR/selectors-4/#specificity-rules

:nth-child(even of li, .item) has a specificity of (0,2,0)—like a class selector (.item) plus a pseudo-class—when matched against any of <li>, <ul class=item>, or <li class=item id=foo>.

:nth-child(even of li, .item)

AST (in recursive parsing mode):

{
	"type": "pseudo-class",
	"content": ":nth-child(even of li, .item)",
	"name": "nth-child",
	"argument": "even of li, .item",
	"pos": [
		0,
		29
	]
}

Specificity: 0,1,0

[LeaVerou]

Yes, this syntax is not accounted for yet. It's parsed correctly due to Parsel's permissiveness, but it's not implemented in the specificity calculation.