[selectors-4] Exclude pseudo-elements from :has() and :nth-child() #7463 #8212

Author: fantasai

selectors-4/Overview.bs

@@ -1225,7 +1225,7 @@ The Specificity-adjustment Pseudo-class: '':where()''
 The Relational Pseudo-class: '':has()''
 
 	The relational pseudo-class, :has(),
-	is a functional pseudo-class taking a <> as an argument.
+	is a functional pseudo-class taking a <real-selector-list>> as an argument.
 	It represents an element if any of the relative selectors
 	would match at least one element
 	when [=anchor element|anchored against=] this element.
@@ -2905,7 +2905,7 @@ Child-indexed Pseudo-classes
 	are among An+Bth elements
 	from the list composed of
 	their inclusive siblings that match the selector list S,
-	which is a <>.
+	which is a <real-selector-list>>.
 	If S is omitted,
 	it defaults to ''*|*''.
 
@@ -3002,7 +3002,7 @@ Child-indexed Pseudo-classes
 	from the list composed of
 	their inclusive siblings that match the selector list S,
 	counting backwards from the end.
-	S is <>.
+	S is <real-selector-list>>.
 	If S is omitted,
 	it defaults to ''*|*''.
 
@@ -3530,17 +3530,25 @@ Grammar
 
 	<complex-selector-list> = <>#
 
+	<complex-real-selector-list> = <>#
+
 	<compound-selector-list> = <>#
 
 	<simple-selector-list> = <>#
 
 	<relative-selector-list> = <>#
 
+	<relative-real-selector-list> = <>#
+
 	<complex-selector> = [ <>? <>* ]!
 	     [ <>? [ <>? <>* ]!  ]*
 
+	<complex-real-selector> = <> [ <>? <> ]*
+
 	<relative-selector> = <>? <>
 
+	<relative-real-selector> = <>? <>
+
 	<compound-selector> = [ <>? <>* ]!
 
 	<pseudo-compound-selector> =  <> <>*