[selectors-4] Amend the whitespace prohibitions to take <pseudo-compound-selector> into account. w3c#7085

Author: tabatkins

selectors-4/Overview.bs

@@ -3566,8 +3566,10 @@ Grammar</h2>
 
 	<dfn>&lt;relative-real-selector-list></dfn> = <<relative-real-selector>>#
 
-	<dfn>&lt;complex-selector></dfn> = [ <<compound-selector>>? <<pseudo-compound-selector>>* ]!
-	     [ <<combinator>>? [ <<compound-selector>>? <<pseudo-compound-selector>>* ]!  ]*
+	<dfn>&lt;complex-selector-unit></dfn> = [ <<compound-selector>>? <<pseudo-compound-selector>>* ]!
+
+	<dfn>&lt;complex-selector></dfn> = <<complex-selector-unit>>
+	     [ <<combinator>>? <<complex-selector-unit>> ]*
 
 	<dfn>&lt;complex-real-selector></dfn> = <<compound-selector>> [ <<combinator>>? <<compound-selector>> ]*
 
@@ -3581,7 +3583,6 @@ Grammar</h2>
 
 	<dfn>&lt;simple-selector></dfn> = <<type-selector>> | <<subclass-selector>>
 
-
 	<dfn>&lt;combinator></dfn> = '>' | '+' | '~' | [ '|' '|' ]
 
 	<dfn>&lt;type-selector></dfn> = <<wq-name>> | <<ns-prefix>>? '*'
@@ -3619,19 +3620,22 @@ Grammar</h2>
 	<li id="white-space">
 		White space is forbidden:
 		* Between any of the top-level components of a <<compound-selector>>
+			<<pseudo-compound-selector>>
 			(that is, forbidden between the <<type-selector>> and <<subclass-selector>>,
-			or between the <<subclass-selector>> and <<pseudo-element-selector>>,
+			or between the <<pseudo-element-selector>> and <<pseudo-class-selector>>,
 			etc).
 		* Between <em>any</em> of the components of a <<type-selector>>
 			or a <<class-selector>>.
 		* Between the ':'s, or between the ':' and <<ident-token>> or <<function-token>>,
 			of a <<pseudo-element-selector>> or a <<pseudo-class-selector>>.
 		* Between <em>any</em> of the components of a <<wq-name>>.
 		* Between the components of an <<attr-matcher>>.
+		* Between the <<compound-selector>> or <<pseudo-compound-selector>>s
+			in a <<complex-selector-unit>>
 		* Between the components of a <<combinator>>.
 
 		Whitespace is <em>required</em>
-		between two <<compound-selector>>s
+		between two <<complex-selector-unit>>s
 		if the <<combinator>> between them is omitted.
 		(This indicates the descendant combinator is being used.)
 	<li>