[css-lists-3] Use <<counter-name>> instead of <<custom-ident>> and exclude 'none' as invalid, per CSS2.

Author: fantasai

css-lists-3/Overview.bs

@@ -653,6 +653,12 @@ Automatic Numbering With Counters</h2>
 	the <dfn export>counter properties</dfn> 'counter-increment', 'counter-set' and 'counter-reset',
 	and used with the ''counter()'' and ''counters()'' [=functional notations=].
 
+	Counters are referred to in CSS syntax
+	using the <dfn><<counter-name>></dfn> type,
+	which represents their name as a <<custom-ident>>.
+	A <<counter-name>> name cannot match the keyword ''none'';
+	such an identifier is [=invalid=] as a <<counter-name>>.
+
 	Resolving [=counter=] values on a given element is a multi-step process:
 
 	1. Existing counters are [=inherit counters|inherited=] from previous elements.
@@ -676,7 +682,7 @@ Creating Counters: the 'counter-reset' property</h3>
 
 	<pre class="propdef">
 	Name: counter-reset
-	Value: [ <<custom-ident>> <<integer>>? ]+ | none
+	Value: [ <<counter-name>> <<integer>>? ]+ | none
 	Initial: none
 	Applies to: all elements
 	Inherited: no
@@ -696,9 +702,9 @@ Creating Counters: the 'counter-reset' property</h3>
 		<dd>
 			This element does not create any new counters.
 
-		<dt><dfn><<custom-ident>> <<integer>>?</dfn>
+		<dt><dfn><<counter-name>> <<integer>>?</dfn>
 		<dd>
-			[=Instantiates=] a counter of the given <<custom-ident>> <dfn>counter name</dfn>
+			[=Instantiates=] a counter of the given <<counter-name>> <dfn>counter name</dfn>
 			with a starting value of the given <<integer>>,
 			defaulting to ''0''.
 	</dl>
@@ -722,15 +728,15 @@ Creating Counters: the 'counter-reset' property</h3>
 		See [[css-cascade-4]].
 	</div>
 
-	If multiple instances of the same <<custom-ident>> occur in the property value,
+	If multiple instances of the same <<counter-name>> occur in the property value,
 	only the last one is honored.
 
 <h3 id='increment-set'>
 Manipulating Counter Values: the 'counter-increment' and 'counter-set' properties</h3>
 
 	<pre class='propdef'>
 	Name: counter-increment
-	Value: [ <<custom-ident>> <<integer>>? ]+ | none
+	Value: [ <<counter-name>> <<integer>>? ]+ | none
 	Initial: none
 	Applies to: all elements
 	Inherited: no
@@ -743,7 +749,7 @@ Manipulating Counter Values: the 'counter-increment' and 'counter-set' propertie
 
 	<pre class='propdef'>
 	Name: counter-set
-	Value: [ <<custom-ident>> <<integer>>? ]+ | none
+	Value: [ <<counter-name>> <<integer>>? ]+ | none
 	Initial: none
 	Applies to: all elements
 	Inherited: no
@@ -765,7 +771,7 @@ Manipulating Counter Values: the 'counter-increment' and 'counter-set' propertie
 		<dd>
 			This element does not alter the value of any counters.
 
-		<dt><dfn><<custom-ident>> <<integer>>?</dfn>
+		<dt><dfn><<counter-name>> <<integer>>?</dfn>
 		<dd>
 			Sets (for 'counter-set') or increments (for 'counter-increment')
 			the value of the named counter on the element
@@ -796,7 +802,7 @@ Manipulating Counter Values: the 'counter-increment' and 'counter-set' propertie
 		</pre>
 	</div>
 
-	If multiple instances of the same <<custom-ident>> occur in the property value,
+	If multiple instances of the same <<counter-name>> occur in the property value,
 	they are all processed, in order.
 	Thus increments will compound,
 	but only the last set value will take effect.
@@ -1153,8 +1159,8 @@ Outputting Counters: the ''counter()'' and ''counters()'' functions</h3>
 
 	<pre>
 		<dfn><<counter>></dfn> = <<counter()>> | <<counters()>>
-		<dfn>counter()</dfn>  =  counter( <<custom-ident>>, [ <<counter-style>> | none ]? )
-		<dfn>counters()</dfn> = counters( <<custom-ident>>, <<string>>, [ <<counter-style>> | none ]? )
+		<dfn>counter()</dfn>  =  counter( <<counter-name>>, [ <<counter-style>> | none ]? )
+		<dfn>counters()</dfn> = counters( <<counter-name>>, <<string>>, [ <<counter-style>> | none ]? )
 	</pre>
 
 	For both functions, the first argument represents the name of a counter,
@@ -1325,7 +1331,7 @@ Outputting Counters: the ''counter()'' and ''counters()'' functions</h3>
 		but this is a *little bit* clumsy,
 		and doesn't work for siblings.)
 
-		Suggestion is to add a <css>counter-value(<<custom-ident>>)</css> function,
+		Suggestion is to add a <css>counter-value(<<counter-name>>)</css> function,
 		which returns the value of the named counter as an integer,
 		rather than returning a string.