[css-content-3] Counters aren't <<string>>, so incorporate them explicitly into the 'content' property value definition. #1929

Author: fantasai

css-content-3/Overview.bs

@@ -86,7 +86,7 @@ Inserting and replacing content with the 'content' property</h2>
 
 	<pre class='propdef'>
 		Name: content
-		Value: normal | none | [ <<content-replacement>> | <<content-list>> ] [/ <<string>> ]?
+		Value: normal | none | [ <<content-replacement>> | <<content-list>> ] [/ [ <<string>> | <<counter>> ]+ ]?
 		Initial: normal
 		Applies To: all elements, tree-abiding pseudo-elements, and page margin boxes
 		Inherited: no
@@ -167,7 +167,7 @@ Inserting and replacing content with the 'content' property</h2>
 			Equal to:
 
 			<pre class=prod>
-			[ <<string>> | contents | <<image>> | <<quote>> | <<target>> | <<leader()>> ]+
+			[ <<string>> | contents | <<image>> | <<counter>> | <<quote>> | <<target>> | <<leader()>> ]+
 			</pre>
 
 			Replaces the element's contents with one or more anonymous inline boxes
@@ -194,7 +194,7 @@ Inserting and replacing content with the 'content' property</h2>
 			Note: If the value of <<content-list>> is a single <<image>>,
 			it must instead be interpreted as a <<content-replacement>>.
 
-		<dt><dfn>/ <<string>></dfn>
+		<dt><dfn>/ [ <<string>> | <<counter>> ]+</dfn>
 		<dd>
 			Specifies the "alt text" for the element.
 			See [[#alt]] for details.