[css-grid] Simplify auto-repeat to single track size, per WG resolution. Leave issue open requesting feedback.

Author: fantasai

css-grid/Overview.bs

@@ -1147,7 +1147,7 @@ Repeating Rows and Columns: the ''repeat()'' notation</h4>
 
 	<pre class='prod'>
 		<dfn><<track-repeat>></dfn> = repeat( <<positive-integer>>,     [ <<line-names>>? <<track-size>> ]+ <<line-names>>? )
-		<dfn><<auto-repeat>></dfn>  = repeat( [ auto-fill | auto-fit ], [ <<line-names>>? <<fixed-size>> ]+ <<line-names>>? )
+		<dfn><<auto-repeat>></dfn>  = repeat( [ auto-fill | auto-fit ],   <<line-names>>? <<fixed-size>>    <<line-names>>? )
 		<dfn><<fixed-repeat>></dfn> = repeat( <<positive-integer>>,     [ <<line-names>>? <<fixed-size>> ]+ <<line-names>>? )
 		<dfn><<name-repeat>></dfn>  = repeat( [ <<positive-integer>> | auto-fill ], <<line-names>>+)
 	</pre>
@@ -1209,9 +1209,13 @@ Repeating Rows and Columns: the ''repeat()'' notation</h4>
 	except that after <a href="#auto-placement-algo">grid item placement</a>
 	any empty repetitions are dropped.
 
-	Issue: Now that we have gutters, most use cases for auto-repetition will need only one track size.
-	It would also be much simpler for implementations if only one track size were allowed.
-	Should we simplify the argument to the <<auto-repeat>> functions to only allow one <<fixed-size>>?
+	Issue: In order to simplify implementation and testing requirements for Level 1,
+	the <<auto-repeat>> syntax only accepts a single <<fixed-size>>.
+	Now that we have gutters, most use cases for auto-repetition will need only one track size.
+	However, if there are important use cases for having a full track listing,
+	the CSSWG is not opposed to expanding the syntax;
+	please send such use cases to www-style@w3.org
+	for consideration.
 
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