[scroll-animations-1] Restrict scroll/view-timeline value reordering to avoid parse ambiguity #7626

Author: fantasai

scroll-animations-1/Overview.bs

@@ -322,7 +322,7 @@ spec: cssom-view-1; type: dfn;
 
 	<pre class='propdef shorthand'>
 	Name: scroll-timeline
-	Value: [ <<'scroll-timeline-name'>> || <<'scroll-timeline-axis'>> ]#
+	Value: [ <<'scroll-timeline-name'>> <<'scroll-timeline-axis'>>? ]#
 	Applies to: [=scroll containers=]
 	Inherited: no
 	Animation type: not animatable
@@ -607,7 +607,7 @@ spec: cssom-view-1; type: dfn;
 
 	<pre class='propdef shorthand'>
 	Name: view-timeline
-	Value: [ <<'view-timeline-name'>> || <<'view-timeline-axis'>> ]#
+	Value: [ <<'view-timeline-name'>> <<'view-timeline-axis'>>? ]#
 	Applies to: all elements
 	</pre>