[scroll-animations-1] Remove preceding sibling scope #7759

Author: fantasai

scroll-animations-1/Overview.bs

@@ -757,17 +757,13 @@ spec: cssom-view-1; type: dfn;
 	is referenceable in 'animation-timeline' by:
 	* the declaring element itself
 	* that element’s descendants
-	* that element’s following siblings and their descendants
 
 	If multiple elements have declared the same timeline name,
 	the matching timeline is the one declared
-	on the nearest element in tree order,
-	which considers siblings closer than parents.
+	on the nearest element in tree order.
 	In case of a name conflict on the same element,
 	[=scroll progress timelines=] take precedence over [=view progress timelines=].
 
-	ISSUE: Do we want to expand this scope to preceding siblings and/or distant cousins?
-
 ## Animation Events ## {#events}
 
 	[=Scroll-driven animations=] dispatch all the same animation events