[scroll-animations-1] Add note about w3c#8233

Author: fantasai

scroll-animations-1/Overview.bs

@@ -753,6 +753,16 @@ spec: cssom-view-1; type: dfn;
 	the entire animation is then scaled to fit the [=iteration duration=]
 	and repeated for each iteration.
 
+	Note: It's unclear what the use case might be
+	for combining absolutely-positioned keyframes
+	with iteration counts above 1;
+	this at least gives a defined behavior.
+	(An alternative, but perhaps weirder, behavior
+	would be to take such absolutely-positioned keyframes
+	“out of flow” while iterating the remaining keyframes.)
+	The editors would be interested in hearing about
+	any real use cases for multiple iterations here.
+
 ## Named Timeline Scoping ## {#timeline-scope}
 
 	A named [=scroll progress timeline=] or [=view progress timeline=]