[css-values-4] Allow UA-defined limit for very large and infinite values, #10507

Author: svgeesus

css-values-4/Overview.bs

@@ -4199,6 +4199,9 @@ Degenerate Numeric Constants: ''infinity'', <nobr>''-infinity''</nobr>, ''NaN''<
 	When a [=calculation=] or a subtree of a [=calculation=]
 	becomes [=infinite=] or [=NaN=],
 	representing it with a numeric value is no longer possible.
+	A UA may have an 
+	<dfn export>implementation-defined limit for values approaching infinity</dfn>.
+
 	To aid in serialization of these degenerate values,
 	the following additional math constants are defined: