[css-sizing-4] Be specific about 'stretch' becoming 0 in min size properties. #11044

Author: tabatkins

css-sizing-4/Overview.bs

@@ -874,7 +874,12 @@ Stretch-fit Sizing: filling the containing block</h3>
 
 	: Otherwise
 	::
-		Behaves as the property's [=initial value=].
+		In a [=preferred size property=],
+		[=behaves as auto=].
+		In a [=min size property=],
+		behaves as ''0''.
+		In a [=max size property=],
+		behaves as ''max-width/none''.
 
 	<div class="example">
 		For example, given the following HTML representing two [=block boxes=]: