Add clarification for writing-mode and other styles. (w3c#9092)

Author: khushalsagar

css-view-transitions-1/Overview.bs

@@ -883,8 +883,9 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
 		* Style the element captures ''::view-transition-old()'' and ''::view-transition-new()''
 			to match the size and position set on ''::view-transition-group()''
 			(insofar as possible without breaking their aspect ratios)
-			as it interpolates between them
-			(see [=dynamic view transition style sheet=]).
+			as it interpolates between them.
+			Since the sizing of these elements depends on the mapping between logical and physical coordinates,
+			[=dynamic view transition style sheet=] copies relevant styles from the DOM elements.
 		* Set up a default quarter-second cross-fade animation
 			for each ''::view-transition-group()''.
 	</details>