Layout impact of view-transition-name

Fixes w3c#8139

Author: jakearchibald

css-view-transitions-1/Overview.bs

@@ -4,7 +4,7 @@ Shortname: css-view-transitions
 Level: 1
 Status: WD
 Group: csswg
-Date: 2022-11-24
+Date: 2023-03-07
 Prepare for TR: yes
 ED: https://drafts.csswg.org/css-view-transitions-1/
 TR: https://www.w3.org/TR/css-view-transitions-1/
@@ -482,6 +482,12 @@ urlPrefix: https://html.spec.whatwg.org/multipage/rendering.html; type: dfn;
 			as either an old or new element,
 			with a <dfn dfn for>view transition name</dfn> equal to the <<custom-ident>>'s value.
 
+			Additionally, the element forms:
+
+			- a [=stacking context=].
+			- a [[css-transforms-2#grouping-property-values|group]].
+			- a [=backdrop root=].
+
 			Note: The value <css>none</css> is invalid as a <<custom-ident>>.
 	</dl>