[css-highlights-api] Defer to DOM for range invalidation

See #4597

Author: frivoal

css-highlight-api-1/Overview.bs

@@ -497,9 +497,8 @@ Range Updating and Invalidation</h3>
 	</div>
 
 	When computing how to render a document,
-	if [=start node=] or [=end node=] of any [=range=]
-	in the [=highlight registry=] associated with that document's window
-	refer to a {{Node}} whose [=shadow-including root=] is not that document,
+	if any {{StaticRange}} in the [=highlight registry=] associated with that document's window
+	is not <a spec=dom for="StaticRange">valid</a>,
 	the user agent must ignore that [=range=].
 	If the [=start offset=] or [=end offset=] of any [=range=]
 	are greater than the corresponding node’s <a spec=dom>length</a>,