Restore check that range is in same document as the HighlightRegistry

Author: dandclark

css-highlight-api-1/Overview.bs

@@ -507,7 +507,11 @@ Range Updating and Invalidation</h3>
 	</div>
 
 	When computing how to render a document,
-	if any {{StaticRange}} in the [=highlight registry=] associated with that document's window
+	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,
+	the user agent must ignore that [=range=].
+	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=].