caller to take care of traversals to invalid targets in a page. r=adamlock, sr=alecf git-svn-id: svn://10.0.0.236/trunk@138978 18797224-902f-48f8-a5cc-f745e15eee43
caller to take care of traversals to invalid targets in a page. r=adamlock, sr=alecf git-svn-id: svn://10.0.0.236/trunk@138978 18797224-902f-48f8-a5cc-f745e15eee43