nl_tokens: Replaces the current state .
pl_tokens: function ( path ) { var state = { path : path } ; get ( this , 'history' ) . replaceState ( state , null , path ) ; // store state if browser doesn't support `history.state` if ( ! supportsHistoryState ) { this . _historyState = <mask> ; } // used for webkit workaround this . _previousURL = this . getURL ( ) ; }