nl_tokens: Same as HTML5 replaceState API but with old browser support
pl_tokens: function ( state , title , url ) { var win = this . win ; if ( this . canClientNavigate ( ) ) { win . history . replaceState ( state , title , url ) ; } else if ( url !== this . currentUrl ( ) ) { // On browsers that don't support history navigation, only want to // replace state if the URL is actually changing.  Otherwise we're // in for a potential infinite refresh loop. this . navigationWindow ( ) . location . <mask> ( url ) ; } }