nl_tokens: private == > used by Fx
pl_tokens: function ( height ) { var me = this , isNum = ( typeof height == "number" ) ; if ( isNum && <mask> . autoBoxAdjust && ! me . isBorderBox ( ) ) { height -= ( me . getBorderWidth ( "tb" ) + me . getPadding ( "tb" ) ) ; } return ( isNum && height < 0 ) ? 0 : height ; }