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