old_contents: import MenuItem from './item-menu';
  
  export default class NavItem extends MenuItem {
    constructor() {
      super();
  
      this._root
        .classed('menu', false)
        .classed('nav', true);
  
      this._forward = this
        .icon()
        .class('ion-ios-arrow-forward')
        .secondary();
    }
  
    _add(element) {
      this._parts.splice(-1, 0, element);
      this._order();
    }
  
    _set() {}
  }
  
new_contents: import MenuItem from './item-menu';
  
  export default class NavItem extends MenuItem {
    constructor() {
      super();
  
      this._root
        .classed('menu', false)
        .classed('nav', true);
  
      this._forward = this
        .icon()
        .class('ion-ios-arrow-forward')
        .size('1.9em')
        .secondary();
    }
  
    _add(element) {
      this._parts.splice(-1, 0, element);
      this._order();
    }
  
    _set() {}
  }
  
subject: Make nav icon smaller