code: function down() {
          var role = getRole(), parentRole = getParentRole();
  
          if (role == "menuitem" && parentRole == "menubar") {
            enter();
          } else if (role == "button" && getAriaProp('haspopup')) {
            enter({ key: 'down' });
          } else {
            moveFocus(1);
          }
        }
docs: Moves the focus to the up this is called by the down key.
  
  @private