The submenu displayed by this menu item.
- Safari Desktop 5.1+
- Safari Extensions JS
separator property is
true, the value of this property is ignored.
If the value of this property is
undefined, no submenu is displayed.
If the value is a menu that is already being displayed, no submenu is displayed and this menu item’s command is dispatched. This prevents recursive menus.
If the menu item is visible, changes to this property are not reflected until the next time the menu item is displayed.