Any plan for sub-menus?

[SevenOutman]

How do I render a sub-menu that is opened by a menuitem in its parent menu?

Quotes WAI-ARIA menuitem:

If the menu item has its aria-haspopup attribute set to true, it indicates that the menu item may be used to launch a sub-level menu, and authors SHOULD display a new sub-level menu when the menu item is activated.

[SevenOutman]

Any updates?