This is used so that when the user is moving through the MenuBar while a
menu is opened, pressing the ArrowLeft or ArrowRight key will:
This should be set to the Menu's id in that the example above. Otherwise
it should be omitted.
When this is provided and a number greater than 0, this will allow the
menus to become visible on hover without clicking a MenuItemButton
beforehand. Instead, hovering over a MenuItemButton for this time in
milliseconds will display the Menu.
This should be set to false if this is a child of another Menu.
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@since 5.0.0