I am struggling with a menu that is supposed to include sliders and spinbuttons. It's not going well. Aria has roles for sliders and spinbuttons, but AFAICT they are not permitted inside a menu role.

For an example of a menu containing both a slider and radio buttons, inspect the Sound menu in Mac OS. This is the kind of thing I am hoping to achieve. (Apple has had a volume slider in the menu since the earliest versions of the Mac System, so this is not a new or exotic UI idea).

Have menuitem widgets other than menuitemcheckbox and menuitemradio been discussed or proposed? I haven't been able to find any threads on this topic.

If not, I would like to propose menuitemslider, and menuitemspinbutton for inclusion in a future version of aria.