Precursor: T216152 (once resolved this task will be unstalled)
== Acceptance criteria
[] If the device size is smaller than the total length of the menu, the menu will scroll
- some indication that the menu is scrollable will be present (see design notes for more detail)
[] The main page will not be scroll-able when the menu is open
[] note - this change is for all users
== Design notes
- The menu should be scrollable but the page itself should not scroll
- Scrolling indicator — it would be great to communicate to the user that there are more menu items offscreen/blow. When the menu is first opened the scrollbar should appear then quickly fade out, indicating the additional contents below (it seems like sometimes browsers do this by default - need to investigate further)
- It might make sense to do this in conjunction with T206354
== Designs
| full | iOS | Android
| {F28258012} | {F28258014} | {F28258039}
== QA instructions
[] should test Special:Mobile_menu as well