Last modified: 2014-09-04 03:45:35 UTC
Created attachment 16066 [details]
So they appear on living style guide (LSG)
There is no concept of a menu in MediaWiki UI. This is a Flow component, and it will need to be moved to core before it can be documented and put in the styleguide as mw-ui-menu or whatever it is.
That effectively means it's a proposed enhancement to MW UI, so I still think it belongs in the MW UI component, similar to other features that have versions but outside of MW UI (e.g. bug 55535) and upstreaming is requested.