Tipsy

jquery.tipsy (a local fork of tipsy code) is in core, and more technically documented at ResourceLoader/Default_modules. Many extensions load it, such as Echo, Flow, and UniversalLanguageSelector.

The default code is given Agora appearance and behavior (as specified in mockups like https://trello.com/c/vr0Oai8G) via [?these additional components?].

See also, Open bugs list