Chapter summary things (in some published fiction)
I've noticed a very modern trend that's just taking off (that's what it seems like): that is, to put little summaries of what happens in each chapter, under the chapter heading. I just don't know what that's called. I'm not sure what to Google, though I tried "Scaffolding" which gave me something that seemed waaaaaaay too complicated to go in the 'summary goes here' space in published fiction.
I think my Uni lecturers mentioned it, and that it was actually an old-fashioned thing that some authors used to do but don't any more (with these exceptions). So maybe it's not new, just coming back into style.
For examples of what I mean, see The Book Thief by Markus Zusack or The Tales of the Ketty Jay by Chris Wooding (very awesome, fun Dieselpunk adventure series), or to a lesser extent The Graveyard Book by Neil Gaiman (much briefer). It's where the book says 'In which x does y and z is discovered' etc.