RE: Proposal: new mode-line `%'-construct %o meaning "Degree of travel of window through buffer".

[Drew Adams]

> > less offers a way to specify which window position to use as the base
> > for the percentage (top (%pt), bottom (%pb) or middle (%pm)).  That
> > works with other formats, too (line number, byte number).
> 
> FWIW: I'd love to have these placeholders supported in Emacs, so that
> I could show in the modeline the range of text (lines) I'm currently
> seeing in the window.  E.g.: "(15-25%)".

+1 to this too.  I might not use it (again), but it sounds useful.