Stefan Monnier wrote:
As does MS Windows at the API level, but these messages are intended
for end users, not programmers, so it is better to follow how the keys
are labelled on the majority of modern keyboards than the names used in
the header files.
Why does not key-description use the names <page down> and <page up>?
'Cause X11 calls them `prior' and `next'?
Personally, the last time I saw these keys labelled Next and Prior was
in 1992. Since then, every keyboard I have used has labelled them Page
Up/Page Down or PgUp/PgDn or some other abbreviation.
But I wouldn't suggest changing this until after the release, as it
probably affects lots of documentation, even if we keep the old names
as aliases for backwards compatibility.