Variable: mouse-wheel-up-event
mouse-wheel-up-event is a customizable variable defined in
mwheel.el.gz.
This variable is obsolete since 30.1; use mouse-wheel-buttons
instead.
Value
mouse-5
Documentation
Event used for scrolling up, beside wheel-down, if any.
Probably introduced at or before Emacs version 30.1.
Source Code
;; Defined in /usr/src/emacs/lisp/mwheel.el.gz
(defcustom mouse-wheel-up-event 'mouse-5
"Event used for scrolling up, beside `wheel-down', if any."
:group 'mouse
:type 'symbol
:set #'mouse-wheel-change-button)