Because I wanted my emacs to support browser-style font zooming, with something at least vaguely like the bindings I'm used to with Firefox:
(require 'view)
(require 'zoom-frm)
; mouse-wheel up and down
(global-set-key [C-mouse-4] 'zoom-frm-out)
(global-set-key [C-mouse-5] 'zoom-frm-in)
; keypad plus, minus, and 0
(global-set-key [C-kp-add] 'zoom-frm-in)
(global-set-key [C-kp-subtract] 'zoom-frm-out)
(global-set-key [C-kp-insert] 'zoom-frm-unzoom)
(Needs zoom-frm.el)
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