Is it possible in Emacs to change the font size of a single character or region, without affecting the whole Emacs window?
In Elisp programs the following form does the trick for the text in the current region.
(add-face-text-property (region-beginning) (region-end) '(:height 200))
Replace 200 with the number of your choice.
This only works for buffers without font-lock. If font-lock is active you need to add the
:size face attribute via