override shr-tag-sup to display 'superscript' in a better way

emacs_shr_sup_override.md

When emacs in text mode, the 'shr' is not rendering the superscript corretly. For this html snippet:

<strong>Explanation:</strong> 12 = 3<sup>1</sup> + 3<sup>2</sup>

It would be rendered as this: Explanation: 12 = 31 + 32

This is really confusing especially when you don't know what html was given.

By override the shr-tag-sup function, it would be rendered like this: Explanation: 12 = 3^1 + 3^2

This is the code that has been added in my config.el:

(defun my-shr-tag-sup (dom)
   "Render <sup> as ^ followed by its content."
   (insert "^")
   (shr-generic dom))

 (if (not (display-graphic-p))
     (advice-add 'shr-tag-sup :override #'my-shr-tag-sup))

great news