Right now the alt value for a menu image is the menu title. Is there a place, an override, where I can change this so that I can add a field to menu: Edit Item, to input an alt value instead?
Based on the extra information, that your menu item needs to have part of it displayed using to superscript something, my suggested solution is partially the reverse of what you're asking.
- Keep the menu item name clean of HTML
- That keeps the menu image alt tag clean
- That keeps the page title clean (SEO)
- Assuming the menu item doesn't change, that makes the ReReplacer Rule cleaner.
I'd use Regular Labs ReReplacer to then find the menu item text that you need to then add the HTML to, and replace that string with the same code, adding in the where required.
So rather than removing the extra formatting in three places, you need to add it just to the one place it appears where it needs to be laid out on screen.