I'm trying to get a Wikipedia page for Single File Web Apps approved (https://en.wikipedia.org/wiki/Draft:Single_File_Web_Apps), and I'm trying to find good examples of Single File Web Apps (web apps that are just a single HTML file). Please comment if you know of any.
Some of these are indeed Single File Web Apps (though a few of them contain links to external js and such, which would disqualify those from being a SFWA).
https://hyperclay.com/ and https://feather.wiki/
Thanks for mentioning TiddlyWiki btw.
I vibecode a bunch of similar tools I use, inspired by Simon, and have them stashed where I can get to them.
https://www.adminer.org/en/
https://github.com/prettydiff/webserver
The backend is multiple files but the frontend is a single file SPA. It loads with state restoration and LCP in about 105ms.