[5cents]

It remainds me very much of tiddlywiki [1], which is not as simple and limits the js hackability as default (for security), bu is also a self-contained html+js file

[1] https://tiddlywiki.com/

[timcwinkler]

Actually tiddlywiki was what made me realize that something like this was possible. Much more complex. The key thing was the ability to "save".