I've been using this for personal use for around 2 years and I figured it was time to share it with the world. Criticism, issues and PRs are welcome. Thanks!
It's good that you made an alternative but it's not serious. I need to run Firefox, enable JS, reload the page, there is no "top menu" or install button, the open/save button does nothing, I can't choose my own fonts, and I guess it doesn't work if I don't have an internet connection.
> What's wrong with TextEdit on macOS?
Nothing wrong as such, but does it match the “cross-platform” description?
> Firefox … the open/save button does nothing
As per the readme, it is using an API that is not yet supported in Firefox for local file access: https://caniuse.com/native-filesystem-api
> there is no "top menu" or install button
That is meaning the browser's menu. Perhaps there is better terminology that should be used here. The readme does show a screenshot of it, so it seems clear from that to me. The install option is found there.
> and I guess it doesn't work if I don't have an internet connection.
Also in the readme: “Installable as a PWA”, which I think implies offline support, given it doesn't have sync features so has no reason once installed that way to talk to the wider network.
Yes, it's a plain-text editor too. The files are compatible with the Commodore 64 if you need.
> not yet supported in Firefox ... implies offline support ...
It implies a lot more stuff than all the other pre-installed plain-text editors on every other OS.
I read it as promising Notepad features with anything else it mentions as extras, not more features it doesn't mention from other text editors.