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The theming on Linux desktops is generally CSS based. For example, gtk/gnome shell is fully styled with CSS - with shell extensions written in JS.

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but it's not as extensible. I know GTK uses JS and CSS but I'm not talking about that.

I'm talking about something made purely in HTML + CSS + JS. Something like this: https://macos-web.app/

If only these could support native Linux apps somehow (through a WM).

chromeos?

Yes, something like that but with the holy trinity. DahliaOS actually does something like that but with Flutter.

Thanks for mentioning this, never heard of it but it looks good.

Built in Flutter, I believe.

the underlying system has to be something - it can't be HTML all the way down to the CPU microcode. There was also the short-lived FirefoxOS, which is now https://en.wikipedia.org/wiki/KaiOS and countless kiosks.

> the underlying system has to be something - it can't be HTML all the way down to the CPU microcode

Exactly what I was stating to GP (or implying, now that I read it over) — pretty sure Flutter is OpenGL or <canvas> or etc, and not outputting to HTML or some DOM like React et. al. are doing.

There's also externOS, it's exactly what I'm talking about: https://www.tecmint.com/externos-nodejs-based-linux-distribu...

sounds rather memory intensive.

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