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Electron is bringing an entire web browser in to provide a cross-platform user interface. GTK has become almost a web browser to provide a cross-platform user interface. That is why I started off with

> CSS classes

To spell it out, I think it is all excessive.

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I don't think you know enough about GTK if you think having a CSS parser is bloat in a UI toolkit versus a whole theming engine.

Their CSS implementation is broader than what most actual browsers had 10 years ago. I would not have commented if I weren't already painfully familiar.

https://docs.gtk.org/gtk3/css-overview.html

It even has a DOM inspector window:

https://askubuntu.com/questions/597259/how-do-i-open-gtk-ins...

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