Anything that is supposed to replace web UI frameworks needs to be able to perform client side routing. You can argue that the different colors shouldn't represent a push to history, but that's a criticism of the implementation, not the library.

Demos should cover the happy path really well. This opens modals that don't have an x to close them. If you click outside the modal, a common alternative way to close modals, it just picks a different color. The background fades to black so you can't see what you are picking. Then the back-stack grows large so you can't even back out of the demo normally. I'm not going to look at the code, even if it looks great this isn't an experience I'd ever want. There just too much basic stuff missing.

Maybe it's just a poor demo, are there better examples?

Anything that's like a combination of react and a static site generator? Where it has the ability to build a static site but also includes reactivity

I'm not a fan of websites with super huge font. I'm on a 1080, and a lot of the words fit in a smaller font just fine.

The modal when showing a single colour also suffers from backdrop stacking issues, which the back button navigation doesn't undo.

I guess rendering the UI as a function of state still has its merits.

So it implements core SPA functionality?

Why is that bad? That's implementation detail and I would say the right implementation.

When you click links it changes the URL, so the back button takes you to the previous URL.

I absolutely hate when pages hijack the back button, but this ain’t it.

I mean, it’s not a dark pattern hijacking the back button, it’s a bug hijacking the back button.

It’s still a bad experience, though.

It's not hijacking back like it happens with some sites that redirect and such. It's just pushing each color into history.