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you need to be a pro to build fancy shit with vanilla css xD

Less than you'd think. A lot of it is just knowing the right element exists. A slide-out menu that closes on Esc or when you click outside is a button with popovertarget, a nav with popover, and a few lines of CSS for the animation.

(I'm biased, I ended up writing a book about this kind of stuff: https://theosoti.com/you-dont-need-js/)

I also made a tabbed control a while back, with pure HTML + CSS (by [ab]using radio buttons & IIRC, `display: none`).

The rest of that page needed JS (it included a collaborative editor, CRDT-based --- can't avoid JS when you need it for the core thing), but since doing tabs without JS was trivial, I figured "why not".

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