I had heard of almost none of these HTML elements, and that's such a shame, because they could seriously help put the "we need JavaScript for every gosh darn thing" ecosystem to an end (or at least return JS to what it was originally meant to be: a way to add some flair, some interactivity, some whatever, but not necessarily a replacement for all of your markup and a full-DOM manager).

I'm starting to think my dream browser might be something like visurf https://sr.ht/~sircmpwn/visurf/ but with the underlying Netsurf engine updated to support various modern HTML+CSS, such as these elements. I bet you could have a nearly JS-free smolweb through that browser that:

1. is more accessible (in the "doesn't break screenreaders, system theming, keybinds, etc" way)

2. could be made to use way fewer resources than these heavy JS contraptions these elements can replace

3. would still be able to do most things we expect the median web app of today to do (sure, fire up Firefox for WebGL or whatever still, but I could see, say, a Matrix client potentially needing only a smidge of JS (largely for WebSockets and E2EE stuff) over top of very-modern HTML)