Once we can rely on it, FitVids (which I use on literally every site I make in one form or another) can entirely go away in favor of a handful of CSS applied directly to the elements (usually videos-in-<iframe>s).
It is time to rethink how we cook a set of favicons for modern browsers and stop the icon generator madness. Currently, frontend developers have to deal with 20+ static PNG files just to display a tiny website logo in a browser tab or on a touchscreen. Read on to see how to take a smarter approach and adopt a minimal set of icons that fits most modern needs.
I’d absolutely love to see something happen in CSS to make this easier. Using CSS custom properties for generic state would be amazing. We could apply arbitrary styles when the UI is in arbitrary states! Think of how useful media queries are now, or that container queries will be, but compounded because it’s arbitrary state, not just state that those things expose.