Rare Properties
- overscroll-behaviour (https://developer.mozilla.org/de/docs/Web/CSS/overscroll-behavior)
- backdrop-filter (https://css-tricks.com/almanac/properties/b/backdrop-filter/)
- line-clamp (https://developer.mozilla.org/de/docs/Web/CSS/-webkit-line-clamp)
CSS Functions
- min() (https://developer.mozilla.org/en-US/docs/Web/CSS/min)
- max() (https://developer.mozilla.org/en-US/docs/Web/CSS/max)
- clamp() (https://developer.mozilla.org/en-US/docs/Web/CSS/clamp)
Experimental
- content-visibility (https://web.dev/content-visibility/)
- reminded us of the dangers with will-change (https://developer.mozilla.org/de/docs/Web/CSS/will-change)
Pseudo-Selectors
- :focus-within (https://developer.mozilla.org/en-US/docs/Web/CSS/:focus-within)
- :focus-visible (https://developer.mozilla.org/en-US/docs/Web/CSS/:focus-visible)
https://blog.chromium.org/2020/09/giving-users-and-developers-more.html https://twitter.com/LeaVerou/status/1045768279753666562
General feature support testing
- @supports (@supports https://developer.mozilla.org/de/docs/Web/CSS/@supports)