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Invalid CSS

CSS declarations that are not valid and that I wish existed.

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animation-repeat-period: 3s

display: visually-hidden

display: masonry

:wrapped { ... }

:stuck { ... }

border-color: gradient(...)

collapsing: none

place: center

font-family: system-font

position-items: center

position: temporal

color: anthracite

float: top

My latest Last.fm tracks: hannah jadagu - Six Months Blonde Redhead - Mind To Be Had Melenas - Despertar The Shins - Weird Divide - 2021 Remaster Goldfrapp - Become the One