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CSS flexbox cheat sheet: container and item properties
CSS flexbox cheat sheet: display flex, flex-direction, justify-content, align-items, flex-wrap and gap on the container; flex, align-self, order on items.
All CSS cheat sheets
CSS :has() browser support
CSS :has() works in Chrome and Edge 105+, Safari 15.4+ and Firefox 121+, per MDN browser-compat-data. Feature-detect it with @supports selector(:has(a)).
All CSS compatibility
CSS em vs rem: which unit to use
rem is relative to the root font size, so 1rem is the same everywhere; em is relative to the element's font size and compounds when nested. When to use each.
All CSS x vs y
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