A curated, versioned CSS reference with an example per entry: selectors, box model, flexbox, grid, positioning, typography, color and background, units and functions, transitions and animations, responsive and container queries, and cascade/modern features (layers, nesting, :has, container queries, @property). Entries newer than 2023 name their Baseline status. Search by property, selector, function or words, or pick a section. Source, version and review date are printed with every result. Everything runs locally.