CSS Reference

CSS Reference is a free, complete guide to 841+ CSS properties, pseudo-classes, pseudo-elements, at-rules, functions, selectors, and units. Every entry includes its syntax, accepted values with explanations, a working example, and browser support data, so you can check whether a feature is safe to ship. Browse by category: Layout, Box Model, Text, Background, Flexbox, Grid, Animation, Transform, Positioning, Typography, List, Table, UI, Color, Size, Pseudo-classes, At-rules, Functions, Pseudo-elements, Selectors, Units. Popular starting points include :hover, :focus, :active, :visited, :link, :focus-within, :focus-visible, :target, :enabled, :disabled, :checked, :required, :optional, :read-only, :read-write, :placeholder-shown, :default, :indeterminate, :valid, :invalid. If you are learning CSS, the 68 in-depth guides walk through entire topics step by step, from the box model and selectors to Flexbox, Grid, and animations. Use the search page to jump straight to any property, or read the blog for deep dives on modern layout techniques.