At-rules

Statements that start with @ and control the stylesheet itself: conditions, the cascade, fonts and counters, animation, pages and more. Every at-rule that ships in at least one of Chrome, Firefox or Safari is here, with its descriptors and, for the conditional rules, every media and container feature. All of them are also in the search and the A–Z.

Conditional rules →

@media, @supports and @container, with every media feature and container feature they can test.

Cascade & scope →

@import, @layer, @namespace and @scope: how rules are loaded, ordered and bounded.

Fonts & counters →

@font-face and its descriptors, @font-feature-values and its feature blocks, @font-palette-values and @counter-style.

Other rules →

@keyframes, @property, @page and its margin boxes, @charset, @starting-style, @view-transition, @position-try and @function.