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CSS at-rules

At-rules are CSS statements that instruct CSS how to behave. They are used to group and structure style rules and other at-rules, declare style information not directly associated with selected content, and manage syntactic constructs such as imports and namespaces keyword mappings. They begin with an at-sign, @ (U+0040 COMMERCIAL AT), followed by an identifier.

Index of at-rules and at-rule descriptors

@charset
@color-profile
@container
@counter-style
- additive-symbols
- fallback
- negative
- pad
- prefix
- range
- speak-as
- suffix
- symbols
- system
@custom-media
@document
@font-face
- ascent-override
- descent-override
- font-display
- font-family
- font-feature-settings
- font-stretch
- font-style
- font-variation-settings
- font-weight
- line-gap-override
- size-adjust
- src
- unicode-range
@font-feature-values
- font-display
@font-palette-values
- base-palette
- font-family
- override-colors
@function
@import
@keyframes
@layer
@media (see list of media features in the next section)
@namespace
@page
- page-orientation
- size
@position-try
@property
- inherits
- initial-value
- syntax
@scope
@starting-style
@supports
@view-transition

Index of media features

Specifications

Specification
CSS Syntax Module Level 3

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This page was last modified on Dec 2, 2025 by MDN contributors.

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