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This article is In Progress.


At-rules are special instructions for the CSS parser. They are invoked by an at-keyword preceded by an "@" sign.

API Name Summary
@charset Specifies the character encoding of the style sheet.
@font-face The @font-face CSS at-rule allows authors to specify online fonts to display text on their web pages. By allowing authors to provide their own fonts, @font-face eliminates the need to depend on the limited number of fonts users have installed on their computers.
@import Imports an external style sheet.
@keyframes Sets the keyframes for the CSS animation property.
@media Sets the media types for a set of rules in a styleSheet object.
@namespace Declares the default namespace and binds a namespace to a namespace prefix.
@page Specifies properties of a page box, such as its dimensions, orientation, and margins. This is used for paged media, such as the printed page.
@region Applies CSS styles to portions of content as it appears when flowing within a specified set of regions.
@supports The CSS @supports at-rule lets authors detect support of CSS features directly in CSS.
@viewport Specifies the size, zoom factor, and orientation of the viewport.