Posted by : Rhyf Ahmad Wednesday, May 13, 2015

At-rules are instructions or directives to the CSS parser. They can be used for a variety of purposes. 
The @charset (p. 48) at-rule can be used to specify the character encoding of an external style sheet. It must appear before anything else in the file.
The @import (p. 49) at-rule allows us to import one style sheet into another. All @import at-rules must appear before any rules.

The @media (p. 51) at-rule lets us target rules to the media types we specify.
The @page (p. 52) at-rule can be used to specify margins for paged media. You can set different margins for left- and right-hand pages when you’re printing double-sided pages, as well as for the first page.
The @font-face (p. 54) at-rule allows us to specify custom fonts.
The @namespace (p. 55) at-rule in CSS3 lets us declare an XML namespace, as well as an optional prefix with which that namespace can be specified.

Contents:

@charset
@import
@media
@page
@font-face
@namespace 

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