@import

The @import CSS at-rule is used to import style rules from other style sheets. These rules must precede all other types of rules, except @charset rules; as it is not a nested statement, @import cannot be used inside conditional group at-rules.

So that user agents can avoid retrieving resources for unsupported media types, authors may specify media-dependent @import rules. These conditional imports specify comma-separated media queries after the URI. In the absence of any media query, the import is unconditional. Specifying all for the medium has the same effect.

Syntax

@import url;
@import url list-of-media-queries;

where:

url

Is a <string> or a <uri> representing the location of the resource to import. The URL may be absolute or relative. Note that the URL need not actually specify a file; it can just specify the package name and part, and the appropriate file is chosen automatically (e.g. chrome://communicator/skin/). See here for more information.

list-of-media-queries

Is a comma-separated list of media queries conditioning the application of the CSS rules defined in the linked URL. If the browser does not support any these queries, it does not load the linked resource.

Formal syntax

@import [ <string> | <url> ] [ <media-query-list> ]?;
where 
<media-query-list> = <media-query>#
where 
<media-query> = <media-condition> | [ not | only ]? <media-type> [ and <media-condition-without-or> ]?
where 
<media-condition> = <media-not> | <media-and> | <media-or> | <media-in-parens>
<media-type> = <ident>
<media-condition-without-or> = <media-not> | <media-and> | <media-in-parens>
where 
<media-not> = not <media-in-parens>
<media-and> = <media-in-parens> [ and <media-in-parens> ]+
<media-or> = <media-in-parens> [ or <media-in-parens> ]+
<media-in-parens> = ( <media-condition> ) | <media-feature> | <general-enclosed>
where 
<media-feature> = ( [ <mf-plain> | <mf-boolean> | <mf-range> ] )
<general-enclosed> = [ <function-token> <any-value> ) ] | ( <ident> <any-value> )
where 
<mf-plain> = <mf-name> : <mf-value>
<mf-boolean> = <mf-name>
<mf-range> = <mf-name> [ '<' | '>' ]? '='? <mf-value> | <mf-value> [ '<' | '>' ]? '='? <mf-name> | <mf-value> '<' '='? <mf-name> '<' '='? <mf-value> | <mf-value> '>' '='? <mf-name> '>' '='? <mf-value>
where 
<mf-name> = <ident>
<mf-value> = <number> | <dimension> | <ident> | <ratio>

Examples

@import url("fineprint.css") print;
@import url("bluish.css") projection, tv;
@import 'custom.css';
@import url("chrome://communicator/skin/");
@import "common.css" screen, projection;
@import url('landscape.css') screen and (orientation:landscape);

Specifications

Specification	Status	Comment
CSS Cascading and Inheritance Level 3 The definition of '@import' in that specification.	Candidate Recommendation
Media Queries The definition of '@import' in that specification.	Recommendation	Extended the syntax to support any media query and not only simple media types.
CSS Level 2 (Revision 1) The definition of '@import' in that specification.	Recommendation	Added support for <string> to denote the url of a stylesheet, and requirement to insert the @import rule at the beginning of the CSS document.
CSS Level 1 The definition of '@import' in that specification.	Recommendation	Initial definition

Browser compatibility