@import
Syntax
@import url;
@import url list-of-media-queries;
@import url supports( supports-query );
@import url supports( supports-query ) list-of-media-queries;
where:
- url
-
Is a
<string>
or a<url>()
representing the location of the resource to import. The URL may be absolute or relative. - 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 of these queries, it does not load the linked resource.
- supports-query
-
Is either a
<supports-condition>
or a<declaration>
.
Description
Imported 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 URL. In the absence of any media query, the import is unconditional. Specifying all
for the medium has the same effect.
Formal syntax
@import [ <string> | <url> ] [ layer | layer(<layer-name>) ]? [ supports( [ <supports-condition> | <declaration> ] ) ]? <media-query-list>? ;where
<supports-condition> = not <supports-in-parens> | <supports-in-parens> [ and <supports-in-parens> ]* | <supports-in-parens> [ or <supports-in-parens> ]*
<media-query-list> = <media-query>#where
<supports-in-parens> = ( <supports-condition> ) | <supports-feature> | <general-enclosed>
<media-query> = <media-condition> | [ not | only ]? <media-type> [ and <media-condition-without-or> ]?where
<supports-feature> = <supports-decl> | <supports-selector-fn>
<general-enclosed> = [ <function-token> <any-value> ) ] | ( <ident> <any-value> )
<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
<supports-decl> = ( <declaration> )
<supports-selector-fn> = selector( <complex-selector> )
<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
<complex-selector> = <compound-selector> [ <combinator>? <compound-selector> ]*
<media-feature> = ( [ <mf-plain> | <mf-boolean> | <mf-range> ] )where
<compound-selector> = [ <type-selector>? <subclass-selector>* [ <pseudo-element-selector> <pseudo-class-selector>* ]* ]!
<combinator> = '>' | '+' | '~' | [ '||' ]
<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
<type-selector> = <wq-name> | <ns-prefix>? '*'
<subclass-selector> = <id-selector> | <class-selector> | <attribute-selector> | <pseudo-class-selector>
<pseudo-element-selector> = ':' <pseudo-class-selector>
<pseudo-class-selector> = ':' <ident-token> | ':' <function-token> <any-value> ')'
<mf-name> = <ident>
<mf-value> = <number> | <dimension> | <ident> | <ratio>where
<wq-name> = <ns-prefix>? <ident-token>
<ns-prefix> = [ <ident-token> | '*' ]? |
<id-selector> = <hash-token>
<class-selector> = '.' <ident-token>
<attribute-selector> = '[' <wq-name> ']' | '[' <wq-name> <attr-matcher> [ <string-token> | <ident-token> ] <attr-modifier>? ']'where
<attr-matcher> = [ '~' | | | '^' | '$' | '*' ]? '='
<attr-modifier> = i | s
Examples
Importing CSS rules
@import 'custom.css';
@import url("chrome://communicator/skin/");
Importing CSS rules conditionally
@import url("fineprint.css") print;
@import url("bluish.css") speech;
@import "common.css" screen;
@import url('landscape.css') screen and (orientation:landscape);
Specifications
Specification |
---|
CSS Cascading and Inheritance Level 3 # at-import |
Browser compatibility
BCD tables only load in the browser