@import
Baseline
Widely available
*
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
{"* "}Some parts of this feature may have varying levels of support.
概述
@import CSS @ 规则用于从其他样式表导入样式规则。这些规则必须先于所有其他类型的规则，@charset 规则除外；因为它不是一个嵌套语句，@import 不能在条件组的规则中使用。
因此，用户代理可以避免为不支持的媒体类型检索资源，作者可以指定依赖媒体的 @import 规则。这些条件导入在 URI 之后指定逗号分隔的媒体查询。在没有任何媒体查询的情况下，导入是无条件的。指定所有的媒体具有相同的效果。
语法
@import url; @import url list-of-media-queries;
其中：
正规语法
@import =
@import [ <url> | <string> ] [ layer | layer( <layer-name> ) ]? <import-conditions> ;
<url> =
<url()> |
<src()>
<layer-name> =
<ident> [ '.' <ident> ]*
<import-conditions> =
[ supports( [ <supports-condition> | <declaration> ] ) ]? <media-query-list>?
<url()> =
url( <string> <url-modifier>* ) |
<url-token>
<src()> =
src( <string> <url-modifier>* )
<supports-condition> =
not <supports-in-parens> |
<supports-in-parens> [ and <supports-in-parens> ]* |
<supports-in-parens> [ or <supports-in-parens> ]*
<supports-in-parens> =
( <supports-condition> ) |
<supports-feature> |
<general-enclosed>
<supports-feature> =
<supports-decl>
<general-enclosed> =
[ <function-token> <any-value>? ) ] |
[ ( <any-value>? ) ]
<supports-decl> =
( <declaration> )
示例
css
@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);
规范
| Specification |
|---|
| CSS Cascading and Inheritance Level 5 # at-import |
浏览器兼容性
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