src

@font-face 中的src描述符指定了包含字体数据的资源。@font-face 规则中需要指定这个属性。

它的值是一个有优先级的，以逗号分割的外部引用或者本地安装的字体名称。当需要使用字体时，用户代理（指浏览器的意思）将会使用以逗号分隔的参考集中能成功激活的第一个参考值。如果是包含无效数据的字体或者本地的字体资源不存在，用户代理将会忽略当前字体并且加载下一个字体。

与CSS中的其他URL一样，URL可以是相对的，在这种情况下，它相对于包含@ font-face规则的样式表的位置进行解析。对于SVG字体，URL指向文档中定义的包含SVG字体的元素。如果省略元素引用，则默认引用第一个定义字体。同样，字体容器只加载@font-face 规则给定的其中一种字体。片段标识符用于指示要加载的字体。如果容器格式缺少定义的片段标识符方案，将会使用一个简单的基于1的索引方案（e.g., "font-collection#1" for the first font, "font-collection#2" for the second font, etc.）

Related at-rule	`@font-face`
初始值	`n/a (required)`
计算值	as specified

Syntax

/* <url> values */
src: url(https://somewebsite.com/path/to/font.woff); /* Absolute URL */
src: url(path/to/font.woff);                         /* Relative URL */
src: url(path/to/font.woff) format("woff");          /* Explicit format */
src: url('path/to/font.woff');                       /* Quoted URL */
src: url(path/to/svgfont.svg#example);               /* Fragment identifying font */

/* <font-face-name> values */
src: local(font);      /* Unquoted name */
src: local(some font); /* Name containing space */
src: local("font");    /* Quoted name */

/* Multiple items */
src: local(font), url(path/to/font.svg) format("svg"),
     url(path/to/font.woff) format("woff"),
     url(path/to/font.otf) format("opentype");

Values

<url> [ format( <string># ) ]?: Specifies an external reference consisting of a <url>, followed by an optional hint using the format() function to describe the format of the font resource referenced by that URL. The format hint contains a comma-separated list of format strings that denote well-known font formats. If a user agent doesn't support the specified formats, it skips downloading the font resource. If no format hints are supplied, the font resource is always downloaded.
<font-face-name>: Specifies the name of a locally-installed font face using the local() function, which uniquely identifies a single font face within a larger family. The name can optionally be enclosed in quotes.

Formal syntax

[ <url> [ format( <string># ) ]? | local( <family-name> ) ]#where 
<family-name> = <string> | <custom-ident>+

Examples

@font-face {
  font-family: examplefont;
  src: local(Example Font),
       url('examplefont.woff') format("woff"),
       url('examplefont.otf') format("opentype");
}

Specifications

Specification	Status	Comment
CSS Fonts Module Level 3 src	Recommendation	Initial definition

Browser compatibility

BCD tables only load in the browser