@font-feature-values

@font-feature-values CSS at-rule 允许作者在font-variant-alternates 中使用通用名称，用于在 OpenType 中以不同方式激活功能。它允许在使用几种字体时简化 CSS。

@font-feature-values Font One {
  /* How to activate nice-style in Font One */
  @styleset {
    nice-style: 12;
  }
}

@font-feature-values Font Two {
  /* How to activate nice-style in Font Two */
  @styleset {
    nice-style: 4;
  }
}

/* … */

.nice-look {
  font-variant-alternates: styleset(nice-style);
} /* Independent of the font */

The @font-feature-values at-rule may be used at the top level of a CSS, but also inside any CSS conditional-group at-rule.

@swash

Specifies a feature name that will work with the swash() functional notation of font-variant-alternates. A swash feature value definition allows only one value: ident1: 2 is valid when ident2: 2 4 isn't.

@annotation

Specifies a feature name that will work with the annotation() functional notation of font-variant-alternates. An annotation feature value definition allows only one value: ident1: 2 is valid when ident2: 2 4 isn't.

@ornaments

Specifies a feature name that will work with the ornaments() functional notation of font-variant-alternates. An ornaments feature value definition allows only one value: ident1: 2 is valid when ident2: 2 4 isn't.

@stylistic

Specifies a feature name that will work with the stylistic() functional notation of font-variant-alternates. A stylistice feature value definition allows only one value: ident1: 2 is valid when ident2: 2 4 isn't.

@styleset

Specifies a feature name that will work with the styleset() functional notation of font-variant-alternates. A stylset feature value definition allows and illimited amount of values: ident1: 2 4 12 1maps to the OpenType values ss02, ss04, ss12, ss01. Note that values higher than 99 are valid, but doesn't map to any OpenType values and are ignored.

@character-variant

Specifies a feature name that will work with the character-variant() functional notation of font-variant-alternates. A character-variant feature value definition allows one or two values: ident1: 2 maps to cv02=1 and ident2: 2 4 maps to cv02)4 and ident2: 2 4 5 isn't valid.

@font-feature-values = 
  @font-feature-values <family-name># { <declaration-rule-list> }  

<family-name> = 
  <string>         |
  <custom-ident>+  

• The font-variant-alternates property that uses values that this at-rule defines.