@font-feature-values

The @font-feature-values CSS at-rule lets you use a common name in the font-variant-alternates property for features activated differently in OpenType. This can help simplify your CSS when using multiple fonts.

The @font-feature-values at-rule may be used either at the top level of your CSS or inside any CSS conditional-group at-rule.

Syntax

Feature value blocks

@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, but 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, but 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, but ident2: 2 4 isn't.
@stylistic: Specifies a feature name that will work with the stylistic() functional notation of font-variant-alternates. A stylistic feature value definition allows only one value: ident1: 2 is valid, but ident2: 2 4 isn't.
@styleset: Specifies a feature name that will work with the styleset() functional notation of font-variant-alternates. A styleset feature value definition allows an unlimited number of values: ident1: 2 4 12 1 maps to the OpenType values ss02, ss04, ss12, and ss01. Note that values higher than 99 are valid, but don'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 either one or two values: ident1: 3 maps to cv03=1, and ident2: 2 4 maps to cv02=4, but ident2: 2 4 5 is invalid.

Formal syntax

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

Examples

Using @styleset in a @font-feature-values rule

css

/* At-rule for "nice-style" in Font One */
@font-feature-values Font One {
  @styleset {
    nice-style: 12;
  }
}

/* At-rule for "nice-style" in Font Two */
@font-feature-values Font Two {
  @styleset {
    nice-style: 4;
  }
}

…

/* Apply the at-rules with a single declaration */
.nice-look {
  font-variant-alternates: styleset(nice-style);
}

Specifications

Specification
CSS Fonts Module Level 4 # font-feature-values

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`@font-feature-values`	No	No	34	No	No	9.1	No	No	34	No	9.3	No
`annotation`	No	No	34	No	No	9.1	No	No	34	No	9.3	No
`character-variant`	No	No	34	No	No	9.1	No	No	34	No	9.3	No
`historical-forms`	No	No	34	No	No	9.1	No	No	34	No	9.3	No
`ornaments`	No	No	34	No	No	9.1	No	No	34	No	9.3	No
`styleset`	No	No	34	No	No	9.1	No	No	34	No	9.3	No
`stylistic`	No	No	34	No	No	9.1	No	No	34	No	9.3	No
`swash`	No	No	34	No	No	9.1	No	No	34	No	9.3	No

Docs

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