`@font-feature-values` CSS at-rule

Baseline Widely available

This feature is well established and works across many devices and browser versions. It's been available across browsers since March 2023.

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

@font-feature-values Font Name {
  font-display: swap;
  @styleset {
    nice-style: 12;
  }
  @swash {
    fancy: 2;
  }
}

Each @font-feature-values block can contain a list of feature value blocks (listed below), as well as the font-display descriptor.

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

Examples

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

/* 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	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`font-feature-values`	111	111	34	97	9.1	111	34	75	9.3	22.0	111	9.3
`annotation`	111	111	34	97	9.1	111	34	75	9.3	22.0	111	9.3
`character-variant`	111	111	34	97	9.1	111	34	75	9.3	22.0	111	9.3
`historical-forms`	111	111	34	97	9.1	111	34	75	9.3	22.0	111	9.3
`ornaments`	111	111	34	97	9.1	111	34	75	9.3	22.0	111	9.3
`styleset`	111	111	34	97	9.1	111	34	75	9.3	22.0	111	9.3
`stylistic`	111	111	34	97	9.1	111	34	75	9.3	22.0	111	9.3
`swash`	111	111	34	97	9.1	111	34	75	9.3	22.0	111	9.3