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@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.

/* 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);
}

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 stylset 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 <family-name># {
  <feature-value-block-list>
}

where
<family-name> = <string> | <custom-ident>+
<feature-value-block-list> = <feature-value-block>+

where
<feature-value-block> = <feature-type> { <feature-value-declaration-list> }

where
<feature-type> = @stylistic | @historical-forms | @styleset | @character-variant | @swash | @ornaments | @annotation
<feature-value-declaration-list> = <feature-value-declaration>

where
<feature-value-declaration> = <custom-ident>: <integer>+;

Specifications

Specification Status Comment
CSS Fonts Module Level 3
The definition of '@font-feature-values' in that specification.
Candidate Recommendation Initial definition.

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Basic support No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No No 9.1
@annotation No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No No 9.1
@character-variant No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No No 9.1
@historical-forms No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No No 9.1
@ornaments No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No No 9.1
@styleset No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No No 9.1
@stylistic No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No No 9.1
@swash No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No No 9.1
Mobile
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support No No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No 9.3 No
@annotation No No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No 9.3 No
@character-variant No No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No 9.3 No
@historical-forms No No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No 9.3 No
@ornaments No No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No 9.3 No
@styleset No No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No 9.3 No
@stylistic No No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No 9.3 No
@swash No No No 34
34
24
Disabled
Disabled From version 24: this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No 9.3 No

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/@font-feature-values