CSSFontFeatureValuesRule

Baseline 2023 *

Newly available

Since March 2023, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

* Some parts of this feature may have varying levels of support.

The CSSFontFeatureValuesRule interface represents an @font-feature-valuesat-rule, letting developers assign for each font face a common name to specify features indices to be used in font-variant-alternates.

Instance properties

Inherits properties from its ancestor CSSRule.

CSSFontFeatureValuesRule.fontFamily: A string that identifies the font family this rule applies to.

Instance methods

Inherits methods from its ancestor CSSRule.

Examples

Read font family

In this example, we declare two @font-feature-values one for the Font One font family, and the other for Font Two. We then use the CSSOM to read these font families, displaying them into the log.

HTML

html

<pre id="log"></pre>

CSS

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); }

JavaScript

const log = document.getElementById("log"); const rules = document.styleSheets[document.styleSheets.length - 1].cssRules; const fontOne = rules[0]; // A CSSFontFeatureValuesRule log.textContent = `The 1st '@font-feature-values' family: "${fontOne.fontFamily}".\n`; const fontTwo = rules[1]; // Another CSSFontFeatureValuesRule log.textContent += `The 2nd '@font-feature-values' family: "${fontTwo.fontFamily}".`;

Specifications

Specification
CSS Fonts Module Level 4 # cssfontfeaturevaluesrule