CSSFontFeatureValuesRule
The CSSFontFeatureValuesRule interface represents an @font-feature-values at-rule, letting developers assign for each font face a common name to specify features indices to be used in font-variant-alternates.
Properties
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The fontFamily property of the CSSConditionRule interface represents the name of the font family it applies to.
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The parentRule property of the CSSRule interface returns the containing rule of the current rule if this exists, or otherwise returns null.
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The parentStyleSheet property of the CSSRule interface returns the StyleSheet object in which the current rule is defined.