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CSSFontFeatureValuesMap: clear() method

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The clear() method of the CSSFontFeatureValuesMap interface removes all declarations in the CSSFontFeatureValuesMap.

In this article

Syntax

js

clear()

Parameters

None.

Return value

None (undefined).

Examples

Basic usage

The following example removes all the declarations within the @swash feature block. This example is using @swash but also works with other feature value blocks.

CSS

css
@font-feature-values "MonteCarlo" {
  @swash {
    swishy: 1;
    swashy: 2;
  }
}

JavaScript

js
// get the rules
const myRule = document.styleSheets[0].cssRules[0];
console.log(myRule.swash.size); // logs 2
myRule.swash.clear();
console.log(myRule.swash.size); // logs 0

Specifications

Specification

CSS Fonts Module Level 4
# cssfontfeaturevaluesmap

Browser compatibility

Enable JavaScript to view this browser compatibility table.

See also

Map.prototype.clear()

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This page was last modified on Feb 24, 2026 by MDN contributors.

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