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npm · #3275 most downloaded on npm
Use space and slash separated color notation in CSS
Last release 3 days ago
02 Oct 2026
Ships fairly regularly
a new release about every 3 weeks
Nearly every release is documented
notes for 60 of the last 60 stable releases
Nothing withdrawn
no release was ever pulled
8 years old
65 releases · first in 2018
Correctly nest conditional rules inside @function instead of cloning the @function rule.
October 2, 2026
@function instead of cloning the @function rule.@csstools/postcss-progressive-custom-properties to 5.1.4 (patch)@csstools/css-color-parser to 4.2.6 (patch)Updated `@csstools/css-parser-algorithms` to `4.0.2` (patch)
October 1, 2026
@csstools/css-parser-algorithms to 4.0.2 (patch)@csstools/css-color-parser to 4.2.5 (patch)One column per quarter.
Updated `@csstools/css-tokenizer` to `4.0.1` (patch)
September 25, 2026
@csstools/css-tokenizer to 4.0.1 (patch)@csstools/css-tokenizer to 4.0.2 (patch)@csstools/css-parser-algorithms to 4.0.1 (patch)@csstools/css-color-parser to 4.2.4 (patch)Updated `@csstools/css-color-parser` to `4.2.3` (patch)
September 13, 2026
@csstools/css-color-parser to 4.2.3 (patch)Updated `@csstools/postcss-progressive-custom-properties` to `5.1.3` (patch)
September 6, 2026
@csstools/postcss-progressive-custom-properties to 5.1.3 (patch)Updated `@csstools/css-color-parser` to `4.2.2` (patch)
August 31, 2026
@csstools/css-color-parser to 4.2.2 (patch)Updated `@csstools/css-color-parser` to `4.2.1` (patch)
August 25, 2026
@csstools/css-color-parser to 4.2.1 (patch)Updated `@csstools/css-color-parser` to `4.2.0` (minor)
August 15, 2026
@csstools/css-color-parser to 4.2.0 (minor)@csstools/postcss-progressive-custom-properties to 5.1.2 (patch)Updated `@csstools/css-color-parser` to `4.1.10` (patch)
July 22, 2026
@csstools/css-color-parser to 4.1.10 (patch)Updated `@csstools/css-color-parser` to `4.1.8` (patch)
June 28, 2026
@csstools/css-color-parser to 4.1.8 (patch)@csstools/css-color-parser to 4.1.9 (patch)@csstools/postcss-progressive-custom-properties to 5.1.1 (patch)Updated `@csstools/css-color-parser` to `4.1.7` (patch)
June 14, 2026
@csstools/css-color-parser to 4.1.7 (patch)Updated `@csstools/postcss-progressive-custom-properties` to `5.1.0` (minor)
May 13, 2026
@csstools/postcss-progressive-custom-properties to 5.1.0 (minor)@csstools/css-color-parser to 4.1.1 (patch)Updated `@csstools/css-color-parser` to `4.1.0` (minor)
April 12, 2026
@csstools/css-color-parser to 4.1.0 (minor)Updated `@csstools/css-color-parser` to `4.0.2` (patch)
February 21, 2026
@csstools/css-color-parser to 4.0.2 (patch)Updated `@csstools/css-color-parser` to `4.0.1` (patch)
January 25, 2026
@csstools/css-color-parser to 4.0.1 (patch)Updated: Support for Node 20.19.0 or later (major).
January 14, 2026
20.19.0 or later (major).commonjs API. In supported Node versions require(esm) will work without needing to make code changes.@csstools/css-tokenizer to 4.0.0 (major)@csstools/utilities to 3.0.0 (major)@csstools/css-parser-algorithms to 4.0.0 (major)@csstools/postcss-progressive-custom-properties to 5.0.0 (major)@csstools/css-color-parser to 4.0.0 (major)Updated `@csstools/postcss-progressive-custom-properties` to `4.2.1` (patch)
September 21, 2025
@csstools/postcss-progressive-custom-properties to 4.2.1 (patch)Updated `@csstools/css-color-parser` to `3.1.0` (minor)
August 22, 2025
@csstools/css-color-parser to 3.1.0 (minor)@csstools/postcss-progressive-custom-properties to 4.2.0 (minor)Updated `@csstools/css-tokenizer` to `3.0.4` (patch)
May 27, 2025
@csstools/css-tokenizer to 3.0.4 (patch)@csstools/postcss-progressive-custom-properties to 4.1.0 (minor)@csstools/css-parser-algorithms to 3.0.5 (patch)@csstools/css-color-parser to 3.0.10 (patch)Updated `@csstools/postcss-progressive-custom-properties` to `4.0.1` (patch)
April 19, 2025
@csstools/postcss-progressive-custom-properties to 4.0.1 (patch)@csstools/css-color-parser to 3.0.9 (patch)Updated `@csstools/css-color-parser` to `3.0.8` (patch)
February 23, 2025
@csstools/css-color-parser to 3.0.8 (patch)Updated `@csstools/css-color-parser` to `3.0.7` (patch)
December 27, 2024
@csstools/css-color-parser to 3.0.7 (patch)Updated `@csstools/css-color-parser` to `3.0.6` (patch)
November 11, 2024
@csstools/css-color-parser to 3.0.6 (patch)Updated `@csstools/css-tokenizer` to `3.0.3` (patch)
November 1, 2024
@csstools/css-tokenizer to 3.0.3 (patch)@csstools/css-parser-algorithms to 3.0.4 (patch)@csstools/css-color-parser to 3.0.5 (patch)Updated `@csstools/css-parser-algorithms` to `3.0.3` (patch)
October 23, 2024
@csstools/css-parser-algorithms to 3.0.3 (patch)@csstools/css-color-parser to 3.0.4 (patch)Updated `@csstools/css-tokenizer` to `3.0.2` (patch)
October 10, 2024
@csstools/css-tokenizer to 3.0.2 (patch)@csstools/css-parser-algorithms to 3.0.2 (patch)@csstools/css-color-parser to 3.0.3 (patch)Updated `@csstools/css-tokenizer` to `3.0.1` (patch)
August 18, 2024
@csstools/css-tokenizer to 3.0.1 (patch)@csstools/css-parser-algorithms to 3.0.1 (patch)@csstools/css-color-parser to 3.0.2 (patch)Updated `@csstools/css-color-parser` to `3.0.1` (patch)
August 14, 2024
@csstools/css-color-parser to 3.0.1 (patch)Updated: Support for Node v18+ (major).
August 3, 2024
@csstools/css-color-parser to 2.0.5 (patch)@csstools/css-tokenizer to 3.0.0 (major)@csstools/utilities to 2.0.0 (major)@csstools/css-parser-algorithms to 3.0.0 (major)@csstools/postcss-progressive-custom-properties to 4.0.0 (major)@csstools/css-color-parser to 3.0.0 (major)Updated `@csstools/postcss-progressive-custom-properties` to `3.3.0` (minor)
July 7, 2024
@csstools/postcss-progressive-custom-properties to 3.3.0 (minor)Updated `@csstools/css-tokenizer` to `2.4.1` (patch)
July 6, 2024
@csstools/css-tokenizer to 2.4.1 (patch)@csstools/css-parser-algorithms to 2.7.1 (patch)@csstools/css-color-parser to 2.0.4 (patch)Updated `@csstools/css-tokenizer` to `2.3.2` (patch)
June 29, 2024
@csstools/css-tokenizer to 2.3.2 (patch)@csstools/css-parser-algorithms to 2.7.0 (minor)@csstools/css-color-parser to 2.0.3 (patch)Updated `@csstools/css-tokenizer` to `2.3.1` (patch)
May 4, 2024
@csstools/css-tokenizer to 2.3.1 (patch)@csstools/css-parser-algorithms to 2.6.3 (patch)@csstools/css-color-parser to 2.0.2 (patch)Updated `@csstools/css-tokenizer` to `2.3.0` (minor)
May 4, 2024
@csstools/css-tokenizer to 2.3.0 (minor)@csstools/css-parser-algorithms to 2.6.2 (patch)@csstools/css-color-parser to 2.0.1 (patch)Updated `@csstools/css-color-parser` to `2.0.0` (major)
April 21, 2024
@csstools/css-color-parser to 2.0.0 (major)Updated `@csstools/postcss-progressive-custom-properties` to `3.2.0` (minor)
March 31, 2024
@csstools/postcss-progressive-custom-properties to 3.2.0 (minor)@csstools/css-color-parser to 1.6.3 (patch)Updated `@csstools/css-color-parser` to `1.6.2` (patch)
March 17, 2024
@csstools/css-color-parser to 1.6.2 (patch)Updated `@csstools/css-tokenizer` to `2.2.4` (patch)
March 13, 2024
@csstools/css-tokenizer to 2.2.4 (patch)@csstools/postcss-progressive-custom-properties to 3.1.1 (patch)@csstools/css-parser-algorithms to 2.6.1 (patch)@csstools/css-color-parser to 1.6.0 (minor)Reuse code with @csstools/utilities
February 19, 2024
@csstools/utilities@csstools/css-parser-algorithms to 2.6.0 (minor)@csstools/postcss-progressive-custom-properties to 3.1.0 (minor)@csstools/css-color-parser to 1.5.2 (patch)Updated `@csstools/css-tokenizer` to `2.2.3` (patch)
December 31, 2023
@csstools/css-tokenizer to 2.2.3 (patch)@csstools/css-parser-algorithms to 2.5.0 (minor)@csstools/css-color-parser to 1.5.1 (patch)Ensure that fallback values are always valid legacy syntax.
December 15, 2023
@csstools/css-tokenizer to 2.2.2 (patch)@csstools/css-parser-algorithms to 2.4.0 (minor)@csstools/postcss-progressive-custom-properties to 3.0.3 (patch)@csstools/css-color-parser to 1.5.0 (minor)Updated `@csstools/postcss-progressive-custom-properties` to `3.0.2` (patch)
October 9, 2023
@csstools/postcss-progressive-custom-properties to 3.0.2 (patch)Updated `@csstools/postcss-progressive-custom-properties` to `3.0.1` (patch)
September 18, 2023
@csstools/postcss-progressive-custom-properties to 3.0.1 (patch)Change license to MIT-0 (read more about this change in the blog post)
July 3, 2023
MIT-0 (read more about this change in the blog post)@csstools/postcss-progressive-custom-properties to 3.0.0 (major)Added @csstools/postcss-progressive-custom-properties for improved support of custom properties.
June 1, 2023
@csstools/postcss-progressive-custom-properties for improved support of custom properties.@csstools/postcss-progressive-custom-properties to 2.3.0 (minor)Reduce the amount of duplicate fallback CSS.
February 6, 2023
Improve types declaration in package.json
January 28, 2023
types declaration in package.jsonUpdated: Support for Node v14+ (major).
January 24, 2023
_July 8, 2022_ - Fix case insensitive matching.
July 8, 2022
Handle modern channel values in legacy notation (comma separated)
May 19, 2022
.color {
color: rgba(0, 255, 0, 50%);
}
/* becomes */
.color {
color: rgba(0, 255, 0, 0.5);
}
Improved es module and commonjs compatibility
February 5, 2022
es module and commonjs compatibilityRemoved Sourcemaps from package tarball.
January 2, 2022
Added: support for Alpha value as the fourth argument in comma separated values notation.
December 27, 2021
Added: support for Alpha value as a CSS variable in rgb() and rgba().
December 15, 2021
rgb() and rgba().Changed: now uses postcss-value-parser for parsing.
December 13, 2021
postcss-value-parser for parsing.preserve: true option.Added: Safeguards against postcss-values-parser potentially throwing an error.
November 18, 2021
Updated: Support for PostCS 8+ (major).
September 17, 2021
_April 25, 2020_ - Updated: Publish
April 25, 2020
Updated: Using walkType to evade walker bug in postcss-values-parser
April 25, 2020
walkType to evade walker bug in postcss-values-parserUpdated: postcss to 7.0.27 (patch)
April 25, 2020
postcss to 7.0.27 (patch)postcss-values-parser to 3.2.0 (minor)Your coding agent can read these notes before it upgrades. Set up the MCP server →