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[minify] Minify CSS relative colors

area: minifierIssues related to the minifier (`csskit min`)Issues related to the minifier (`csskit min`)

baseline: widely availableAll major browsers have implemented this, so we should too!All major browsers have implemented this, so we should too!

complexity: mediumThis seems quite complex, it might require more time spent than a single engineering session.This seems quite complex, it might require more time spent than a single engineering session.

enhancementNew feature or requestNew feature or request

impact: some StyleValuesA few StyleValues need this, so it might unlock a set of functionality for us.A few StyleValues need this, so it might unlock a set of functionality for us.

popularity: mediumUsage stats are >10% & <50% of pages, which means authors use it a bit. This is worth looking at.Usage stats are >10% & <50% of pages, which means authors use it a bit. This is worth looking at.

Status: Open.

#872 In csskit/csskit;

· yisibl opened on Feb 9, 2026

Implement <code>color-mix</code>

area: hirThis issue is related to the HIRs (css_ast, csskit_ast).This issue is related to the HIRs (css_ast, csskit_ast).

baseline: widely availableAll major browsers have implemented this, so we should too!All major browsers have implemented this, so we should too!

complexity: highThis seems very complex to implement. May require many changes to various parts.This seems very complex to implement. May require many changes to various parts.

impact: many StyleValuesLots of style values need this feature! A sign it will help us unlock a lot of work.Lots of style values need this feature! A sign it will help us unlock a lot of work.

popularity: mediumUsage stats are >10% & <50% of pages, which means authors use it a bit. This is worth looking at.Usage stats are >10% & <50% of pages, which means authors use it a bit. This is worth looking at.

requires explorationMore exploration is required before this should be worked on.More exploration is required before this should be worked on.

Status: Open.

#871 In csskit/csskit;

· keithamus opened on Feb 9, 2026

[minify] Fully check the compression of CSS color

area: minifierIssues related to the minifier (`csskit min`)Issues related to the minifier (`csskit min`)

requires explorationMore exploration is required before this should be worked on.More exploration is required before this should be worked on.

Status: Open.

#870 In csskit/csskit;

· yisibl opened on Feb 9, 2026

[minify] Improved support for the SVG “data” URL scheme

Status: Open.

#869 In csskit/csskit;

· yisibl opened on Feb 9, 2026

[Format] always leave a space after the colon in CSS declarations

area: minifierIssues related to the minifier (`csskit min`)Issues related to the minifier (`csskit min`)

baseline: widely availableAll major browsers have implemented this, so we should too!All major browsers have implemented this, so we should too!

complexity: mediumThis seems quite complex, it might require more time spent than a single engineering session.This seems quite complex, it might require more time spent than a single engineering session.

impact: many StyleValuesLots of style values need this feature! A sign it will help us unlock a lot of work.Lots of style values need this feature! A sign it will help us unlock a lot of work.

popularity: very highUsage stats are >50% of pages, which means a lot of pages implement this, so we should too!Usage stats are >50% of pages, which means a lot of pages implement this, so we should too!

Status: Open.

#859 In csskit/csskit;

· yisibl opened on Feb 3, 2026

Implement css-images-4 <code>&lt;image&gt;</code> types

area: hirThis issue is related to the HIRs (css_ast, csskit_ast).This issue is related to the HIRs (css_ast, csskit_ast).

baseline: widely availableAll major browsers have implemented this, so we should too!All major browsers have implemented this, so we should too!

complexity: mediumThis seems quite complex, it might require more time spent than a single engineering session.This seems quite complex, it might require more time spent than a single engineering session.

help wantedExtra attention is neededExtra attention is needed

impact: one StyleValuesThis feature is only used in one StyleValue. It might not be the highest priority because of this.This feature is only used in one StyleValue. It might not be the highest priority because of this.

popularity: very highUsage stats are >50% of pages, which means a lot of pages implement this, so we should too!Usage stats are >50% of pages, which means a lot of pages implement this, so we should too!

Status: Open.

#845 In csskit/csskit;

· yisibl opened on Jan 29, 2026

Add Prettier to the playground for comparison

area: websiteThis is a bug related to the website, not the main packages.This is a bug related to the website, not the main packages.

complexity: mediumThis seems quite complex, it might require more time spent than a single engineering session.This seems quite complex, it might require more time spent than a single engineering session.

enhancementNew feature or requestNew feature or request

help wantedExtra attention is neededExtra attention is needed

Status: Open.

#842 In csskit/csskit;

· yisibl opened on Jan 28, 2026

Minify the zero value in flex properties

area: minifierIssues related to the minifier (`csskit min`)Issues related to the minifier (`csskit min`)

baseline: widely availableAll major browsers have implemented this, so we should too!All major browsers have implemented this, so we should too!

complexity: mediumThis seems quite complex, it might require more time spent than a single engineering session.This seems quite complex, it might require more time spent than a single engineering session.

Extended RoadmapThis is a feature that we'll someday introduce.This is a feature that we'll someday introduce.

help wantedExtra attention is neededExtra attention is needed

impact: one StyleValuesThis feature is only used in one StyleValue. It might not be the highest priority because of this.This feature is only used in one StyleValue. It might not be the highest priority because of this.

popularity: very highUsage stats are >50% of pages, which means a lot of pages implement this, so we should too!Usage stats are >50% of pages, which means a lot of pages implement this, so we should too!

requires explorationMore exploration is required before this should be worked on.More exploration is required before this should be worked on.

Status: Open.

#840 In csskit/csskit;

· yisibl opened on Jan 28, 2026

Minify the zero &lt;length&gt; in CSS functions

area: hirThis issue is related to the HIRs (css_ast, csskit_ast).This issue is related to the HIRs (css_ast, csskit_ast).

baseline: widely availableAll major browsers have implemented this, so we should too!All major browsers have implemented this, so we should too!

complexity: highThis seems very complex to implement. May require many changes to various parts.This seems very complex to implement. May require many changes to various parts.

impact: many StyleValuesLots of style values need this feature! A sign it will help us unlock a lot of work.Lots of style values need this feature! A sign it will help us unlock a lot of work.

popularity: very highUsage stats are >50% of pages, which means a lot of pages implement this, so we should too!Usage stats are >50% of pages, which means a lot of pages implement this, so we should too!

Status: Open.

#839 In csskit/csskit;

· yisibl opened on Jan 28, 2026

Generate a cool preview card for playground links

complexity: highThis seems very complex to implement. May require many changes to various parts.This seems very complex to implement. May require many changes to various parts.

enhancementNew feature or requestNew feature or request

help wantedExtra attention is neededExtra attention is needed

Status: Open.

#822 In csskit/csskit;

· keithamus opened on Jan 21, 2026

Todo: Minify redundant shorthand values

area: minifierIssues related to the minifier (`csskit min`)Issues related to the minifier (`csskit min`)

complexity: mediumThis seems quite complex, it might require more time spent than a single engineering session.This seems quite complex, it might require more time spent than a single engineering session.

enhancementNew feature or requestNew feature or request

impact: some StyleValuesA few StyleValues need this, so it might unlock a set of functionality for us.A few StyleValues need this, so it might unlock a set of functionality for us.

minorThis label can be applied to PRs to make this a minor releaseThis label can be applied to PRs to make this a minor release

popularity: very highUsage stats are >50% of pages, which means a lot of pages implement this, so we should too!Usage stats are >50% of pages, which means a lot of pages implement this, so we should too!

Status: Open.

#779 In csskit/csskit;

· keithamus opened on Jan 2, 2026

Implement a default csskit rules sheet

area: linterIssues related to the Linter (`csskit check`).Issues related to the Linter (`csskit check`).

Status: Open.

#776 In csskit/csskit;

· keithamus opened on Jan 2, 2026