CSS Color 4 test coverage report

2024-02-07

Prepared by:
Chris Lilley (W3C)

1. Introduction

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This section is not normative, it does not need tests.

1.1. Value Definitions

2. Color Terminology

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This section provides definitions used later, it does not need tests.

3. Applying Color in CSS

3.1. Accessibility and Conveying Information By Color

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This section provides authoring guidance, it does not need tests.

3.2. Foreground Color: the color property

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3.3. Transparency: the opacity property

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3.4. Color Space of Tagged Images

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3.5. Color Spaces of Untagged Colors

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4. Representing Colors: the <color> type

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This section describes a type, it is primarily tested where that type is used.

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4.1. The <color> syntax

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This section provides definitions used later, it does not need tests.

4.1.1. Modern (Space-separated) Color Function Syntax

4.1.2. Legacy (Comma-separated) Color Function Syntax

4.2. Representing Transparency in Colors: the <alpha-value> syntax

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This section provides definitions used later, it does not need tests.

4.3. Representing Cylindrical-coordinate Hues: the <hue> syntax

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This section provides definitions used later, it does not need tests.

4.4. “Missing” Color Components and the none Keyword

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4.4.1. “Powerless” Color Components

4.5. Parsing a <color> Value

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This section provides a definition referenced elsewhere, it does not need tests.

5. sRGB Colors

5.1. The RGB functions: rgb() and rgba()

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5.2. The RGB Hexadecimal Notations: #RRGGBB

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6. Color Keywords

6.1. Named Colors

For historical reasons, this is also referred to as the X11 color set.
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6.3. The transparent keyword

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6.4. The currentcolor keyword

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7. HSL Colors: hsl() and hsla() functions

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7.1. Converting HSL Colors to sRGB

7.2. Converting sRGB Colors to HSL

7.3. Examples of HSL Colors

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This section is not normative, it does not need tests.

8. HWB Colors: hwb() function

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8.1. Converting HWB Colors to sRGB

8.2. Converting sRGB Colors to HWB

8.3. Examples of HWB Colors

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This section is not normative, it does not need tests.

9. Device-independent Colors: CIE Lab and LCH, Oklab and Oklch

9.1. CIE Lab and LCH

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This section is not normative, it does not need tests.

9.2. Oklab and Oklch

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This section is not normative, it does not need tests.

9.3. Specifying Lab and LCH: the lab() and lch() functional notations

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9.4. Specifying Oklab and Oklch: the oklab() and oklch() functional notations

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9.5. Converting Lab or Oklab colors to LCH or Oklch colors

9.6. Converting LCH or Oklch colors to Lab or Oklab colors

10. Predefined Color Spaces

10.1. Specifying Predefined Colors: the color() function

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10.2. The Predefined sRGB Color Space: the sRGB keyword

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10.3. The Predefined Linear-light sRGB Color Space: the srgb-linear keyword

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10.4. The Predefined Display P3 Color Space: the display-p3 keyword

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10.5. The Predefined A98 RGB Color Space: the a98-rgb keyword

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10.6. The Predefined ProPhoto RGB Color Space: the prophoto-rgb keyword

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10.7. The Predefined ITU-R BT.2020-2 Color Space: the rec2020 keyword

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10.8. The Predefined CIE XYZ Color Spaces: the xyz-d50, xyz-d65, and xyz keywords

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10.9. Converting Predefined Color Spaces to Lab or Oklab

10.10. Converting Lab or Oklab to Predefined RGB Color Spaces

10.11. Converting Between Predefined RGB Color Spaces

10.12. Simple Alpha Compositing

11. Converting Colors

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This section provides an algorithm used later, it does not need tests.

12. Color Interpolation

12.1. Color Space for Interpolation

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12.2. Interpolating with Missing Components

12.3. Interpolating with Alpha

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12.4. Hue Interpolation

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12.4.1.

12.4.2.

12.4.3.

12.4.4.

13. Gamut Mapping

13.1. An Introduction to Gamut Mapping

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This section is not normative, it does not need tests.

13.1.1. Clipping

13.1.2. Closest Color (MINDE)

13.1.3. Chroma Reduction

13.1.4. Excessive Chroma Reduction

13.1.5. Chroma Reduction with Local Clipping

13.1.6. Deviations from Perceptual Uniformity: Hue Curvature

13.2. CSS Gamut Mapping to an RGB Destination

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Used values of color are not exposed to script, making this hard to test in an automated manner.

13.2.1. Sample Pseudocode for the Binary Search Gamut Mapping Algorithm with Local MINDE

14. Resolving <color> Values

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14.1. Resolving sRGB values

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14.2. Resolving Lab and LCH values

14.3. Resolving Oklab and Oklch values

14.4. Resolving values of the color() function

14.5. Resolving other colors

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15. Serializing <color> Values

15.1. Serializing alpha values

15.2. Serializing sRGB values

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15.3. Serializing Lab and LCH values

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15.4. Serializing Oklab and Oklch values

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15.5. Serializing values of the color() function

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15.6. Serializing other colors

16. Default Style Rules

17. Sample code for Color Conversions

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This section is not normative, it does not need tests.

18. Sample Code for ΔE2000 and ΔEOK Color Differences

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This section is not normative, it does not need tests.

18.1. ΔE2000

18.2. ΔEOK

Appendix A: Deprecated CSS System Colors

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Results on these 'same as' equivalence tests are not great, which is why the feature is at-risk

Appendix B: Deprecated Quirky Hex Colors

Acknowledgments

Changes

Changes since the Candidate Recommendation Draft of 1 November 2022

Changes since the Candidate Recommendation of 5 July 2022

Changes since the Working Draft of 28 June 2022

Changes since the Working Draft of 28 April 2022

Changes since the Working Draft of 15 December 2021

Changes since the Working Draft of 1 June 2021

Changes since the Working Draft of 12 November 2020

Changes since Working Draft of 5 November 2019

Changes since Working Draft of 05 July 2016

Changes from Colors 3

19. Security Considerations

20. Privacy Considerations

21. Accessibility Considerations