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[css-color-4] set chroma to 0 when converting powerless hue to missing #14244

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[css-color-4] set chroma to 0 when converting powerless hue to missing #14244

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001971b
[css-color-4] set chroma to 0 when converting powerless hue to missing
romainmenke Jul 31, 2026
d6a9350
Update css-color-4/Overview.bs
romainmenke Jul 31, 2026
5e8fb4d
describe hwb in pseudo code
romainmenke Aug 2, 2026
bc100f1
clarify applicable value range
romainmenke Aug 14, 2026
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16 changes: 16 additions & 0 deletions css-color-4/Overview.bs
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Expand Up @@ -1293,6 +1293,22 @@ will have a [=powerless=] hue component.
have an <em>extremely small</em> chroma rather than precisely ''0%'';
as a result, the hue component is [=powerless=].

When changing a powerless hue component to a [=missing component=],
the chroma (or other measure of colorfulness, such as saturation in ''hsl''; see [=analogous components=]) is set to zero
to avoid amplifying floating-point noise.
Negative values are not clamped to zero,
this value is only set to zero when it is larger than zero but smaller or equal to ε.
For ''hwb'' follow these steps instead:
<pre>
1. if W + B is greater than or equal to ε and W + B is less than 100
1.1. if W and B are not missing
1.1.1. set B to 100 - W
1.2. else if W is not missing
1.2.1. set W to 100
1.3. else if B is not missing
1.3.1. set B to 100
</pre>

<h3 id=parse-color>
Parsing a <<color>> Value</h3>

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