Re: [csswg-drafts] [css-color] Clarification needed on how missing alpha components flow through relative color syntax for hsl/hwb (#10254)

I think this is from [4.1. Processing Model for Relative Colors ](https://drafts.csswg.org/css-color-5/#rcs-intro):

> If the alpha value of the relative color is omitted, it defaults to that of the [origin color](https://drafts.csswg.org/css-color-5/#origin-color) (rather than defaulting to 100%, as it does in the absolute syntax).

> Missing components are handled the same way as with [CSS Color 4 ยง 12.2 Interpolating with Missing Components](https://drafts.csswg.org/css-color-4/#interpolation-missing): the origin colorspace and the relative function colorspace are checked for [analogous components](https://drafts.csswg.org/css-color-4/#analogous-components) which are then [carried forward](https://drafts.csswg.org/css-color-4/#carried-forward) as missing.

Aha! It is implied, but not directly stated, that alpha is analogous to alpha.

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Received on Friday, 26 April 2024 18:11:00 UTC