Re: [csswg-drafts] [css-color-4] Expand the concept of analogous components to analogous sets of components to minimize `none` → `0` conversions (#10210)

The issue being discussed in #10254 is still outstanding: nothing in the spec says that analogous color components are carried forward for any color conversion *other than* those that occur during interpolation. Currently, the terms "analogous component" and "analogous set" are exclusively referenced in §13 Color Interpolation. As pointed out in https://github.com/w3c/csswg-drafts/issues/10254#issuecomment-2081226505, this implies that carrying forward analogous missing components is not part of the general color conversion process defined in §11 Converting Colors, and so other places where colors may be converted should _not_ carry them forward. This is also stated more or less explicitly in [§4.4](https://drafts.csswg.org/css-color-4/#missing) (emphasis mine):

> For all other purposes, a [missing component](https://drafts.csswg.org/css-color-4/#missing-color-component) behaves as a zero value, in the appropriate unit for that component: `0`, `0%`, or `0deg`. This includes rendering the color directly, **converting it to another color space**, performing computations on the color component values, etc.

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Received on Tuesday, 21 April 2026 19:20:39 UTC