- From: Sam Weinig via GitHub <sysbot+gh@w3.org>
- Date: Fri, 31 Dec 2021 17:48:09 +0000
- To: public-css-archive@w3.org
> There is no "other color" here so we have lab(0% 0 0) and 0 / 2 = 0
There is a small argument for having some way to preserve the "missing" concept into `calc()` so that users could match the interpolation rules the engine uses in a custom interpolation they might implement using the relative color syntax:
```css
lab(from var(--my-color)
calc((1 - var(--progress-l)) * l + (var(--progress-l) * var(--other-color-l))
calc((1 - var(--progress-a)) * a + (var(--progress-a) * var(--other-color-a))
calc((1 - var(--progress-b)) * b + (var(--progress-b) * var(--other-color-b)) );
```
In the above, if one of the components was 'none', what the user probably really wanted was to just the other component, but if they always lose that information they are out of luck.
Admittedly, this example seems a bit far fetched and would probably require some new functionality in calc to conditionally do the behavior wanted, but I thought I would call it out in case you had any interesting ideas here. (Unrelated, should calc() have a `lerp()` builtin :) ?)
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Received on Friday, 31 December 2021 17:48:11 UTC