Re: [csswg-drafts] [css-color-5] Behavior of `none` in relative color syntax (#10151)

• From: Romain Menke via GitHub <sysbot+gh@w3.org>
• Date: Sun, 14 Apr 2024 19:41:13 +0000
• To: public-css-archive@w3.org
• Message-ID: <issue_comment.created-2054164965-1713123671-sysbot+gh@w3.org>

🤔 But that isn't how these features are currently specified or implemented.

`none` is not a placeholder for the corresponding channel (i.e. `&` in nesting). `none` is a way to make or represent a missing channel. Missing/powerless channels are filled in with the corresponding value from the other color.

This would be a very large change and one that opens up more questions than it answers.

---------

How does it work when channel keywords are used in different positions?

```
color-mix(
  in lab,
  lab(50% none none),
  lab(50% 10% 20%)
)

lab(50% 10% 20%)
```

vs.

```
color-mix(
  in lab,
  lab(from lab(50% none none) l b a),
  lab(50% 10% 20%)
)

lab(50% 10% 20%)
```

vs.

```
color-mix(
  in lab,
  lab(from lab(50% none none) l a b),
  lab(50% 10% 20%)
)

lab(50% 10% 20%)
```

vs.

```
color-mix(
  in lab,
  lab(from lab(50% none none) l calc(b) calc(a)),
  lab(50% 10% 20%)
)

lab(50% 10% 20%)
/* or? */
lab(50% 20% 10%)
```



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Received on Sunday, 14 April 2024 19:41:14 UTC