Re: [csswg-drafts] [css-color-4] `<hue> | none` is redundant (#7816)

In contrast, note that [the definition of `<alpha-value>`](https://www.w3.org/TR/css-color-4/#typedef-alpha-value) is not written that way:
```
<alpha-value> = <number> | <percentage>
```

This, I presume, is at least in part because `<alpha-value>` is the value of the [`opacity` property](https://www.w3.org/TR/css-color-4/#propdef-opacity) and `opacity: none` is invalid.

Thus, all the definitions that use `[<alpha-value> | none]` are accurate.

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Received on Saturday, 1 October 2022 22:20:26 UTC