[css-color] rgba() and hsla() relative colors are valid

[romainmenke]

spec : https://drafts.csswg.org/css-color-5/#relative-RGB

<modern-rgb-syntax> = rgb( [ from <color> ]?
        [ <number> | <percentage> | none]{3}
        [ / [<alpha-value> | none] ]?  )
<modern-rgba-syntax> = rgba( [ from <color> ]?
        [ <number> | <percentage> | none]{3}
        [ / [<alpha-value> | none] ]?  )

<modern-hsl-syntax> = hsl([from <color>]?
          [<hue> | none]
          [<percentage> | <number> | none]
          [<percentage> | <number> | none]
          [ / [<alpha-value> | none] ]? )
<modern-hsla-syntax> = hsla([from <color>]?
        [<hue> | none]
        [<percentage> | <number> | none]
        [<percentage> | <number> | none]
        [ / [<alpha-value> | none] ]? )

This was changes a while ago in : w3c/csswg-drafts@42eaa4d

Discussed here:

• [css-color-5] Clarification of rgb() syntax w3c/csswg-drafts#8231
• [css-color-4] rgba() is legacy so does not support none. Right? w3c/csswg-drafts#7900

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I've edited the test so that it is easier to ensure that rgb and rgba are effectively aliases, same for hsl and hsla

[svgeesus]

Thanks, yes this is consistent with

• [css-color-5] Clarification of rgb() syntax w3c/csswg-drafts#8231 (comment)