[csswg-drafts] [css-color-5] Add value multiplier for color-contrast() (#5497)

sangwoo108 has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-color-5] Add value multiplier for color-contrast() ==
https://drafts.csswg.org/css-color-5/#colorcontrast

Hi, all

the second parameter of color-contrast() is a list  of two or more colors. Would it be better if we add value multiplier?

```diff
- color-contrast( <color> vs <color>#  )
+ color-contrast( <color> vs <color>#{2} )
```

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5497 using your GitHub account


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