[css-conditional-5] Multiple `@supports-condition` with the same name

[cdoublev]

Multiple @supports-condition rules with the same name in a style sheet are invalid and must be ignored.

If I am picky, this is slightly ambiguous: only consecutive rules must be ignored, I guess.

But is this intentional?

• @color-profile: unspecified
• @counter-style: the last one wins
• @font-palette-values: unspecified
• @function: the last one wins
• @keyframes: the last one wins
• @property: the last one wins
• @position-try: the last one wins

[SebastianZ]

I have to admit that I didn't check how other naming at-rules are defined when introducing @supports-condition. It definitely makes sense to align it with the other rules. So I've created #12976 to change the definition accordingly.

@cdoublev I think you meant @color-profile with the first rule, right?
Anyway, it sounds like there should be a centralized definition for name conflicts on naming at-rules, so all of them can refer to it. And if a rule needs special handling for whatever reason, it can still be defined differently.

Sebastian

[cdoublev]

Yes, I meant @color-profile. Thanks for the PR and follow-up. 👍

[svgeesus]

I made the same change to clarify @color-profile and @font-palette-values:

• [css-color-5] Multiple @color-profile with the same name #12980
• [css-fonts-4] Multiple @font-palette-values with the same name #12981