w3c / w3c/csswg-drafts

Centralize definition for name conflict handling of naming at-rules

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Description

As @cdoublev pointed out in #12973, most of the at-rules that define a name have a definition that indicates that the last one wins. Though there are currently a few at-rules like @color-profile and @font-palette-values, for which handling of duplicate names is undefined.

Therefore, I think we should establish a general term for these name-defining at-rules and centralize the definition for name conflict handling, so all those rules can refer to it.

I am not sure where that definition could live. We currently have one for at-rules in general in CSS Syntax 3, but that might not be the best place for a definition like that.

Sebastian

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Research direction

Start with the CSS Syntax 3 definition of at-rules and the linked CSS Color 5 and CSS Fonts 4 sections for @color-profile and @font-palette-values. Determine where a general term for name-defining at-rules belongs and how duplicate-name handling should be centralized. Done means the definition has an agreed location and the relevant rules can refer to it consistently.

Written by the indexing model from the issue text.

Assessment

Tech stack
css
Domain
documentation
Issue type
Documentation
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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