[css-grid] Is span keyword excluded from Named Grid Lines <custom-ident>? #494

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1. tomalec commented on Sep 17, 2016

   

   tomalec

   on Sep 17, 2016

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   Or are following valid?

   grid-row: span; 
   grid-column-end: span span 2;
2. mrego commented on Sep 19, 2016

   

   mrego

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   I believe this is already covered at the end of the section:

   In all the above productions, the additionally excludes the keyword span.
3. tomalec commented on Sep 19, 2016

   

   tomalec

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   Wow, that's it, but I didn't and wouldn't expect to see the explanation that far (7.2->9.3).

   Per exceptio probat regulam, should I assume that all following occurrences of <custom-ident> (for example in 9.4) could potential contain span (it's not say they cannot) or are they just references to this specific instance of <custom-ident> that could not.

   If the latter why can we cay that for in all cases <custom-ident> excludes span and if we say so I would rather provide such exception where we introduce it for the first time, not somewhere in the middle.
4. tomalec commented on Sep 19, 2016

   

   tomalec

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   My bad, sorry, It was mentioned closer, in 7.2.

   In <line-names>, the <custom-ident> additionally excludes the keyword span

   But maybe to avoid such confusion, and changing/adding a meaning retrospectively by ."In all the above productions". We could use just (already specified) <line-names> (for all <custom-ident> excluding the keyword span).

   (Note, I'm willing to prepare PR if needed ;) )
5. MatsPalmgren commented on Sep 19, 2016

   

   MatsPalmgren

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   I think this general clause in [css-values] applies:
   https://www.w3.org/TR/css3-values/#custom-idents

   represents any valid CSS identifier that would not be misinterpreted as a pre-defined keyword in that property’s value definition
6. mrego commented on Sep 20, 2016

   

   mrego

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   A few lines later the [css-values] spec says:

   Specifications using must specify clearly what other keywords are excluded from , if any—for example by saying that any pre-defined keywords in that property’s value definition are excluded.

   BTW, I remember a thread about this topic.
7. fantasai

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   css-grid-1

   on Sep 20, 2016
8. fantasai

   added a commit that references this issue on Sep 20, 2016

   [css-grid] Put line-name exclusion in section defining line names. Is…

   ...

   c8ede24
9. fantasai commented on Sep 20, 2016

   

   fantasai

   on Sep 20, 2016

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   A few lines later the [css-values] spec says:

   Which is a conformance criterium on specs, not on implementations. ;)

   We can't use <<line-names>> in place of <<custom-ident>> in section 9 because it includes the surrounding brackets, which aren't included as part of the value syntax in grid-area and its longhands.

   I tweaked the wording of the statement a bit and move it into the line names section, let me know if that helps.
10. fantasai

    closed this as completedon Sep 20, 2016
11. tomalec commented on Sep 21, 2016

    

    tomalec

    on Sep 21, 2016

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    Thanks :)
12. fantasai

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    Closed Accepted as EditorialNo substantive change.No substantive change.

    Commenter SatisfiedCommenter has indicated satisfaction with the resolution / edits.Commenter has indicated satisfaction with the resolution / edits.

    on Oct 17, 2017
13. fantasai

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    Tracked in DoC

    on Jan 22, 2019
14. fantasai

    added this to the css-grid-1 WD 2016-05-19+ milestone on Jan 23, 2019
15. svgeesus

    added a commit that references this issue on Dec 8, 2025

    Merge pull request #494 from danielsakhapov/ray_size_optional

    fa96c17