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Re: [css-counter-styles] interaction between 'negative' and 'pad' descriptors

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Wed, 13 Aug 2014 10:31:14 -0700
Message-ID: <CAAWBYDCrDz-rpgbkZhOWw7MyYtDKf5kN_P7Yj98iOCKFvLo-_Q@mail.gmail.com>
To: "L. David Baron" <dbaron@dbaron.org>
Cc: www-style list <www-style@w3.org>
On Thu, Apr 24, 2014 at 3:36 PM, L. David Baron <dbaron@dbaron.org> wrote:
> Two parts of the spec say inconsistent things about the interaction
> of the 'negative' and 'pad' descriptors.
>
> I will explain both of them in terms of how they apply to the
> definition of decimal-leading-zero in
> http://dev.w3.org/csswg/css-counter-styles/#simple-numeric , which
> has effectively:
>   pad: 2 '0';
>   negative: '-';
>
> http://dev.w3.org/csswg/css-counter-styles/#generate-a-counter says
> that 'pad' is applied first, and this is done by:
>   # 4. If the representation uses less symbols than specified in
>   #    the counter style’s pad descriptor, prepend symbols to the
>   #    representation as specified in the pad descriptor.
>
> On the other hand,
> http://dev.w3.org/csswg/css-counter-styles/#counter-style-pad says:
>   # If the counter value is negative and the counter style is
>   # negative-capable, further reduce difference by the number of
>   # grapheme clusters in the counter style’s negative descriptor’s
>   # <symbol>(s).
>
> It seems both that these should be consistent, and that this
> shouldn't be defined in two places.
>
> I'd note that the testcase
>   data:text/html,<ol start="-1" style="list-style-type:decimal-leading-zero"><li><li><li></ol>
> behaves differently in Firefox and Chrome.

Though I'd marked this as accepted in the DoC, I hadn't actually fixed
it.  Done now - I removed the first clause from the line in "generate
a counter style", so it always goes down to 'pad'  and does all the
necessary checks.

~TJ
Received on Wednesday, 13 August 2014 17:32:09 UTC

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