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

From: L. David Baron <dbaron@dbaron.org>
Date: Thu, 24 Apr 2014 15:45:32 -0700
To: www-style@w3.org
Message-ID: <20140424224532.GA30543@crum.dbaron.org>
On Thursday 2014-04-24 15:36 -0700, L. David Baron 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: '-';

Oops, I forgot to actually do this explanation.

> 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. 

This implies that the decimal-leading-zero style for -1 is the
string "-01", which matches Chrome.

> 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).

This implies that the decimal-leading-zero style for -1 is the
string "-1", which matches Firefox.

-David

-- 
𝄞   L. David Baron                         http://dbaron.org/   𝄂
𝄢   Mozilla                          https://www.mozilla.org/   𝄂
             Before I built a wall I'd ask to know
             What I was walling in or walling out,
             And to whom I was like to give offense.
               - Robert Frost, Mending Wall (1914)

Received on Thursday, 24 April 2014 22:45:56 UTC

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