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Re: [css-counter-styles] About override loop

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Fri, 21 Feb 2014 13:33:29 -0800
Message-ID: <CAAWBYDDOg=fn9EnLCoAG2-m7GzeW0=UV2fB+xCdV4HWxObQS7g@mail.gmail.com>
To: Xidorn Quan <quanxunzhen@gmail.com>
Cc: www-style list <www-style@w3.org>
On Fri, Feb 21, 2014 at 1:13 PM, Xidorn Quan <quanxunzhen@gmail.com> wrote:
> On Saturday, February 22, 2014, Tab Atkins Jr. <jackalmage@gmail.com> wrote:
>> On Mon, Feb 17, 2014 at 4:12 AM, Xidorn Quan <quanxunzhen@gmail.com>
>> wrote:
>> > On Mon, Feb 17, 2014 at 8:23 PM, Xidorn Quan <quanxunzhen@gmail.com>
>> > wrote:
>> >> The current draft doesn't discuss what will happen if there is an
>> >> override loop. However, it is obvious that all styles in an override
>> >> loop should actually override 'decimal', like those override a
>> >> nonexistent style. I just think it is better to mention such case in
>> >> the spec.
>> >
>> > After doing some thinking, I propose that only the descriptor which is
>> > unspecified in all styles in the cycle should fall to 'decimal'.
>> >
>> > For example, if there is three styles: A, B, and C:
>> >
>> > @counter-style A { system: override B; negative: A; }
>> > @counter-style B { system: override C; prefix: B; }
>> > @counter-style C { system: override A; suffix: C; }
>> >
>> > Then all three styles should use 'A' for 'negative', 'B' for 'prefix',
>> > and 'C' for 'suffix', and other descriptors will inherent the value of
>> > 'decimal'.
>>
>> Hm, I think that's more trouble than it's worth.  The cycle is an
>> error in the first place; we *could* try to patch things up and do a
>> minimal amount of failure, but I'd rather just make the entire thing
>> fail in a more obvious fashion.
>
> As it is an error, would you mind leave it for implementations to decide how
> to deal with it?

No, errors have to be specified just as precisely as correct behavior.

Is it easier to handle it in the way you suggest?  I would think it's
easier to just detect a cycle and then adjust the internal 'system'
value of all of the offending counter styles to override decimal
instead.  Then there's no special behavior.

~TJ
Received on Friday, 21 February 2014 21:34:17 UTC

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