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Re: [CSS21][css3-content] quotes nesting level

From: Anton Prowse <prowse@moonhenge.net>
Date: Sun, 08 Jan 2012 12:56:42 +0100
Message-ID: <4F09847A.1090105@moonhenge.net>
To: "www-style@w3.org" <www-style@w3.org>
CC: "L. David Baron" <dbaron@dbaron.org>, Simon Sapin <simon.sapin@kozea.fr>
On 06/12/2011 18:01, L. David Baron wrote:
> On Monday 2011-12-05 17:51 +0100, Simon Sapin wrote:
>> Both section 12.3.2 of CSS 2.1 and section 4.1 of Generated Content
>> 3 use the same text to describe the quotes nesting level for the
>> `quotes` property and the `open-quote` and `close-quote` values of
>> the `content` property:
>>
>> """
>> ‘Open-quote’ refers to the first of a pair of quotes, ‘close-quote’
>> refers to the second. Which pair of quotes is used depends on the
>> nesting level of quotes: the number of occurrences of ‘open-quote’
>> in all generated text before the current occurrence, minus the
>> number of occurrences of ‘close-quote’. If the depth is 0, the first
>> pair is used, if the depth is 1, the second pair is used, etc. If
>> the depth is greater than the number of pairs, the last pair is
>> repeated.
>> """
>>
>> For the quotes to be balanced and match the examples, the nesting
>> level should be more accurately described as:
>>
>> the number of occurrences of ‘open-quote’ in all generated text
>> before the current occurrence *excluding the current occurrence*,
>> minus the number of occurrences of ‘close-quote’ before the current
>> occurrence *including the current occurrence*.
>>
>> Of course this sentence is much too heavy but I couldn’t find a
>> better way to explain it in prose.
>
> I think either way is only an approximation of the rules, since
> neither one accounts for the rule (at the end of the same paragraph,
> in CSS 2.1) that describes what happens when the quotes nesting
> level is attempted to be reduced below 0.  I think it might make
> more sense to reword things so that part of the paragraph is an
> approximate summary of the behavior, followed by an exact set of
> rules.  For example:
>
>    'Open-quote' refers to the first of a pair of quotes,
>    'close-quote' refers to the second. Which pair of quotes is used
>    depends on the nesting level of quotes.  The nesting level begins
>    at 0 at the start of the document, and then, by a depth-first
>    traversal of the document, it is incremented at every occurrence
>    of 'open-quote' or 'no-open-quote', and decremented at every
>    occurrence of 'close-quote' or 'no-close-quote' other than those
>    that would make it negative.  The quotation mark rendered for an
>    open-quote is the first quotation mark in the pair of quotes at
>    the nesting level after that open-quote, unless that nesting level
>    is greater than the number of pairs, in which case the first
>    quotation mark in the last pair is repeated.  Likewise, for
>    close-quote, the quotation mark rendered is the second quotation
>    mark in the pair of quotes at the nesting level before that
>    close-quote, unless that nesting level is greater than the number
>    of pairs, in which case the second quotation mark in the last pair
>    is repeated, or unless that depth is 0, in which case no quotation
>    mark is rendered.

Simon, David: this bug is tracked at 
https://www.w3.org/Bugs/Public/show_bug.cgi?id=15449

Cheers,
Anton Prowse
http://dev.moonhenge.net
Received on Sunday, 8 January 2012 11:57:16 GMT

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