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Re: [css3-background] clarify which properties in this module apply to ::first-letter and ::first-line

From: Brad Kemper <brad.kemper@gmail.com>
Date: Tue, 3 Apr 2012 05:49:27 -0700
Message-Id: <501491C1-25E3-4B97-B781-7540A020B25B@gmail.com>
Cc: "www-style@w3.org" <www-style@w3.org>
To: fantasai <fantasai.lists@inkedblade.net>

On Apr 2, 2012, at 3:52 PM, fantasai <fantasai.lists@inkedblade.net> wrote:

> On 03/28/2012 12:09 PM, fantasai wrote:
>> 
>> Now, there are two approaches to categorizing the properties in css3-background
>> into "applies" and "doesn't apply" buckets for ::first-line
>> 
>> A) Things considered "background" properties apply, those considered "border"
>> properties don't apply. So determine which bucket each property falls into.
>> This is somewhat ambiguous for things like border-radius and box-shadow.
>> 
>> B) Go back to the principles of *why* border was excluded from ::first-line
>> and why background was not, and derive the categorizations from that.
>> 
>> You're trying to do A. Brad is trying to do B. This is why you're disagreeing here.
>> ...
>> Anyway, this thread leaves us with three proposals:
>> 
>> 1) Interpret all 'border-*' properties as "border properties" per 2.1, and
>> exclude them all.
>> 2) Interpret all properties reset by the 'border' shorthand as "border
>> properties" per 2.1, and exclude them all. Include 'border-radius'.
>> 3) Exclude only layout-affecting properties, i.e. only the CSS2.1 "border
>> properties". Include 'border-radius' and 'border-image'.
> 
> Okay, so here's proposed wording for various solutions:
> 
> Proposal 1:
>  All properties in this module apply to the ::first-letter pseudo-element.
>  The _background properties_ also apply to the ::first-line pseudo-element.
>  The UA may, but is not required to, apply the border-radius, border-image,
>  or box-shadow properties to ::first-line. The UA must not apply the
>  _border properties_ to ::first-line.
> 
>  ::first-line summary:
>      MUST:
>        all background properties
>      MAY:
>        any other properties that don't affect layout
>      MUST NOT:
>        properties that affect layout
> 
>  Variant: shift 'box-shadow' into MUST NOT category
> 
> Proposal 2:
>  All properties in this module apply to the ::first-letter pseudo-element.
>  The _background_  and _border-radius_ properties also apply to the
>  ::first-line pseudo-element. The UA may, but is not required to, apply
>  border-image or box-shadow properties to ::first-line.
>  The UA must not apply the _border properties_ to ::first-line. [CSS21]
> 
> 
>  ::first-line summary:
>      MUST:
>        all background properties and border-radius
>      MAY:
>        any other properties that don't affect layout
>      MUST NOT:
>        properties that affect layout
> 
>  Variant: shift 'box-shadow' into MUST NOT category
> 
> Proposal 3:
>  All properties in this module apply to the ::first-letter pseudo-element.
>  The _background_, _border-radius_, and _border-image_ properties also apply
>  to the ::first-line pseudo-element. The UA may, but is not required to, apply
>  box-shadow to ::first-line. The UA must not apply the _border properties_ to
>  ::first-line. [CSS21]
> 
>  Variant: shift 'box-shadow' into MUST NOT category
> 
> I'm leaning towards 1 or 2. Don't have a preference between them, but do have
> a preference for allowing box-shadow rather than disallowing it: I don't see
> a benefit to making an implementation that supports it non-conforming.

I prefer #2, then #1.
Received on Tuesday, 3 April 2012 12:49:58 GMT

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