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Re: [css21] The 'inherit' keyword in shorthand properties

From: Anton Prowse <prowse@moonhenge.net>
Date: Mon, 02 Jan 2012 15:15:33 +0100
Message-ID: <4F01BC05.60203@moonhenge.net>
To: www-style@w3.org
CC: fantasai <fantasai.lists@inkedblade.net>, Øyvind Stenhaug <oyvinds@opera.com>
On 02/01/2012 14:59, Anton Prowse wrote:
> On 14/10/2011 23:31, fantasai wrote:
>> On 10/13/2011 08:13 AM, Øyvind Stenhaug wrote:
>>> http://www.w3.org/2011/10/12-css-irc#T16-47-22
>>>
>>> "RESOLVED: accept TabAtkins and fantasai's proposal such that inherit
>>> turns the specified value into the parent's computed value"
>>>
>>> I just realized that this doesn't necessarily make any sense for
>>> shorthand properties. In fact, most of chapter 6 seems to
>>> operate under an unstated assumption that each declaration setting a
>>> shorthand has been converted to equivalent declarations
>>> for the corresponding longhand properties.
>>>
>>> There is a sentence about how declaring a shorthand to be !important
>>> is equivalent to declaring all of its sub-properties to
>>> be !important. Probably there should be similar wording for 'inherit'.
>>
>> I suggest instead stating that unstated assumption so that this all works
>> and we don't have to work out every missing detail.
>
> Surely this is just a special case of setting /any/ value on a shorthand
> property? If it's not clear from 1.4.3 (Shorthand properties)[1] that
> the mechanism works like that then I think we should solve that more
> general issue instead. ("!important" is different because it's not a
> value.)
>
> The problem that Øyvind raises with regards to the change proposal[2,3]
> is part of the wider problem that value assignment on shorthand
> properties is not well-defined.[4] The proposal above doesn't solve that
> problem even in the case that Øyvind describes.
>
> [1] http://www.w3.org/TR/CSS21/about.html#shorthand
> [2] http://lists.w3.org/Archives/Public/www-style/2011Oct/0482.html
> [3] http://www.w3.org/Style/css2-updates/REC-CSS2-20110607-errata.html
> [4] https://www.w3.org/Bugs/Public/show_bug.cgi?id=15384

Sorry, please ignore me; my claim is incorrect, and I do think the 
behaviour of 'inherit' on shorthands needs clearer treatment.

Cheers,
Anton Prowse
http://dev.moonhenge.net
Received on Monday, 2 January 2012 14:16:03 GMT

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