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Re: [css3-writing-modes] horizontal-bt writing mode

From: David Hyatt <hyatt@apple.com>
Date: Tue, 26 Oct 2010 13:16:43 -0500
Cc: John Daggett <jdaggett@mozilla.com>, www-style list <www-style@w3.org>
Message-id: <EA518FD2-D53C-4725-A18E-336084926024@apple.com>
To: fantasai <fantasai.lists@inkedblade.net>
On Oct 25, 2010, at 5:17 PM, fantasai wrote:

> On 10/25/2010 01:32 AM, John Daggett wrote:
>> fantasai wrote:
>> 
>>>> Looking over the current CSS3 Writing Modes spec, I'm puzzling over
>>>> what writing-mode 'horizontal-bt' is needed for?  It's defined as:
>>>> 
>>>>    "Bottom-to-top block flow. The writing mode is horizontal."
>>>> 
>>>> What's the script that requires this?  Or is it just there for
>>>> completeness?
>>>> 
>>>>    http://dev.w3.org/csswg/css3-writing-modes/#writing-mode
>>> 
>>> It's just there for completeness. MS requested that such a mode exist
>>> since they implement it (for completeness, and because given all the
>>> other modes, they thought it was easy).
>> 
>> If block-progression and direction are defined as in the IE Blog post,
>> then I could see that it would fall out from having two independent
>> properties.  But with a single property, I don't think it's needed for
>> completeness so I would suggest dropping it.  It may be easy to
>> implement but features that serve no purpose add time to testing
>> and conformance requirements.
> 
> I don't particularly care either way, but at this early stage in the
> draft, I think it's better to leave it in. When we're closer to CR,
> we can discuss what to keep and what to drop and what to mark at-risk.
> I'm happy to mark it as an issue, though.
> 
> I will say, Behdad's cell phone use case is interesting.

There is really no reason to leave it out.  Once you've abstracted your engine, horizontal-bt just comes along for free.

dave
(hyatt@apple.com)
Received on Tuesday, 26 October 2010 18:17:18 GMT

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