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Re: [css-writing-modes] 'direction' vs. vertical text

From: Simon Sapin <simon.sapin@exyr.org>
Date: Wed, 07 May 2014 17:31:38 +0100
Message-ID: <536A5FEA.2060005@exyr.org>
To: "Tab Atkins Jr." <jackalmage@gmail.com>
CC: www-style list <www-style@w3.org>
On 07/05/2014 17:27, Tab Atkins Jr. wrote:
> On Wed, May 7, 2014 at 7:59 AM, Simon Sapin <simon.sapin@exyr.org> wrote:
>> In "Introduction to Writing Modes", the inline base direction is defined
>> such that it exists in all writing modes. However, the current definition of
>> the 'direction' property seems to assume an horizontal writing mode:
>>
>>> Values for this property have the following meanings:
>>>
>>> ltr
>>>      Left-to-right directionality.
>>> rtl
>>>      Right-to-left directionality.
>>
>>
>> What do these values mean for vertical text?
>>
>> Should they map to top-down and bottom-up respectively, or should the
>> inline-start direction always be up, or something else?
>>
>> (This may be defined in another part of the spec that I haven’t read yet,
>> but it should at least be linked from here, if not defined here.)
>
> It could perhaps be clarified that it refers to line-left to
> line-right directionality, etc.  (Those are the line-relative
> directions.)

I was gonna reply "sounds fine, with the terms appropriately 
linked/cross-referenced", but the definition of these terms seems to be 
based on 'direction' so I still don’t know what they mean in a vertical 
writing mode :)

> line-left
>     Nominally the side from which LTR text would start.
> line-right
>     Nominally the side from which RTL text would start. (Opposite of line-left.)

-- 
Simon Sapin
Received on Wednesday, 7 May 2014 16:32:02 UTC

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