From: fantasai (fantasai.lists@inkedblade.net)
Date: Wed May 18 2011 - 18:27:07 CDT
On 05/18/2011 01:52 AM, Andrew West wrote:
> On 18 May 2011 02:14, fantasai<fantasai.lists@inkedblade.net> wrote:
>> On 05/17/2011 03:58 PM, Andrew West wrote:
>>>
>>> The one thing that seems to be oddly missing from the table is
>>> information on the page progression for each script. Surely there
>>> should be a column noting that, for example, Han script has
>>> right-to-left page progression whereas Mongolian and Phags-pa have
>>> left-to-right page progression. Without this additional information,
>>> anyone trying to make use of this appendix would still not know how to
>>> correctly layout text for each script.
>>
>> If you're looking for information that's missing from the appendix,
>> you should probably look outside the appendix... :)
>> http://dev.w3.org/csswg/css3-writing-modes/#page-direction
>
> Whilst it is true that elsewhere in the document (not the section you
> pointed to above) it is noted in passing that "For Chinese and
> Japanese lines are ordered either right to left or top to bottom,
> while for Mongolian and Manchu lines are ordered left to right", I
> cannot find anywhere that explicitly specifies the page progression of
> each script in the same way that you attempt to specify the
> "bi-orientational transformation" of each script. ...
In CSS, the page progression is derived from the writing mode, which,
like the primary directionality of the document, must be specified by
the page author. It is not derived from the the first character of the
document or anything like that.
The bi-orientational transformation must be specified, and is normative
because it is required for the implementation to correctly set vertical
text. See http://dev.w3.org/csswg/css3-writing-modes/#intro-text-layout
~fantasai
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