From: fantasai (fantasai.lists@inkedblade.net)
Date: Tue May 17 2011 - 15:04:01 CDT
On 05/17/2011 12:01 PM, Asmus Freytag wrote:
>
> The important aspect that was missing in the original request is what effect the status of a script is expected to have in the
> context of CSS. One thing that Unicode has discovered over the years is that it's nearly impossible to define any character
> properties that are truly independent of the algorithm(s) that plan to use them. To make the property useful, certain
> assumptions must be made about how they are used, in some cases, by publishing a single algorithm.
>
> Ken's question highlights one possible use of this information. A more detailed presentation of the requirements and how CSS
> would apply any such classification would help in getting more useful answers.
I'm looking for this information in order to complete this appendix:
http://dev.w3.org/csswg/css3-writing-modes/#script-orientations
How this information is used is described at a high level here:
http://dev.w3.org/csswg/css3-writing-modes/#intro-text-layout
and in detail in the subsequent sections. The relevant normative bits
are:
# In vertical typographic modes, any grapheme clusters belonging to a
# vertical script must be set using its base character's intrinsic
# orientation. (See Appendix B.) Grapheme clusters belonging to
# horizontal-only scripts must set sideways (for ‘vertical-right’)
# or set upright (for ‘upright’) depending on the ‘text-orientation’
# property.
#
# The orientation of characters belonging to the Common, Inherited,
# and Unknown script categories may be UA- or font-dependent in
# vertical typographic modes: [details]
~fantasai
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