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Re: Writing mode

From: Glenn A. Adams <gadams@xfsi.com>
Date: Fri, 17 Apr 2009 19:21:40 +0800
To: Sean Hayes <Sean.Hayes@microsoft.com>, Public TTWG List <public-tt@w3.org>
Message-ID: <C60E8744.A3DD%gadams@xfsi.com>

lr is shorthand for lrtb
rl is shorthand for rltb

lrtb rltb tbrl and tblr enumerate the four supported combinations of block
progression direction (bpd) and inline progression direction (ipd) as

       bpd    ipd
lrtb   t2b    l2r
rltb   t2b    r2l
tblr   l2r    t2b
tbrl   r2l    t2b

where t2b is top to bottom, l2r is left to right, r2l is right to left; note
that we donıt support any bottom to top modes, or a few other esoteric modes
supported by XSL; see
http://www.w3.org/TR/2006/REC-xsl11-20061205/#writing-mode for more info;

On 4/17/09 6:36 PM, "Sean Hayes" <Sean.Hayes@microsoft.com> wrote:

> We currently allow values of lrtb | rltb | tbrl | tblr | lr | rl | tb |
> inherit for the writingMode property.
> But unless Iım missing something, there is no way in the reduced formatting
> model of timed text to distinguish between lrtb and rltb modes; since in both
> modes mode, I canıt see any way to get two blocks to be placed side by side.
> Is there any distinction we can make between these modes in the test suite? If
> not, should we perhaps just restrict the value set to:   tbrl | tblr | lr | tb
> | inherit ?
> Sean Hayes
> Media Accessibility Strategist
> Accessibility Business Unit
> Microsoft
Received on Friday, 17 April 2009 11:22:27 UTC

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