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Re: [css3-text-layout] margin-before/after/start/end etc. and :ttb pseudo-classes

From: MURATA Makoto (FAMILY Given) <eb2m-mrt@asahi-net.or.jp>
Date: Mon, 07 Jun 2010 09:28:08 +0900
To: www-style@w3.org
Message-Id: <20100607092808.95E3.B794FC04@asahi-net.or.jp>
>  > >   :lrt   horizontal writing is supported and @dir has been set to 'lrt'
>  > >   :rtl   horizontal writing is supported and @dir has been set to 'rtl'
>  > >   :ttb   vertial writing is supported and the initial value of
>  > >          'writing-mode' is 'tb-rl'
>  > 
>  > is different from what I wrote as "pseudo-selectors based on values specified in 
>  > documents or stylesheets ".
> Right.
> Does this mean you could live with the definition, as quoted above?


First, having recognized fantasai's proposal, I think that it should be carefully studied.
(We might want to have *both*).

Second, I have a number of comments on the proposal.  See

Third, I am worried about the way BIDI and vertical writing are handled together.
I guess that there are some fundamental differences between BIDI requirements and 
horizontal writing.   Note that (1) Unicode has BIDI but not vertical writing, and that (2) 
HTML has @dir="ltr" and @dir="rtl" for years, but not @dir="ttb". 

I am afraid that I do not have deep understanding of BIDI requirements including the 
interactions among BIDI, users' preferences on directions, and relative margins, etc, and 
I do not know how these features are implemented by major browsers.  Are we ready to 
provide a unified solution that aims to address both BIDI-related issues and vertical-writing-
related issues? 

Received on Monday, 7 June 2010 00:28:39 UTC

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