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Re: [CSS21] [css3-writing-modes] We got the bidi box model backwards

From: Aharon (Vladimir) Lanin <aharon@google.com>
Date: Wed, 11 May 2011 13:32:51 +0300
Message-ID: <BANLkTinEoCu+28=Y8LZoQ=a_=5CwWStPvg@mail.gmail.com>
To: CE Whitehead <cewcathar@hotmail.com>
Cc: fantasai <fantasai.lists@inkedblade.net>, W3C style mailing list <www-style@w3.org>, "public-i18n-bidi@w3.org" <public-i18n-bidi@w3.org>, Simon Montagu <smontagu@smontagu.org>
What you suggest does sound more useful, but I do not consider myself an
authority on this. Isn't there a backwards compatibility problem with
changing the spec, though?

Aharon

On Wed, May 11, 2011 at 6:22 AM, CE Whitehead <cewcathar@hotmail.com> wrote:

>
>
> Hi, I agree with Fantasai for this case.
>
> > Date: Tue, 10 May 2011 14:55:55 -0700
> > From: fantasai.lists@inkedblade.net
> > To: www-style@w3.org; public-i18n-bidi@w3.org; smontagu@smontagu.org;
> aharon@google.com
> > Subject: [CSS21] [css3-writing-modes] We got the bidi box model backwards
>
> >
> > http://www.w3.org/TR/CSS21/box.html#bidi-box-model
> >
> > # When the element's 'direction' property is 'ltr', the left-most
> generated box of
> > # the first line box in which the element appears has the left margin,
> left border
> > # and left padding, and the right-most generated box of the last line box
> in which
> > # the element appears has the right padding, right border and right
> margin.
> > #
> > # When the element's 'direction' property is 'rtl', the right-most
> generated box
> > # of the first line box in which the element appears has the right
> padding, right
> > # border and right margin, and the left-most generated box of the last
> line box in
> > # which the element appears has the left margin, left border and left
> padding.
> >
> > The issue is when inlines are broken across lines. Right now we decide
> which side
> > of the first/last box to draw the start/end decorations on based on the
> element's
> > 'direction' property. But I believe it should be the element's /parent's/
> direction
> > property.
> >
> > Here's why:
> >
> > Consider that you are embedding some text, e.g. a quote, into a
> paragraph. You
> > want to space it off a bit from the surrounding content, like this:
> >
> > q {
> > margin: 0 0.5em;
> > }
> >
> > |Here is some text AND HERE IS MY QUOTE|
> > |THAT CONTINUES ON THE LINE and my text|
> > |continues. |
> >
> > If the quote happens to be of opposite-direction text, the separation
> doesn't
> > work anymore, because we placed the box decorations based on the quote's
> > directionality and not the paragraph's directionality.
> >
> > |Here is some text ETOUQ YM SI EREH DNA |
> > | ENIL EHT NO SEUNITNOC TAHT and my text|
> > |continues. |
> >
> > Now, we definitely want the left border on the left side and the right
> border
> > on the right side, but I'm starting to think we should have chosen
> differently
> > which side is the "broken" side when the element breaks across lines.
> >
> > Here's the example again using brackets to represent borders.
> >
> > |Here is some text [AND HERE IS MY QUOTE|
> > |THAT CONTINUES ON THE LINE] and my text|
> > |continues. |
> >
> > |Here is some text ETOUQ YM SI EREH DNA] |
> > | [ENIL EHT NO SEUNITNOC TAHT and my text|
> > |continues. |
>
> I agree the element should be broken according to the parent's element's
> directionality.
> Thanks for thinking of this!
>
> Best,
>
> --C. E. Whitehead
> cewcathar@hotmail.com
> >
> > Aharon, smontagu -- thoughts?
> >
> > Is this something we should fix?
> >
> > ~fantasai
> >
>
>
Received on Wednesday, 11 May 2011 10:33:36 GMT

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