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Re: [css3-writing-modes] Request to publish Last Call Working Draft

From: Alan Gresley <alan@css-class.com>
Date: Fri, 27 May 2011 12:38:21 +1000
Message-ID: <4DDF0E9D.4070500@css-class.com>
To: "Aharon (Vladimir) Lanin" <aharon@google.com>
CC: fantasai <fantasai.lists@inkedblade.net>, "www-style@w3.org" <www-style@w3.org>, w3c-css-wg <w3c-css-wg@w3.org>
On 26/05/2011 3:19 PM, Aharon (Vladimir) Lanin wrote:
> Are the *-start and *-end properties, as implemented in Firefox and WebKit,
> relative to the element's direction or the element's parent's direction?


The parent's or ancestor's direction that establishes a new level of 
bidi embedding. These test all set the *-start and *-end values on the 
parent or grandparent.


> Please note that the same arguments that fantasai brought up for the
> "CSS2.1/CSS3WM [issue] on nested bidi and breaking inlines across lines" (
> http://lists.w3.org/Archives/Public/www-style/2011May/0186.html) applies to
> these properties, in favor of using the element's parent's direction.


Correct. I didn't mention that since Fantasai stated that feedback was 
to exclude that issue. What Fantasai noted about 'breaking inlines 
across lines' is absolutely correct but I do expect that if all 
implementations handled this the same as IE8, IE9 and IE10 does where 
margins and borders are visual and not logical and are based on the 
parent's or ancestor's direction, then there would be no problem with 
using start and end values for logical values.

http://css-class.com/test/css/bidi/direction-bidi-ordering-inline.htm


> Also, do Firefox and Webkit handle the conflict between these values and
> *-left and *-right in the same manner?


For the test with direction of parent or ancestor, both Firefox and 
WebKit handles start and end values correctly (excluding Safari that has 
some bug that Chrome doesn't). I don't understand what you mean by a 
conflict since I see no conflict. Left and right values are visual and 
start and end values are logical.


> I.e., do they both keep them as
> separate properties until they have to be actually used for some element,
> and then have the same policy re whether it is the logical or the physical
> property that wins?
>
> Aharon


Cascadence is the things that allow something to win. Something like 
this but using text-align.

http://css-class.com/test/css/bidi/start-and-end-values-text-align2.htm


With this CSS.


[dir="rtl"] .align-start {
	text-align: right;
	text-align: start;
}

[dir="rtl"] .align-end {
	text-align: left;
	text-align: end;
}

[dir="ltr"] .align-start {
	text-align: left;
	text-align: start;
}

[dir="ltr"] .align-end {
   text-align: right;
   text-align: end;
}



-- 
Alan Gresley
http://css-3d.org/
http://css-class.com/
Received on Friday, 27 May 2011 02:38:54 GMT

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