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Re: [1.2T-LC] text-align incompatible with CSS (ISSUE-2057 ACTION-2200)

From: Doug Schepers <schepers@w3.org>
Date: Thu, 18 Sep 2008 14:17:18 -0400
Message-ID: <48D29B2E.3000507@w3.org>
To: fantasai <fantasai.lists@inkedblade.net>
CC: www-svg <www-svg@w3.org>

Hi, fantasai-

The SVG WG agrees with this, and made the following changes, which we
hope will satisfy you comment.

> fantasai wrote (on 9/17/08 1:41 PM):
>> http://www.w3.org/TR/SVGMobile12/text.html#TextAlignProperty
>> There are two problems with this definition. First
>>   # Note that SVG does not require user-agents to support the
>>   # following values for this property: "justify", "inside",
>>   # "outside", <string>, "left", or "right". When an unsupported
>>   # value is encountered it must be treated as the property
>>   # had not been specified.
>> It should be normatively allowed for the UA to support the
>> other values of text-align. If the UA also supports CSS then
>> it's not possible for the values not listed here to be ignored.

We clarified this to say:
When a value not supported by the user agent is encountered, it must be
treated as the property had not been specified.

This way, UAs that do support CSS may use those values, while others may
claim conformance to SVG 1.2 Tiny (which doesn't mandate CSS support).

>> Second problem is here:
>>   # The values "start" and "end" are dependent on the writing
>>   # system being used.
>>   #
>>   #   * For left to right horizontal (English, French, etc):
>>   #     start=left and end=right
>>   #   * For right to left horizontal (Hebrew, Arabic, etc):
>>   #     start=right and end=left
>>   #   * For top to bottom vertical (vertical Chinese, etc):
>>   #     start=up and end=down
>> "writing system being used" is not a good basis for alignment.
>> What about mixed script text? text-align should be dependent
>> on SVG's equivalent of the containing block's 'direction'
>> property. (Which afaict doesn't exist in SVG Tiny, but more on
>> that problem later.)
>> Also given "In SVG Tiny 1.2, vertical writing is not supported."
>> in http://www.w3.org/TR/SVGMobile12/text.html#TextLayout that
>> last sentence should be removed.

Because we do not forbid SVG 1.2 Tiny UAs to support vertical text, and
because we want to keep consistency with our other specs, we decided not
to remove the last bullet point.

But we do agree that it could be confusing for readers (though it's
mentioned in the prefatory material), so we added an explanatory note to
the bullet point:
* For top to bottom vertical (vertical Chinese, etc): start=up and
end=down (Note: SVG Tiny 1.2 does not mandate the support of vertical text.)

You can see the changes inline here:

Please let us know if this satisfies your comment.  If we do not hear
from you within two weeks of today, we will assume that you have
accepted our resolutions.

-Doug, on behalf of the SVG WG
Received on Thursday, 18 September 2008 18:17:54 UTC

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