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Re: [css-writing-modes-3] range limit for 'text-combine-upright: all' versus 'text-combine-upright: digits <integer>'

From: Koji Ishii <kojiishi@gluesoft.co.jp>
Date: Mon, 22 Jun 2015 09:35:12 +0000
To: Gérard Talbot <www-style@gtalbot.org>
CC: Elika Etemad <fantasai.lists@inkedblade.net>, W3C www-style mailing list <www-style@w3.org>, Masataka Yakura <masataka.yakura@gmail.com>
Message-ID: <B2ACE9EA-5652-4ECF-815A-44D4942068B6@gluesoft.co.jp>

> On Jun 22, 2015, at 9:41 AM, Gérard Talbot <www-style@gtalbot.org> wrote:
> 
> Koji, Elika,
> 
> "
> all
>    Attempt to typeset horizontally all consecutive characters within the box such that they take up the space of a single character within the vertical line box.
> 
> digits <integer>?
> 
>    Attempt to typeset horizontally each maximal sequence of consecutive ASCII digits (U+0030–U+0039) that has as many or fewer characters than the specified integer such that it takes up the space of a single character within the vertical line box. If the integer is omitted, it computes to 2. Integers outside the range 2-4 are invalid.
> "
> 9.1 Horizontal-in-Vertical Composition: the text-combine-upright property
> http://www.w3.org/TR/css-writing-modes-3/#text-combine-upright

> 
> There seems to be no implicit (and no explicit) range limit to the number of consecutive characters when using 'text-combine-upright: all' but there is a range 2-4 limit with 'text-combine-upright: digits n':
> Q1: is that assumption correct? (To me, this seems odd and incoherent.)

Correct.

> Q2: If there is no range limitation with 'text-combine-upright: all', then
> why should there be one with 'text-combine-upright: digits n' where 'n'
> would be a [2-9] digit?

“all” is not likely to be affected much by the number of characters; it just measure the whole string, and shrink if needed.

“digits” checks the number of characters, and thus could fail on specific number. A request was made to avoid implementations and testing that were never used in the real world.

> Q3: Is this test valid:
> 
> http://test.csswg.org/source/css-writing-modes-3/value-all-003.html


Looks good to me. I see anti-alias causing thin white line between each compressed character, so images do not match unfortunately. Changing font-size to the multiple of 5px does not seem to help here, probably because of compression. I don’t know how to solve that.

/koji

Received on Monday, 22 June 2015 09:35:45 UTC

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