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Re: [css-text] Shaping Isolation and Layout Separation of Inlines

From: fantasai <fantasai.lists@inkedblade.net>
Date: Mon, 18 Aug 2014 20:16:58 -0700
Message-ID: <53F2C1AA.7000504@inkedblade.net>
To: John Daggett <jdaggett@mozilla.com>
CC: WWW International <www-international@w3.org>, www-style@w3.org
On 08/18/2014 06:45 PM, John Daggett wrote:
> fantasai wrote:
>> I think there are three classes of guidelines here, actually:
>>     1. Must not break shaping. (No style change case. You have no excuse.)
>>     2. Should not break shaping, if possible. YMMV depending on
>>        implementation/font technology. Less breakage = better.
>>     3. Must break shaping.
>> And I think we should be able to give interoperable results
>> on 1 and 3.
> Yeah, I think this makes sense.

Cool. So, just to go back to the original proposal:

Cases proposed to fall under #3 are those listed:
   A. one of margin/border/padding are non-zero
   B. vertical-align is not 'baseline'
   C. it is a bidi isolation boundary

Everything else is #1 or #2 (which needs some further wordsmithing).


> There may cases here where shaping shouldn't break but the final
> presentation may be tricky. For example, color changes within a
> pair of characters that form a ligature. For this situation I
> don't think you can say anything other than implementations make
> a "best effort" to display something sensible. Gecko solves the
> color change by coloring 1/nth of the resulting ligature formed
> from n characters. Sorta works sometimes but calling this a hack
> is certainly fair. :)

Agreed. :)

Received on Tuesday, 19 August 2014 03:17:30 UTC

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