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Re: [css3-writing-modes] implementation costs for logical properties

From: Håkon Wium Lie <howcome@opera.com>
Date: Tue, 26 Oct 2010 10:21:21 +0200
Message-ID: <19654.36737.668666.129974@gargle.gargle.HOWL>
To: fantasai <fantasai.lists@inkedblade.net>
Cc: koba Mobile2 <koba@antenna.co.jp>, John Daggett <jdaggett@mozilla.com>, www-style@w3.org, howcome@opera.com
Also sprach fantasai:

 > That said, the performance and memory considerations for logical
 > properties are not as bad as they seem at first glance. Since
 > you can compute the logical-physical equivalence at cascade time,
 > you only need to store one set of data per element (physical or
 > logical, depending on your layout architecture). So the extra
 > memory load is almost nothing.

In the formatting process, you need to remember ~35 new properties for
every element, right? You can only let go of these when you know the
computed value of 'writing-mode' for that element. And what about the
DOM, are you saying that the DOM will not offer any information about
logical properties after formatting has been done? So, if
'writing-mode' changes through the DOM, logical properties don't

              Håkon Wium Lie                          CTO °þe®ª
howcome@opera.com                  http://people.opera.com/howcome
Received on Tuesday, 26 October 2010 08:22:15 UTC

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