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[Bug 13999] DOMTokenList (e.g., element.classList): allow to add/remove multiple tokens at once

From: <bugzilla@jessica.w3.org>
Date: Fri, 02 Sep 2011 06:54:56 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1QzNeS-00024H-Ss@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=13999

--- Comment #5 from Simon Pieters <simonp@opera.com> 2011-09-02 06:54:55 UTC ---
(In reply to comment #3)
> One of major reasons is that consequent adding classes one by one causes
> multiple rendering-reflows. (Each reflow is quite time-expensive operation.)

I don't think this is true. Reflows are generally batched up and happen only
once when the script is finished doing what it's doing (except in Opera if the
script is taking a long time), unless you force a reflow by asking for layout
with .offsetLeft or so between adding your classes.

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