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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: Thu, 01 Sep 2011 21:11:37 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1QzEXx-0003sG-Ue@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=13999

--- Comment #3 from Marat Tanalin (tanalin.com) <mtanalin@yandex.ru> 2011-09-01 21:11:37 UTC ---
(In reply to comment #1)

> The performance of classList is an implementation detail.  There's no
> particular reason for it to be slower.

One of major reasons is that consequent adding classes one by one causes
multiple rendering-reflows. (Each reflow is quite time-expensive operation.)

Opposite to this, adding multiple classes at once causes only one reflow.

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