[webkit-dev] Replacing DOM Mutation Events

Dominic Cooney dominicc at chromium.org
Wed Aug 17 17:39:51 PDT 2011

This looks awesome.

Do you have a link to Jonas‘ latest proposal? Because the original one
you linked to <http://lists.w3.org/Archives/Public/public-webapps/2011AprJun/1318.html>
seems to be different to your patch (eg in API names, etc.) The
asymmetry between addMutationListener, which can incrementally
register for specific types, and removeMutationListener, which is a
blunt instrument, is curious… I would like to read the specific

It would be nice if there was an open source test suite that is easily
accessible to UA implementors to ensure implementations are


On Wed, Aug 17, 2011 at 11:07 AM, Adam Klein <adamk at chromium.org> wrote:
> Greetings webkit-dev,
> It's generally agreed upon in the web community, and in WebKit
> specifically, that DOM Mutation Events are a bad thing. See, e.g.,
> discussion on https://bugs.webkit.org/show_bug.cgi?id=8191 (relating
> to DOMAttrModified, and why WebKit does not wish to implement it) and
> https://lists.webkit.org/pipermail/webkit-dev/2010-August/013805.html
> (a discussion of replacing DOM mutations with something better, or
> removing them entirely).
> In late June, Jonas Sicking and Olli Pettay from Mozilla put forward
> proposals on public-webapps
> (http://lists.w3.org/Archives/Public/public-webapps/2011AprJun/1318.html)
> to replace mutation events with a different API, one that avoids the
> problems associated with the existing spec.
> Rafael Weinstein has helpfully summarized the public-webapps thread
> (which is now upwards of 200 messages long) in
> http://lists.w3.org/Archives/Public/public-webapps/2011JulSep/0779.html,
> and discussion is ongoing in
> http://lists.w3.org/Archives/Public/public-webapps/2011JulSep/0780.html.
> Any WebKit folks interested in the future of mutation events in the
> DOM are invited to join that discussion, and their input would be much
> appreciated.
> I've also put together a partial implementation of Jonas' most recent
> proposal and uploaded my
> work-in-progress patch to
> https://bugs.webkit.org/show_bug.cgi?id=66079. Note that this is very
> early work, and if I were submitting it for review it would be in much
> smaller chunks, but I welcome any comments or questions on the code
> as-is.
> - Adam
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