[webkit-dev] Unprefixing DOM MutationObservers, and looking for help from port maintainers

[Ryosuke Niwa]

Before unprefixing it, can we make sure we also pass Mozilla's tests and
vice versa? Mutation events was a huge mess partially because browsers
didn't interoperate. I'd like to make sure this API interoperates well from
day 1.

- Ryosuke

On Fri, Jun 15, 2012 at 10:31 AM, Adam Klein <adamk at chromium.org> wrote:

> An update: it appears that the GTK and EFL ports have added at least
> basic support for end-of-task delivery, in
> http://trac.webkit.org/changeset/108628 and
> http://trac.webkit.org/changeset/110568. They now pass all
> MutationObserver tests. Do these tests pass in the actual browsers
> built from GTK and EFL, or only DRT?
>
> On Fri, Jun 8, 2012 at 2:16 PM, Adam Klein <adamk at chromium.org> wrote:
> > Hi webkit-dev,
> >
> > DOM MutationObservers (see meta bug
> > https://bugs.webkit.org/show_bug.cgi?id=68729) have been shipping as
> > WebKitMutationObserver in Chromium since earlier this year. The
> > feature is fully specced as part of DOM4
> > (http://www.w3.org/TR/domcore/#mutation-observers) and is implemented
> > in Firefox. Mozilla has also recently unprefixed their version of the
> > API (https://bugzilla.mozilla.org/show_bug.cgi?id=749920), and I'd
> > like to do the same (https://bugs.webkit.org/show_bug.cgi?id=85161).
> >
> > The tricky part is that while the Chromium version is complete and
> > compatible with Firefox, there's one piece missing from all other
> > ports (https://bugs.webkit.org/show_bug.cgi?id=78290). The short
> > version is that each port needs to be able to run some code
> > (delivering mutations) at the end of every task (see
> >
> http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#processing-model-2
> ,
> > step 4 "Perform a microtask checkpoint"). Without this code, mutations
> > due to user input are not delivered in a timely fashion.
> >
> > It's easy for Chromium to do this because we have our own MessageLoop
> > abstraction wrapping the native event loops on various platforms, so
> > our definition of end-of-task is easy to define. But implementing this
> > properly is likely to be slightly different for every port.
> >
> > In the short term, my plan is to add the unprefixed version (in
> > addition to the prefixed) of MutationObserver when PLATFORM(CHROMIUM)
> > is enabled. But I'd like to help other ports implement this
> > appropriately, and provide the unprefixed version there too. Please
> > let me know how I can be of assistance.
> >
> > Let me know if you have questions or concerns,
> > Adam Klein
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