[Bug 21969] [Custom]: add attributeChangedCallback to the set of prototype callbacks

https://www.w3.org/Bugs/Public/show_bug.cgi?id=21969

--- Comment #3 from Scott Miles <sjmiles@chromium.org> ---
Ok, must think more and write less.

Unless I am messing up again, the issue is that people have insisted that
attributeChangedCallback must in fact be *synchronous*, so that custom elements
can behave like regular elements that can react synchronously to attribute
changes.

For this reason, MutationObserver doesn't help and we require platform support.

Sorry for the noise.

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Received on Wednesday, 8 May 2013 17:19:37 UTC