This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
No, why?
No. This was discussed at length already.
So is this compatible with the implementations? Webkit has https://trac.webkit.org/browser/trunk/Source/WebCore/dom/MutationCallback.idl#L34 In Gecko we do support http://mxr.mozilla.org/mozilla-central/source/dom/interfaces/core/nsIDOMMutationObserver.idl#68 so { handleMutation() {} } would be supported. But I'm about to move the implementation to new bindings so I take webidl from the spec, where there isn't a callback interface anymore.
Though, I guess implementations aren't compatible either.