Are you proposing new mutation record type? I think that could handle
most of the enter/leave requirements.
observer.observe(target, { element: 'x-foo' });
If MutationObservers are an open topic for extension, I'd love to see
generic css selector support.
observer.observe(target, { selector: 'foo' });
observer.observe(target, { selector: '.foo' });
That'd cover element name "enter" and "leaves" as well.
On Tue, Feb 11, 2014 at 7:41 PM, Ryosuke Niwa <rn...@apple.com> wrote:
> Hi,
>
> I’m bringing this up out of:
>
> [Custom]: enteredView and leftView callbacks are still confusing
> https://www.w3.org/Bugs/Public/show_bug.cgi?id=24314
>
> Could someone clarify exactly why mutation observers can’t satisfy use cases
> for custom elements?
>
> I strongly believe that we should extend mutation observers (e.g. add some
> flag to fire more eagerly) so that we could *explain* these callbacks in
> terms of mutation observers.
>
> - R. Niwa
>
>
