Re: [whatwg/dom] Make it possible to observe connected-ness of a node (#533)

@rniwa alright. To avoid stalling, how about we investigate whether synchronous reactions are feasible first?

@caridy, you say that you would like get feedback from implementors in regards to the perf implications of sync reactions. I think that is a great idea since it helps us understand if a sync solution is feasible. If implementors will simply block this proposal out of performance concerns and lessons learned from Mutation Events, that would be a shame. Is there anyone reading this who can chime in here or page someone who can?

I think a way forward for us is to first understand what we can all agree on in regards to goals/non-goals.

Is everone in agreement that:
- We're concerned with the connectedness of any node, and not just elements?
- We want multiple observers to be able to observe the connectedness of a node simultaneously?

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