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

If I understand this correctly, connected-ness means if a Node appears in the document or not. If so, I'd like to share my use case.
I have a `span` element and I want to mount my application on it when the `span` has been inserted in the document (I cannot control when it will be mounted). If I mount the application on the `span` when it is disconnected, it will throw an error cause most of our code doesn't assume that.

Now I have two choices, attach an event listener of deprecated `DOMNodeInserted` on the `span`, or add a `childList` `MutationObserver` on the whole document then use `document.contains`. I don't know which one hurts the performance mostly and they both don't seem like a good option.

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