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

FrameMuse left a comment (whatwg/dom#533)

@LeaVerou I think you misinterpret it, with `DOMParser` you create a brand new document, thus you have all the elements are "connected". `isConnected` is true only when it's connected to a document, so

```js
div = document.createElement("div")
div.append(123)
div.childNodes[0].isConnected // => false

document.body.append(div)
div.childNodes[0].isConnected // => true
```

though `ownerDocument` will stay the same.

So why we need connection (`isConnected`) observer? When an element is disconnected, we want any associated subscriptions to be unsubscribed and when it's connected - subscribe back. Another use-case is to enforce placement of an element as you can track where it's connected/disconnected from and add it back - this particular use-case can solve fundamental issues for "fragments".

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