Re: [WICG/webcomponents] [Scoped Registries] Can disconnected elements can retain their shadowroot via dangling treeroot pointer? (Issue #1078)

@rniwa the constructor functions run though, right? And so `instanceof` checks pass. For example:

```js
customElements.define('foo-bar', class extends HTMLElement {
  constructor() {
    super()
    console.log('FooBar element was constructed')
  }
})
let div = document.createElement('div')
div.innerHTML = '<foo-bar></foo-bar>'
```

I wrote up some WPTs for this here: https://github.com/web-platform-tests/wpt/pull/46170

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