Re: [WICG/webcomponents] [scoped-registries] Finding a definition for disconnected elements (Issue #1040)

@annevk 

> "I need to look at my parent for the registry" 

Noting that this is a change from the [proposal in the explainer](https://github.com/WICG/webcomponents/blob/gh-pages/proposals/Scoped-Custom-Element-Registries.md#finding-a-custom-element-definition) which says the registry is found by getting the context node's root (aka `getRootNode()`)

What happens here?

```js
const registry1 = new CustomElementRegistry();
registry1.define('x-foo', class XFooScoped extends HTMLElement {});
const shadowRoot1 = createConnectedShadowTree(registry1);

const div = document.createElement('div');
shadowRoot1.append(div);
div.innerHTML = `<x-foo></x-foo>`;
xFoo = div.firstChild;

xFoo instanceof XFooScoped // is this true?
customElements.define('x-foo', class XFooGlobal extends HTMLElement {});
xFoo instanceof XFooGlobal // is this true?
```

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