Re: [whatwg/dom] attachShadow default custom element registry (Issue #1407)

ja-y-son left a comment (whatwg/dom#1407)

I'm also seeing the same output as Justin running the above example (Release 221 (WebKit 20622.1.15.19.2))

With Justin's snippet, it seems like a bug on webkit if the original intention was to follow the spec:
```
const aElement = document.createElement('x-a')
aElement.shadowRoot.querySelector('my-x-b').customElementRegistry === registryA      // true
aElement.shadowRoot.querySelector('my-x-b').shadowRoot.customElementRegistry === window.customElements    // true
```

Regardless, I think shadow root **not inheriting** host's registry is a better option to ensure the backward compatibility and the isolation between scopes.


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