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

annevk left a comment (whatwg/dom#1407)

Note by the way that
```
test(() => {
    const registry = new CustomElementRegistry;
    const host = document.body.appendChild(document.createElement('div', {customElementRegistry: registry}));
    const shadowRoot = host.attachShadow({mode: 'closed', customElementRegistry: null});
    assert_equals(shadowRoot.customElementRegistry, registry);
}, 'attachShadow() should use the shadow host\'s registry when customElementRegistry is null');
```
also tests this. The main thing that's missing I think is a declarative shadow root setup as the WebKit bug hints at there being an issue there.

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