Re: [w3c/webcomponents] Allowing serialized access to custom element implementation DOM for web archival benefits (#657)

Can you provide an example of what you mean? 

Here's a scenario:
```
<parent-element>
  // Shadow DOM
  <child-element>
    // Shadow DOM
    <foo-bar>...</foo-bar>
  </child-element> 
</parent-element>
```

So then `<parent-element>.shadowRoot.innerHTML` returns `<child-element></child-element>`, but there is no way to know that <foo-bar></foo-bar> is there within the child's Shadow DOM.

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