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

Here's a serialization of that:

```js
<parent-element>
</parent-element>
<script>
"use strict";

const shadowRoot = document.currentScript.previousElementSibling.attachShadow({ mode: "open" });
shadowRoot.innerHTML = `<child-element></child-element>`;

const shadowRoot2 = shadowRoot.firstElementChild.attachShadow({ mode: "open" });
shadowRoot2.innerHTML = `<foo-bar>...</foo-bar>`;
</script>
```

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