Re: [whatwg/dom] Set registry on null registry element on adopt instead of on insert (PR #1423)

@annevk commented on this pull request.



> +     <li>
+      <p>If <var>inclusiveDescendant</var> is a <a for=/>shadow root</a>:
+
+      <ol>
+       <li><p>if <var>inclusiveDescendant</var>'s <a for=ShadowRoot>custom element registry</a>
+       is null or <var>inclusiveDescendant</var>'s <a for=ShadowRoot>custom element registry</a>'s
+       <a for=CustomElementRegistry>is scoped</a> is false, then set
+       <var>inclusiveDescendant</var>'s <a for=ShadowRoot>custom element registry</a> to
+       <var>document</var>'s <a>effective global custom element registry</a>.

How do we distinguish the case of a shadow root from a null document registry without the attribute from one with the attribute?

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