Re: [w3ctag/design-reviews] Declarative Shadow DOM (#494)

Regarding the timing of attachment, we noted that the primary reason for attaching the shadow root was due to implementation complexity.

This is explicitly counter to the reasoning in the [priority of constituencies](https://w3ctag.github.io/design-principles/#priority-of-constituencies).

I understand that a non-zero number of pages are of the form 

```html
<my-app>
  #shadowroot
    <rest>
       <of>
          <the>
             <app>
</my-app>
```

For these pages, it seems like the entire page would need to be parsed before any content would show up. Is that right?

Is there any chance of revisiting this decision?

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