Re: [whatwg/dom] Declarative Shadow DOM (#831)

> @mfreed7 how can you do a closed declarative shadow root with a `<div>`? I don't think you can. And think we should maintain parity between open and closed.

```html
<div>
  <template shadowrootmode=closed> I'm closed! </template>
</div>
```

Maybe I'm missing what you're asking.


> (In retrospect it was probably a mistake to allow them on anything but custom elements (in userland, that is). `attachShadow()` on `ElementInternals` would have removed the need for a lot of bookkeeping.)

Hmm, I suppose I'd be interested in hearing more about why. The biggest complaint I hear about web components is that too many behaviors are tied together into one package. E.g. shadow dom encapsulates *everything*, and you can't opt out of parts of that. Further tying things together seems to run counter to that developer feedback.

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