Re: [whatwg/dom] Should attachShadow throw or override when an existing declarative shadow root doesn't match? (Issue #1235)

I don't know, that makes code like this potentially fail in a very action-at-a-distance way, and with no pointer to the root cause of the issue (a `shadowrootmode=closed` template):

```js
host.attachShadow({ mode: "open" });
host.shadowRoot.appendChild(...);
```

I guess we could add a console warning or so... Maybe it's worth a note in the spec?

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