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

I was getting started thinking about this change, and another case comes up. What should happen here?

```html
<div>
  <template shadowrootmode=open>Root 1</template>
  <template shadowrootmode=closed>Root 2</template>
</div>
```

In current behavior and spec, there will be an `open` shadow root attached which contains "Root 2", because the "attach a shadow root" algorithm will clear out the first (open) root and insert "Root 2". We can't throw in the parser. Should this just be the console warning case?

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