[whatwg/dom] How should `clonable` work in `cloneNode(false)`? (Issue #1249)

### What is the issue with the DOM Standard?

This issue was [raised as part of the Chromium review](https://chromium-review.googlesource.com/c/chromium/src/+/5239277/comment/3d66eb39_1ccfcf33/) of the implementation of `clonable`. The question is what should happen here:

```javascript
const shadow = host.attachShadow({mode: 'open', clonable: true});
shadow.innerHTML = '<div><span>what about me?</span></div>`;
const clone = host.cloneNode(false);
```

What should happen to the shadow root? Since it is clonable, I'd expect `clone` to have a shadow root, with parameters that match `shadow`. But should the *content* of that shadow root be deep-cloned from `host`? Or should `clone.shadowRoot` be empty? Both of those feel slightly odd. I think I slightly prefer deep-cloning the shadow content, but I'm not sure.

@dbaron @annevk @saschanaz 


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