Re: [WICG/webcomponents] Reference Target: How should we treat invalid reference targets for relations set via Element IDL attributes? (Issue #1089)

@dandclark Yes to all of that, except that I'm a little unclear on this line: 

```js
document.querySelector("#fancy-listbox").shadowRoot.referenceTarget = "";
```

I would have expected an empty string to work like an invalid ID, rather than like an un-set. To un-set, I would have expected we'd need to set `referenceTarget` to `null`, similar to setting an attribute to `null` to remove it.

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