Re: [WICG/webcomponents] Reference Target: What about IDL attributes? (Issue #1089)

Another question related to this and to #1071: what should happen in this case?

```html
<input id="input">
<fancy-listbox id="listbox">
  <template
    shadowrootmode="open"
    shadowrootreferencetarget="BAD_ID"
  >
    <div id="real-listbox" role="listbox">
      <div id="option-1" role="option">Option 1</div>
      <div id="option-2" role="option">Option 2</div>
    </div>
  </template>
</fancy-listbox>
```

```
input.ariaControlsElements = [ listbox ];
console.log(input.ariaControlsElements);  // what does this log?
```

Should it log the `fancy-listbox`, even though the reference target is invalid? Or should it log an empty list, _because_ the reference target is invalid?

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