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

The explainer [proposes](https://github.com/WICG/webcomponents/blob/gh-pages/proposals/reference-target-explainer.md#javascript-attributes-that-reflect-element-objects) that IDL attribute _getters_ not return the `referenceTarget` element, and I strongly agree there.

However, this leaves open the question of what should happen with IDL attribute _setters_.

```html
<input id="input">
<fancy-listbox id="listbox">
  <template
    shadowrootmode="open"
    shadowrootreferencetarget="real-listbox"
  >
    <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>
```

```js
input.ariaControlsElements = [ listbox ];
```

In this case, should the `aria-controls` relationship be with the `<fancy-listbox>`, or the `<div role="listbox">`?

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