
<label id="label1">
  <div id="host1">slotted</div>
</label>
<button id="labelled1"
        class="labelled"
        type="button"
        aria-labelledby="label1"
        data-expectedlabel="foo slotted bar"
        data-testname="aria-labelledby reference to element with slotted text content"></button>

<label id="label2">
  <div id="host2"></div>
</label>
<button id="labelled2"
        class="labelled"
        type="button"
        aria-labelledby="label2"
        data-expectedlabel="foo default bar"
  