apper>
    <div style="display: contents">
      <template shadowrootmode=open>
        <slot></slot>
      </template>
      <button id="A" style="order: 2">A</button>
      <button id="B" style="order: 1">B</button>
    </div>
    <button id="C" style="order: 3">C</button>
  </div>
</div>

<script>
runFocusTestCases();
</script>
