tyle="display: contents">
      <button id="order3" style="order: 3">Order 3</button>
      <button id="order1" style="order: 1">Order 1</button>
      <div style="display: contents">
        <button id="order4" style="order: 4">Order 4</button>
        <button id="order2" style="order: 2">Order 2</button>
      </div>
    </div>
  </div>
</div>

<div class="test-case" data-expect="div1B,order1B,div2B,order2B,order4B,order3B"
      data-description="Items in display contents are sorted in same grid containe