    <div class="a" data-expected-width="10" data-expected-height="20" data-offset-x="198" data-offset-y="96"></div>
      <div class="b" data-expected-width="30" data-expected-height="20" data-offset-x="168" data-offset-y="96"><div class="fixedSizeChild" data-expected-width="30" data-expected-height="10" data-offset-x="168" data-offset-y="96"></div></div>
    </div>
    <div class="flexbox" style="align-content: flex-start">
      <div class="a" data-expected-width="10" data-expected-height="20" data-offset