xpected-height="30" class="flexbox horizontal" style="-webkit-align-content: space-around; height: 30px">
  <div data-offset-x="0" data-offset-y="-15" data-expected-height="20"></div>
  <div data-offset-x="100" data-offset-y="-15" data-expected-height="20"></div>
  <div data-offset-x="0" data-offset-y="5" data-expected-height="20"></div>
  <div data-offset-x="0" data-offset-y="25" data-expected-height="20"></div>
</div>

<!-- Stretch should only grow, not shrink. -->
<div data-expected-height="30" class="fl