ght="40"></div>
</div>

<!-- Negative overflow goes out the top. -->
<div data-expected-height="30" class="flexbox horizontal" style="-webkit-align-content: flex-end; height: 30px">
  <div data-offset-x="0" data-offset-y="-30" data-expected-height="20"></div>
  <div data-offset-x="100" data-offset-y="-30" data-expected-height="20"></div>
  <div data-offset-x="0" data-offset-y="-10" data-expected-height="20"></div>
  <div data-offset-x="0" data-offset-y="10" data-expected-height="20"></div>
</div>

<!-- If w