0" data-offset-x="100" style="width: 100px; margin-right: auto"></div>
  <div data-expected-width="100" data-offset-x="500" style="width: 100px;"></div>
</div>

<!-- The justify-content does nothing here because we are shrinking. -->
<div class="flexbox" style="-webkit-justify-content: flex-end">
  <div data-expected-width="200" data-offset-x="0" style="-webkit-flex: 0 1 300px;"></div>
  <div data-expected-width="200" data-offset-x="200" style="width: 200px;"></div>
  <div data-expected-width="200" data-off