" style="-webkit-flex: 1 0 0; max-width: 100px;"></div>
  <div data-expected-width="100" data-offset-x="250" style="width: 100px;"></div>
  <div data-expected-width="100" data-offset-x="450" style="width: 100px;"></div>
</div>

<!-- If there's only one child, we justify-content center. -->
<div class="flexbox" style="-webkit-justify-content: space-around">
  <div data-expected-width="100" data-offset-x="250" style="-webkit-flex: 1 0 0; max-width: 100px;"></div>
</div>

<!-- True centering on overflow. -->
<