LayoutTests/fast/flexbox/block-axis.html

<div style="width: 100px; height: 100px; background-color: red; display: -webkit-box; -webkit-box-orient: block-axis;">
    <div style="height: 50px; background-color: green;"></div>
    <div style="height: 50px; background-color: green;"></div>
</div>