

All blue boxes are 100x100px with box-sizing: border-box and 2px border (4px border-top), we expect offsetWidth/Height to be <b>100x100</b>

<h3>flex-flow: default, orange box has width: 300px</h3>
<div class="flexbox" style="width: 300px">
    <div></div><div></div><div></div>
</div>

<h3>flex-flow: default, orange box has width: 400px</h3>
<div class="flexbox" style="width: 400px">
    <div></div><div></div><div></div>
</div>

<h3>flex-flow: default, orange box has width: auto</h3>
<div class="flexbox">