I don't understand why flexbox container, normally working ONLY on direct child, can work on this kind of structure:
<div class="flex-container">
<div class="row">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
</div>
</div>
taken from topic stackoverflow. Direct child of flex container is div.row, so how it could works on div.flex-items?