This code sample demonstrates how to flow data into a Flexbox using CSS Regions.
// CSS
.content-source {
-ms-flow-into: content;
}
.s2-flex-box {
display: -ms-flexbox;
}
.s2-region {
-ms-flow-from: content;
width: 300px;
height: 150px;
border: 1px solid #ccc;
}
// HTML
<iframe class="content-source" src="content.html"></iframe>
<div class="s2-flex-box">
<div class="s2-region"></div>
<div class="s2-region"></div>
<div class="s2-region"></div>
</div>