<!DOCTYPE html>
<link href="resources/flexbox.css" rel="stylesheet">
<style>
.flexbox, .inline-flexbox {
    -webkit-column-count: 2;
    -webkit-column-gap: 100px;
    width: 20em;
}
</style>
<div class="flexbox">
AAAAAAAAAA BBBBBBBBBB CCCCCCCCCC DDDDDDDDDD
</div>

<div class="inline-flexbox">
AAAAAAAAAA BBBBBBBBBB CCCCCCCCCC DDDDDDDDDD
</div>