<!DOCTYPE html>
<html>
<head>
<style>
.flexContainer {
display: flex;
/* Just for easier visualization: */
width: 600px;
justify-content: space-around;
border: 1px solid black;
}
.flexContainer:before {
position:absolute;
content:'before';
}
.flexContainer:after {
position:absolute;
content:'after'
}
</style>
</head>
<body>
<div class="flexContainer">
<div class="ordered-item">NormalFlexItem
<!-- It's important that this remain unclosed, for some reason. -->