<!DOCTYPE html>
<title>flexbox | flexcontainer via generated content</title>
<link rel="author" href="http://opera.com" title="Opera Software">
<link rel="help" href="http://www.w3.org/TR/css-flexbox-1/#flex-container">
<link rel="match" href="flexbox_generated-flex-ref.html">
<style>
div {
background: #3366cc;
border: 1px solid black;
}
div::after {
content: "xxx";
background: yellow;
margin: 1em;
width: 200px;
height: 2em;
display: flex;
}
</style>
<div>
</div>