<!DOCTYPE html>
<title>flexbox | flexcontainer vs generated content</title>
<link rel="author" href="http://opera.com" title="Opera Software">
<style>
div {
	background: #3366cc;
	height: 4em;
}
div::after, p {
	content: "xxx";
	background: yellow;
	margin: 1em;
	width: 200px;
	height: 2em;
	float: left;
}
div::after {
	content: "yyy";
	display: block;
}
</style>

<div>
	<p>FAIL</p>
</div>