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<!DOCTYPE html>
<title>flexbox | flexcontainer via generated content</title>
<style>
div {
background: #3366cc;
border: 1px solid black;
}
div::after {
content: "xxx";
background: yellow;
margin: 1em;
width: 200px;
height: 2em;
display: block;
}
</style>
<div>
</div>