div::before background: black;
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en'>
<head>
<meta http-equiv='Content-Type' content='text/html; charset=UTF-8' />
<title>Generated content</title>
<style type='text/css'>
div {
font-family: sans-serif;
}
div::before {
content: "I said, \"Hello, world!\"";
background: black;
color: white;
margin-right: 25px;
}
</style>
</head>
<body>
<div>The world said, "Hello, yourself!"</div>
</body>
</html>
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