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<!DOCTYPE html>
<html class="html">
<head class="head">
<meta charset=utf-8 />
<style>
.before:before {
content: "before";
}
</style>
</head>
<body class="body">
<h1>Test void elements in HTML document</h1>
<img>
<hr>
<hr class="before">
<br>
</body>
</html>