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Test Info:

<!DOCTYPE html>
<meta charset=utf-8>
<link rel="match" href="pseudo-elements-ref.html">
<body>
<div>
The install element should not create any pseudo elements.
</div>
<style>
install::before, install::after { content: "FAIL"; }
</style>
<p>You should not see the word FAIL below.</p>
<install></install>
</body>
</html>