<!DOCTYPE html><html><head>
<title>Negation pseudo-class can be an argument of itself</title>
<style type="text/css">p { background-color : red }
p:not(:not(p)) { background-color : green }</style>
<link rel="author" title="Daniel Glazman" href="http://glazman.org/">
<link rel="help" href="https://drafts.csswg.org/selectors-4/#negation-pseudo">
<link rel="match" href="css3-modsel-83-ref.xml">
</head>
<body>
<p>This paragraph should have a green background</p>
</body></html>