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Test Info:

<!DOCTYPE HTML>
<html><head>
<meta charset="utf-8">
<title>Tests :nth-child(An+B) matching</title>
<style type="text/css">
div :nth-child(+3N/**/-2) { background-color:black; }
div :nth-child(+3N/**/-2) { font-size:12px; }
div :nth-child(+3N-/**/2) { text-decoration: underline; }
div :nth-child(+3N-2/**/) { border-left-width: 1px; }
div :nth-child(+3N/**/-2) { border-top-width: 1px; }
div :nth-child(+3N/**/-2) { border-bottom-width: 1px; }
div :nth-child(+3N-/**/2) { border-right-width: 1px; }
div :nth-child(+3N-2/**/) { border-style: solid; border-color: blue;}
/* valid but will not match anything */
div :nth-child(-N/**/-2) { color:red; }
div :nth-child(-N/**/-2) { color:red; }
div :nth-child(-N-/**/2) { color:red; }
div :nth-child(-N-2/**/) { color:red; }
div :nth-child(-1N/**/-2) { color:red; }
div :nth-child(-1N/**/-2) { color:red; }
div :nth-child(-1N-/**/2) { color:red; }
div :nth-child(-1N-2/**/) { color:red; }
/* invalid */
div :nth-child(-/**/ N-2) { color:red; }
div :nth-child(- /**/N-2) { color:red; }
div :nth-child(+/**/ N-2) { color:red; }
div :nth-child(+ /**/N-2) { color:red; }
div :nth-child(+3/**/N-2) { color:red; }
div :nth-child(-/**/N-2) {color: red;}
</style>
</head>
<body>
<div><x>x</x><x>x</x><x>x</x><x>x</x><x>x</x><x>x</x><x>x</x><x>x</x><x>x</x><x>x</x><x>x</x></div>
</body>
</html>