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<!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>