<!doctype html>
<html>
<head>
<style>
/* 3n of paragraph with the class foobar but for which foobar is not the only class. */
p:nth-child(3n+1 of p.foobar:not([class=foobar])) {
    background-color: lime;
}
</style>
</head>
<body>
    <p class="foobar foo"></p>
    <p>This test the styling of paragraphs with :nth-child(An+B of selector). If the test succeed, paragraphs that say "green" should have a green background.</p>
    <p class="foobar">White!</p>
    <p class="foobar foo">White!</p>
    <p>White!</p>
    <p class="foo foobar">White!</p>
    <p>White!</p>
    <p class="foobar foo">Green</p>
    <p class="foobar">White!</p>
    <p class="foo foobar">White!</p>
    <p class="foobar">White!</p>
    <p class="foo foobar baz">White!</p>
    <p>White!</p>
</body>
</html>