<!doctype html>
<html>
<head>
<script src="../../resources/js-test-pre.js"></script>
<style>
#test-root * {
    background-color: red;
}
</style>
<style id="style">
</style>
</head>
<body>
    <div style="display:none" id="test-root">
    </div>
</body>
<script>
description('Test boundaries of :nth-child(An+B).');

// First, let's generate a giant DOM tree to have something to match.

function generateSubtree(parent, level) {
    if (level < 0)
        return;

    for (var i = 0; i < level; ++i) {
        var testCase = document.createElement("testcase");
        testCase.className="testclass"
        generateSubtree(testCase, level - 1);
        parent.appendChild(testCase);
    }
}

var testRoot = document.getElementById('test-root');
generateSubtree(testRoot, 7);

// Test backtracking nesting. This does not test backtracking correctness, just compilation and execution.
var siblingBacktracking = ':nth-child(n+2 of .testclass:nth-child(n+2 of .testclass$$>.testclass>.testclass .testclass)>.testclass>.testclass .testclass)';
var previousChain = ':nth-child(n+2 of .testclass>.testclass>.testclass .testclass)'
for (var i = 0; i < 20; ++i) {
    previousChain = siblingBacktracking.replace('$$', previousChain)
    shouldBe('document.querySelectorAll("' + previousChain + '").length', '0');
    shouldBe('document.querySelectorAll("' + previousChain + '+.testclass+.testclass~testcase").length', '0');
    shouldBe('document.querySelectorAll("' + previousChain + '>.testclass>.testclass testcase").length', '0');
    shouldBe('document.querySelectorAll("' + previousChain + '+.testclass+.testclass~testcase>.testclass>.testclass testcase").length', '0');
}
</script>
<script src="../../resources/js-test-post.js"></script>
</html>