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chromium/third_party/blink/web_tests/fast/xpath/invalid-functions.html 

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<script src="../../resources/js-test.js"></script>
</head>
<body>
<div id="console"></div>

<script>
    shouldThrow('document.createExpression("foobar()", null)');
    shouldThrow('document.evaluate("foobar()", document, null, XPathResult.ANY_TYPE, null)');

    shouldThrow('document.createExpression("position(//div)", null)');
    shouldThrow('document.evaluate("position(//div)", document, null, XPathResult.ANY_TYPE, null)');

    shouldThrow('document.createExpression("ceiling(1,2)", null)');
    shouldThrow('document.evaluate("ceiling(1,2)", document, null, XPathResult.ANY_TYPE, null)');
    shouldThrow('document.createExpression("ceiling(1,2)", null).evaluate(document, XPathResult.ANY_TYPE, null)');

    shouldThrow('document.createExpression("boolean()", null)');
    shouldThrow('document.evaluate("boolean()", document, null, XPathResult.ANY_TYPE, null)');

</script>
</body>
</html>