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chromium/third_party/blink/web_tests/fast/xpath/4XPath/Core/test_step.html 

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

<script>
    result = DOM.evaluate("ancestor::*", CHILD1, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
    checkSnapshot("ancestor::*", result, [ROOT]);

    result = DOM.evaluate("ancestor-or-self::*", CHILD1, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
    checkSnapshot("ancestor-or-self::*", result, [ROOT, CHILD1]);

    result = DOM.evaluate("descendant-or-self::GCHILD", CHILD1, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
    checkSnapshot("descendant-or-self::*", result, GCHILDREN1);

    result = DOM.evaluate("child::GCHILD[position()=1]", CHILD1, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
    checkSnapshot("child::GCHILD[position()=1]", result, [GCHILD11]);

    result = DOM.evaluate("child::GCHILD[1]", CHILD1, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
    checkSnapshot("child::GCHILD[1]", result, [GCHILD11]);

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