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chromium/third_party/blink/web_tests/fast/xpath/reverse-axes.html 

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<script src="../../resources/js-test.js"></script>
<script src="xpath-test-pre.js"></script>
</head>
<body>
<p>Test for <a href="http://bugs.webkit.org/show_bug.cgi?id=15436">bug 15436</a>:
Wrong proximity positions for XPath reverse axes.</p>

<div id="d">
  <div id="d1"></div>
  <div id="d2">
    <div id="d21"></div>
  </div>
  <div id="d3">
    <div id="d31"></div>
  </div>
</div>

<div id="console"></div>

<script>

    shouldBe("document.evaluate('preceding-sibling::*[1]', document.getElementById('d3'), null, XPathResult.ANY_UNORDERED_NODE_TYPE, null).singleNodeValue.id", "'d2'");

    shouldBe("document.evaluate('preceding::*[1]', document.getElementById('d31'), null, XPathResult.ANY_UNORDERED_NODE_TYPE, null).singleNodeValue.id", "'d21'");
    shouldBe("document.evaluate('preceding::*[2]', document.getElementById('d31'), null, XPathResult.ANY_UNORDERED_NODE_TYPE, null).singleNodeValue.id", "'d2'");
    shouldBe("document.evaluate('preceding::*[3]', document.getElementById('d31'), null, XPathResult.ANY_UNORDERED_NODE_TYPE, null).singleNodeValue.id", "'d1'");
    shouldBe("document.evaluate('preceding::*[4]', document.getElementById('d31'), null, XPathResult.ANY_UNORDERED_NODE_TYPE, null).singleNodeValue.tagName", "'A'");
    shouldBe("document.evaluate('preceding::*[5]', document.getElementById('d31'), null, XPathResult.ANY_UNORDERED_NODE_TYPE, null).singleNodeValue.tagName", "'P'");

    shouldBe("document.evaluate('ancestor::*[1]', document.getElementById('d31'), null, XPathResult.ANY_UNORDERED_NODE_TYPE, null).singleNodeValue.id", "'d3'");

    shouldBe("document.evaluate('ancestor-or-self::*[1]', document.getElementById('d31'), null, XPathResult.ANY_UNORDERED_NODE_TYPE, null).singleNodeValue.id", "'d31'");

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