domxpath/document.tentative.html

<!doctype html>
<title>XPath parent of documentElement</title>
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<body>
<script>
test(function() {
  var result = document.evaluate("..", // expression
                                document.documentElement, // context node
                                null, // resolver
                                XPathResult.ANY_TYPE, // type
                                null); // result
  var matched = [];
  var cur;
  while ((cur = result.iterateNext()) !== null) {
    matched.push(cur);
  }
  assert_array_equals(matched, [document]);
  // Evaluate again, but reuse result from previous evaluation.
  result = document.evaluate("..", // expression
                            document.documentElement, // context node
                            null, // resolver
                            XPathResult.ANY_TYPE, // type
                            result); // result
  matched = [];
  while ((cur = result.iterateNext()) !== null) {
    matched.push(cur);
  }
  assert_array_equals(matched, [document]);
});
</script>