File: xpath-result-single-node-value-nullable.html

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<!DOCTYPE html>
<meta charset="UTF-8">
<title>XPathResult singleNodeValue should be nullable</title>
<link rel=help href="https://dom.spec.whatwg.org/#dom-xpathresult-singlenodevalue">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<div id="div">
  <span id="exist"></span>
</div>
<script>
test(() => {
  const div = document.getElementById('div');

  const isNull = document.evaluate(
    '//non-span',
    div,
    null,
    XPathResult.FIRST_ORDERED_NODE_TYPE,
    null
  );
  assert_equals(isNull.singleNodeValue, null);

  const isNotNull = document.evaluate(
    '//span',
    div,
    null,
    XPathResult.FIRST_ORDERED_NODE_TYPE,
    null
  );
  assert_not_equals(isNotNull.singleNodeValue, null);
}, 'singleNodeValue should be nullable');
</script>
</body>