File: node-set-tree-order.html

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<!DOCTYPE html>
<html>
<head>
  <title>Tree order of node sets during evaluation</title>
  <link rel="author" title="Simon Wülker" href="mailto:simon.wuelker@arcor.de">
  <link rel="help" href="https://github.com/servo/servo/issues/40435">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
</head>
<body>
    <div id="container">
        <span></span>
        <p id="p"></p>
    </div>
    <script>
    function toArray(result) {
      var a = [];
      while (true) {
        var node = result.iterateNext();
        if (node === null) break;
        a.push(node);
      }
      return a;
    }

    let container = document.getElementById("container");
    test(() => {
      // If the result of "(./p | ./span)" is not in tree order then "last()" will filter the wrong element,
      // causing the span to be returned.

      let result = document.evaluate("(./p | ./span)[last()]", container, null, XPathResult.ORDERED_NODE_ITERATOR_TYPE, null);
      assert_array_equals(toArray(result), [document.getElementById("p")])
    }, "Temporary node sets created during evaluation must be in tree order");
    </script>
</body>
</html>