HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>createNodeIterator previous</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <ul id="list">
    <li>One</li>
    <li>Two</li>
    <li>Three</li>
  </ul>
  <button id="btn" type="button">next, next, previous</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var it = document.createNodeIterator(
        document.getElementById("list"),
        NodeFilter.SHOW_ELEMENT,
        function (node) {
          return node.nodeName.toLowerCase() === "li"
            ? NodeFilter.FILTER_ACCEPT
            : NodeFilter.FILTER_REJECT;
        }
      );
      var first = it.nextNode();
      var second = it.nextNode();
      var back = it.previousNode();
      document.getElementById("out").textContent = [
        first.textContent.trim(),
        second.textContent.trim(),
        back.textContent.trim()
      ].join(" ");
    });
  </script>
</body>
</html>

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Document.createNodeIterator — previousNode (Try It)