HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>previousNode filter</title>
</head>
<body>
  <div id="box">
    <span class="pick">A</span>
    <span>skip</span>
    <span class="pick">B</span>
  </div>
  <pre id="out">Waiting...</pre>
  <script>
    var it = document.createNodeIterator(
      document.getElementById("box"),
      NodeFilter.SHOW_ELEMENT,
      {
        acceptNode: function (node) {
          return node.classList.contains("pick")
            ? NodeFilter.FILTER_ACCEPT
            : NodeFilter.FILTER_REJECT;
        }
      }
    );
    it.nextNode();
    it.nextNode();
    var back = it.previousNode();
    document.getElementById("out").textContent = back.textContent.trim();
  </script>
</body>
</html>

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NodeIterator.previousNode() — with filter (Try It)