HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>previousElementSibling chain</title>
</head>
<body>
  <div id="div-01">Here is div-01</div>
  <div id="div-02">Here is div-02</div>
  <li>This is a list item</li>
  <li>This is another list item</li>
  <div id="div-03">Here is div-03</div>
  <pre id="out"></pre>
  <script>
    var el = document.getElementById("div-03").previousElementSibling;
    var names = [];
    while (el) {
      names.push(el.nodeName);
      el = el.previousElementSibling;
    }
    document.getElementById("out").textContent = "Siblings: " + names.join(", ");
  </script>
</body>
</html>

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Element.previousElementSibling — backward chain (Try It)