HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>insertBefore after</title>
</head>
<body>
  <div id="parent">
    <span id="childElement">foo</span>
  </div>
  <pre id="out"></pre>
  <script>
    var parentDiv = document.getElementById("parent");
    var sp2 = document.getElementById("childElement");
    var sp1 = document.createElement("span");
    sp1.textContent = "AFTER";
    parentDiv.insertBefore(sp1, sp2.nextSibling);
    document.getElementById("out").textContent =
      sp2.nextElementSibling.textContent;
  </script>
</body>
</html>

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Node.insertBefore — insertAfter pattern (Try It)