HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>insertAdjacentElement MDN</title>
  <style>
    .box { padding: 8px; margin: 4px; border: 2px solid #333; display: inline-block; }
    .new { background: #d4edda; }
  </style>
</head>
<body>
  <div id="target" class="box">Target</div>
  <p>
    <button type="button" id="beforeBtn">Insert before</button>
    <button type="button" id="afterBtn">Insert after</button>
  </p>
  <pre id="out">Click a button</pre>
  <script>
    var target = document.getElementById("target");
    var out = document.getElementById("out");
    function insertAt(position) {
      var el = document.createElement("div");
      el.className = "box new";
      el.textContent = "New";
      target.insertAdjacentElement(position, el);
      out.textContent = "Inserted " + position;
    }
    document.getElementById("beforeBtn").onclick = function () { insertAt("beforebegin"); };
    document.getElementById("afterBtn").onclick = function () { insertAt("afterend"); };
  </script>
</body>
</html>

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Element.insertAdjacentElement — MDN before/after (Try It)