HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>moveBefore null</title>
  <style>
    section { min-height: 60px; padding: 8px; margin: 6px; border: 2px solid #333; }
    #section1 { background: hotpink; }
    #section2 { background: orange; }
    #mover { background: #ffe082; padding: 8px; display: inline-block; }
  </style>
</head>
<body>
  <section id="section1"><div id="mover">Mover box</div></section>
  <section id="section2"><p>Empty target</p></section>
  <button type="button" id="btn">Toggle section</button>
  <pre id="out">—</pre>
  <script>
    var section1 = document.getElementById("section1");
    var section2 = document.getElementById("section2");
    var mover = document.getElementById("mover");
    function moveNode(parent, node, ref) {
      if (typeof parent.moveBefore === "function") parent.moveBefore(node, ref);
      else parent.insertBefore(node, ref);
    }
    document.getElementById("btn").onclick = function () {
      if (mover.parentElement === section1) {
        moveNode(section2, mover, null);
        document.getElementById("out").textContent = "Appended to Section 2";
      } else {
        moveNode(section1, mover, null);
        document.getElementById("out").textContent = "Appended to Section 1";
      }
    };
  </script>
</body>
</html>

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Element.moveBefore — null append (Try It)