HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>prepend element</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var div = document.createElement("div");
    var p = document.createElement("p");
    var span = document.createElement("span");
    p.textContent = "p";
    span.textContent = "span";
    div.append(p);
    div.prepend(span);

    document.getElementById("out").textContent =
      div.childNodes.length + "\n" +
      div.childNodes[0].nodeName + ", " + div.childNodes[1].nodeName;
  </script>
</body>
</html>

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Element.prepend — prepend element (Try It)