HTML Code

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

    p.before(span);

    document.getElementById("out").textContent = container.outerHTML;
  </script>
</body>
</html>

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Element.before — insert element (Try It)