HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>insertAdjacentText afterbegin</title>
</head>
<body>
  <span id="label">Original label</span>
  <button type="button" id="btn">Add prefix</button>
  <pre id="out">—</pre>
  <script>
    document.getElementById("btn").onclick = function () {
      var label = document.getElementById("label");
      label.insertAdjacentText("afterbegin", "Note: ");
      document.getElementById("out").textContent = label.textContent;
    };
  </script>
</body>
</html>

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Element.insertAdjacentText — afterbegin prefix (Try It)