Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
    border: 1px solid black;
    margin-top: 20px;
}
</style>
</head>
<body>

<p>Click the button to create a CAPTION element.</p>

<button onclick="myFunction()">Try it</button>

<table id="myTable">
  <tr>
    <th>Month</th>
    <th>Savings</th>
  </tr>
  <tr>
    <td>January</td>
    <td>$100</td>
  </tr>
  <tr>
    <td>February</td>
    <td>$50</td>
  </tr>
</table>

<script>
function myFunction() {
    var x = document.createElement("CAPTION");
    var t = document.createTextNode("Monthly savings");
    x.appendChild(t);

    var table = document.getElementById("myTable")
    table.insertBefore(x, table.childNodes[0]);
}
</script>

</body>
</html>