Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
    border: 1px solid black;
}
</style>
</head>
<body>

<h3>A demonstration of how to access a CAPTION element</h3>

<table>
  <caption id="myCaption">Monthly savings</caption>
  <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>

<p>Click the button to set the color of the caption to red.</p>

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

<script>
function myFunction() {
    var x = document.getElementById("myCaption");
    x.style.color = "red";
}
</script>

</body>
</html>