<html>
<head>
<script>
function displayResult()
{
alert(document.getElementById('myTable').summary);
}
</script>
</head>
<body>
<table id="myTable" border="1" summary="Example table of employees">
<tr>
<th>Firstname</th>
<th>Lastname</th>
</tr>
<tr>
<td>Peter</td>
<td>Griffin</td>
</tr>
<tr>
<td>John</td>
<td>Doe</td>
</tr>
</table>
<br>
<button type="button" onclick="displayResult()">Show table summary</button>
</body>
</html>