<!DOCTYPE html>
<html>
<head>
<style>
table {
border: 1px solid black;
height: 100px;
}
</style>
</head>
<body>
<table>
<tr>
<td id="myTd">Some example text</td>
</tr>
</table>
<br>
<button type="button" onclick="myFunction()">Align text</button>
<script>
function myFunction() {
document.getElementById("myTd").style.verticalAlign="bottom";
}
</script>
</body>
</html>