<html>
<head>
<script>
function padding(id) {
document.getElementById(id).style.padding = "15px";
}
</script>
</head>
<body>
<table id="myTable" style="border:1px solid black">
<tr>
<td>100</td>
<td>200</td>
</tr>
<tr>
<td>300</td>
<td>400</td>
</tr>
</table>
<p>
<input type="button" onclick="padding('myTable')" value="Change padding">
</p>
</body>
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</html>