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<!DOCTYPE html>
<html>
<head>
<style>
div {
    border: 1px solid #FF0000;
}
</style>
</head>
<body>

<div id="myDiv">This is some text.</div>
<br>
<button type="button" onclick="changeMargin()">Change bottom margin of the div element</button>
<br>
<br>

<div id="myDiv2">This is some text.</div>
<br>
<button type="button" onclick="changePadding()">Change bottom padding of the div element</button>

<script>
function changeMargin() {
    document.getElementById("myDiv").style.marginBottom = "100px";
}

function changePadding() {
    document.getElementById("myDiv2").style.paddingBottom = "100px";
}
</script>

</body>
</html>