<!DOCTYPE html>
<html>
<head>
<style>
body {
width: 5000px;
}
button {
position: fixed;
}
</style>
</head>
<body>
<p>Click the button to scroll the document window by 100px horizontally.</p>
<p>Look at the horizontal scrollbar to see the effect.</p>
<button onclick="scrollWin()">Click me to scroll horizontally!</button><br><br>
<script>
function scrollWin() {
window.scrollBy(100, 0);
}
</script>
</body>
</html>