<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
body{
width:3000px;
height:3000px;
}
p{
margin-top:200px;
}
</style>
</head>
<body>
<p>Scroll the vertical scroll bar towards bottom or top at different position and click 'scrollY' button.</p>
<button onclick="myFunction()">scrollY</button>
<script>
window.scrollBy({
top: 100,
left: 0,
behavior: "auto"
});
function myFunction(){
alert("Scroll Top: "+window.scrollY);
}
</script> </body>
</html>