<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
#outerDiv{
height:150px;
width:200px;
border:1px solid black;
overflow: auto;
}
#innerDiv{
height:1500px;
width:2000px;
}
</style>
</head>
<body>
<p>Click on the button to get the total width of the scrolling element.</p>
<button onclick="myFunction()">Click Me</button>
<p id="point"></p>
<div id="outerDiv">
<div id="innerDiv">Some content</div>
</div>
<p><strong>Note</strong>: scrollWidth = padding-left + padding-right + width = 0 + 0 + 2000 = 2000.</p>
<script>
var x = document.getElementById("point");
var elem = document.getElementById("innerDiv");
function myFunction(){
x.innerHTML = elem.scrollWidth;
}
</script> </body>
</html>