Use the left property to set the left position of a positioned element, such as a button.
Example
You can try to run the following code to set the left position of a positioned element with JavaScript −
<!DOCTYPE html>
<html>
<head>
<style>
#myID {
position: absolute;
}
</style>
</head>
<body>
<h1>Heading 1</h1>
<p>This is Demo Text.</p>
<button type="button" id="myID" onclick="display()">Change Left Position</button>
<script>
function display() {
document.getElementById("myID").style.left = "150px";
}
</script>
</body>
</html>