<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("div").mousedown(function(event){
$("div").append("<br>Mouse button pressed: " + event.which);
});
});
</script>
</head>
<body>
<div style="border:1px solid black;width:400px;height:400px;">Press down any mouse buttons inside this div element.</div>
</body>
</html>