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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("button").on("click",function(){ 
    var version = $().jquery; 
    alert("You are running jQuery version: " + version); 
  });
}); 
</script>
</head>
<body>
<button>Click me!</button>
</body>
</html>