<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>JavaScript</title>
  <script>
    function showposition(event) {
      alert("Position: " + event.clientX + " / " + event.clientY);
    }
    window.addEventListener("click", showposition);
  </script>
</head>
<body>
  <section>
    <h1>Website</h1>
    <p>This is my website</p>
  </section>
</body>
</html>