HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>clientX — pageX</title>
</head>
<body>
  <p>Click anywhere.</p>
  <pre id="out">Waiting…</pre>
  <script>
    document.addEventListener("click", function (e) {
      document.getElementById("out").textContent = JSON.stringify({
        clientX: e.clientX,
        pageX: e.pageX,
        scrollX: window.scrollX
      }, null, 2);
    });
  </script>
</body>
</html>

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MouseEvent.clientX — vs pageX (Try It)