HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>clientY — scroll</title>
  <style>
    body { margin: 0; }
    .tall { height: 2000px; padding: 1rem; background: linear-gradient(#f0f0f0, #ddd); }
  </style>
</head>
<body>
  <p>Scroll down, then click near the top of the window.</p>
  <div class="tall">Tall content — scroll ↓ then click near viewport top</div>
  <pre id="out" style="position:fixed;bottom:1rem;left:1rem;background:#fff;padding:0.5rem;border:1px solid #888">Click…</pre>
  <script>
    document.addEventListener("click", function (e) {
      document.getElementById("out").textContent =
        "clientY: " + e.clientY +
        "\npageY: " + e.pageY +
        "\nscrollY: " + window.scrollY;
    });
  </script>
</body>
</html>

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MouseEvent.clientY — vs pageY after scroll (Try It)