HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>scroll position</title>
  <style>body { min-height: 150vh; }</style>
</head>
<body>
  <p>Scroll the page, then click Read.</p>
  <button type="button" id="read">Read scrollTop</button>
  <pre id="out"></pre>
  <script>
    document.getElementById("read").addEventListener("click", function () {
      var y = document.scrollingElement.scrollTop;
      document.getElementById("out").textContent =
        "Vertical scroll: " + y + " px";
    });
  </script>
</body>
</html>

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scrollingElement — read scrollTop (Try It)