HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>scroll progress</title>
  <style>
    body { font-family: sans-serif; margin: 0; padding-top: 8px; }
    #bar-wrap { position: fixed; top: 0; left: 0; right: 0; height: 6px; background: #e2e8f0; z-index: 10; }
    #bar { height: 100%; width: 0; background: #2563eb; transition: width 0.05s; }
    .content { padding: 24px 16px 120vh; max-width: 520px; line-height: 1.7; }
    #pct { position: fixed; bottom: 12px; right: 12px; background: #1e293b; color: #fff; padding: 6px 12px; border-radius: 6px; font-size: 13px; font-weight: 600; }
  </style>
</head>
<body>
  <div id="bar-wrap"><div id="bar"></div></div>
  <div class="content">
    <h2>Scroll progress demo</h2>
    <p>Scroll down to fill the top bar. The handler reads $(window).scrollTop() and document height.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Scroll events fire whenever scroll position changes — wheel, scrollbar, keyboard, or touch.</p>
  </div>
  <div id="pct">0%</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    function updateProgress() {
      var st = $(window).scrollTop();
      var max = $(document).height() - $(window).height();
      var pct = max > 0 ? Math.round((st / max) * 100) : 0;
      $("#bar").css("width", pct + "%");
      $("#pct").text(pct + "%");
    }
    $(window).on("scroll", updateProgress);
    updateProgress();
  </script>
</body>
</html>

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jQuery scroll event — scrollTop progress bar (Try It)