HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>drag with pageX</title>
  <style>
    body { font-family: sans-serif; padding: 16px; min-height: 120vh; }
    #box { position: absolute; left: 80px; top: 80px; width: 100px; height: 60px; background: #2563eb; color: #fff; border-radius: 8px; display: flex; align-items: center; justify-content: center; cursor: grab; user-select: none; }
    p.hint { font-size: 13px; color: #64748b; margin-top: 100px; }
  </style>
</head>
<body>
  <div id="box">Drag me</div>
  <p class="hint">Uses pageX delta — works when page is scrolled.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var startX, startLeft;
    $("#box").on("mousedown", function (event) {
      event.preventDefault();
      startX = event.pageX;
      startLeft = parseInt($("#box").css("left"), 10) || 0;
      $(document).on("mousemove.drag", onDrag).on("mouseup.drag", stopDrag);
    });
    function onDrag(event) {
      $("#box").css("left", startLeft + (event.pageX - startX));
    }
    function stopDrag() {
      $(document).off(".drag");
    }
  </script>
</body>
</html>

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jQuery event.pageX — horizontal drag (Try It)