HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>movementY — pan</title>
  <style>
    #box {
      width: 80px; height: 80px; background: #2563eb; color: #fff;
      display: grid; place-items: center; cursor: grab; user-select: none;
      transform: translateY(40px);
    }
  </style>
</head>
<body>
  <p>Click and drag the box vertically.</p>
  <div id="box">Drag</div>
  <script>
    var box = document.getElementById("box");
    var dragging = false;
    var y = 40;
    box.addEventListener("mousedown", function () { dragging = true; });
    window.addEventListener("mouseup", function () { dragging = false; });
    window.addEventListener("mousemove", function (e) {
      if (!dragging) return;
      y += e.movementY;
      box.style.transform = "translateY(" + y + "px)";
    });
  </script>
</body>
</html>

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MouseEvent.movementY — simple pan (Try It)