HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hasPointerCapture drag</title>
  <style>
    #handle {
      width: 120px;
      height: 120px;
      background: #4a90d9;
      color: #fff;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      touch-action: none;
      user-select: none;
      cursor: grab;
    }
  </style>
</head>
<body>
  <div id="handle">Drag me</div>
  <pre id="out">Pointer down to start</pre>
  <script>
    var handle = document.getElementById("handle");
    var out = document.getElementById("out");
    handle.addEventListener("pointerdown", function (ev) {
      handle.setPointerCapture(ev.pointerId);
      out.textContent = "capture on — move pointer";
    });
    handle.addEventListener("pointermove", function (ev) {
      if (!handle.hasPointerCapture(ev.pointerId)) return;
      out.textContent = "dragging at " + ev.clientX + ", " + ev.clientY;
    });
    handle.addEventListener("pointerup", function () {
      out.textContent += "\nreleased";
    });
  </script>
</body>
</html>

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Element.hasPointerCapture — drag guard (Try It)