HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>release on pointercancel</title>
  <style>
    #pad {
      width: 280px;
      height: 120px;
      background: #f0f9ff;
      border: 2px solid #38bdf8;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      touch-action: none;
      user-select: none;
      margin-bottom: 12px;
    }
  </style>
</head>
<body>
  <div id="pad">Pointer down here</div>
  <button type="button" id="cancelBtn">Simulate pointercancel</button>
  <pre id="out">—</pre>
  <script>
    var pad = document.getElementById("pad");
    var out = document.getElementById("out");
    var activeId = null;
    pad.addEventListener("pointerdown", function (ev) {
      pad.setPointerCapture(ev.pointerId);
      activeId = ev.pointerId;
      out.textContent = "capture set (id " + ev.pointerId + ")";
    });
    pad.addEventListener("pointercancel", function (ev) {
      if (pad.hasPointerCapture(ev.pointerId)) {
        pad.releasePointerCapture(ev.pointerId);
        out.textContent = "capture released on cancel";
      }
    });
    document.getElementById("cancelBtn").addEventListener("click", function () {
      if (activeId !== null) {
        pad.dispatchEvent(new PointerEvent("pointercancel", { pointerId: activeId, bubbles: true }));
        activeId = null;
      }
    });
  </script>
</body>
</html>

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Element.releasePointerCapture — pointercancel (Try It)