HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>release on pointerup</title>
  <style>
    #box {
      width: 260px;
      height: 100px;
      border: 2px dashed #555;
      display: flex;
      align-items: center;
      justify-content: center;
      touch-action: none;
      user-select: none;
    }
  </style>
</head>
<body>
  <div id="box">Press and release</div>
  <pre id="out">—</pre>
  <script>
    var box = document.getElementById("box");
    var out = document.getElementById("out");
    var lines = [];
    box.addEventListener("pointerdown", function (ev) {
      box.setPointerCapture(ev.pointerId);
      lines.push("drag started");
      out.textContent = lines.join("\n");
    });
    box.addEventListener("pointerup", function (ev) {
      box.releasePointerCapture(ev.pointerId);
      lines.push("drag ended — capture released");
      out.textContent = lines.join("\n");
    });
  </script>
</body>
</html>

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Element.releasePointerCapture — pointerup (Try It)