HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>releaseCapture cancel</title>
  <style>body{font-family:system-ui,sans-serif;margin:1rem;}button{margin-right:0.5rem;padding:0.4rem 0.75rem;}</style>
</head>
<body>
  <button type="button" id="start">Start capture</button>
  <button type="button" id="cancel">Cancel / release</button>
  <pre id="out">ready</pre>
  <script>
    var out = document.getElementById("out");
    var pad = document.body;
    document.getElementById("start").addEventListener("click", function () {
      if (typeof pad.setCapture === "function") {
        pad.setCapture();
        out.textContent = "capture started (if supported)";
      } else {
        out.textContent = "setCapture unsupported";
      }
    });
    document.getElementById("cancel").addEventListener("click", function () {
      if (typeof document.releaseCapture === "function") {
        document.releaseCapture();
        out.textContent = "released";
      } else {
        out.textContent = "releaseCapture unsupported";
      }
    });
  </script>
</body>
</html>

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Document.releaseCapture — cancel mid-drag (Try It)