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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>pointerlockerror listener</title>
  <style>
    #game { width: 320px; height: 140px; border: 2px solid #333; background: #eee; display: flex; align-items: center; justify-content: center; }
  </style>
</head>
<body>
  <p>Pointer lock target area:</p>
  <div id="game">Game surface</div>
  <pre id="out">(loading — requestPointerLock will run)</pre>
  <script>
    var game = document.getElementById("game");
    var out = document.getElementById("out");
    document.addEventListener("pointerlockerror", function (event) {
      out.textContent = "Error locking pointer\n" + event.type;
    });
    // Often fails without a user gesture — good for seeing pointerlockerror
    var maybe = game.requestPointerLock();
    if (maybe && typeof maybe.catch === "function") {
      maybe.catch(function () {
        out.textContent += "\nPromise rejected";
      });
    }
  </script>
</body>
</html>

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Document pointerlockerror — MDN listener (Try It)