HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>exitPointerLock error</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} #stage{width:320px;height:140px;background:#1e293b;color:#fff;display:grid;place-items:center;border-radius:8px;margin-bottom:0.75rem;} button{margin-right:0.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <div id="stage">Stage</div>
  <button id="lock" type="button">Try lock</button>
  <button id="unlock" type="button">Exit lock</button>
  <pre id="out">Listening for pointerlockchange / pointerlockerror</pre>
  <script>
    var stage = document.getElementById("stage");
    var out = document.getElementById("out");
    document.addEventListener("pointerlockerror", function () {
      out.textContent = "pointerlockerror fired";
    });
    document.addEventListener("pointerlockchange", function () {
      out.textContent = document.pointerLockElement
        ? "locked"
        : "unlocked (or lock ended)";
    });
    document.getElementById("lock").addEventListener("click", function () {
      stage.requestPointerLock();
    });
    document.getElementById("unlock").addEventListener("click", function () {
      if (document.pointerLockElement) {
        document.exitPointerLock();
      } else {
        out.textContent = "nothing to exit";
      }
    });
  </script>
</body>
</html>

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Document.exitPointerLock — pointerlockerror (Try It)