HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>exitPointerLock basic</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} #stage{width:320px;height:160px;background:#1e293b;color:#fff;display:grid;place-items:center;border-radius:8px;cursor:crosshair;margin-bottom:0.75rem;} button{margin-right:0.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <div id="stage">Game area</div>
  <button id="lock" type="button">Lock</button>
  <button id="unlock" type="button">Unlock</button>
  <pre id="out">Ready (Esc also unlocks)</pre>
  <script>
    var stage = document.getElementById("stage");
    var out = document.getElementById("out");
    document.getElementById("lock").addEventListener("click", function () {
      if (!stage.requestPointerLock) {
        out.textContent = "requestPointerLock missing";
        return;
      }
      var result = stage.requestPointerLock();
      if (result && result.catch) {
        result.catch(function (err) {
          out.textContent = "lock failed: " + err.message;
        });
      }
    });
    document.getElementById("unlock").addEventListener("click", function () {
      if (document.pointerLockElement) {
        document.exitPointerLock();
        out.textContent = "exitPointerLock() called";
      } else {
        out.textContent = "not locked";
      }
    });
    document.addEventListener("pointerlockchange", function () {
      out.textContent = document.pointerLockElement
        ? "locked on " + document.pointerLockElement.id
        : "unlocked";
    });
  </script>
</body>
</html>

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Document.exitPointerLock — basic exit (Try It)