HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>pointer lock toggle</title>
  <style>
    #game { width: 320px; height: 180px; border: 2px solid #333; background: #1a1a2e; color: #fff; display: flex; align-items: center; justify-content: center; cursor: pointer; }
  </style>
</head>
<body>
  <canvas id="game" width="320" height="180"></canvas>
  <p>
    <button type="button" id="unlock" disabled>Exit pointer lock</button>
  </p>
  <pre id="status">Click canvas to lock</pre>
  <script>
    var canvas = document.getElementById("game");
    var status = document.getElementById("status");
    var unlockBtn = document.getElementById("unlock");
    var ctx = canvas.getContext("2d");
    ctx.fillStyle = "#1a1a2e";
    ctx.fillRect(0, 0, canvas.width, canvas.height);
    ctx.fillStyle = "#fff";
    ctx.fillText("Click to lock", 110, 95);
    function syncUi() {
      var locked = Boolean(document.pointerLockElement);
      status.textContent = locked ? "Pointer locked (Esc to exit)" : "Click canvas to lock";
      unlockBtn.disabled = !locked;
    }
    document.addEventListener("pointerlockchange", syncUi);
    canvas.addEventListener("click", function () {
      if (!document.pointerLockElement) {
        canvas.requestPointerLock();
      }
    });
    unlockBtn.addEventListener("click", function () {
      document.exitPointerLock();
    });
    syncUi();
  </script>
</body>
</html>

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Document pointerlockchange — toggle lock (Try It)