HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Pointer lock MDN UI</title>
  <style>
    body { font-family: system-ui, sans-serif; margin: 1rem; }
    #container { width: 320px; height: 180px; background: #1e293b; color: #fff; display: grid; place-items: center; border-radius: 8px; cursor: crosshair; }
  </style>
</head>
<body>
  <div id="container">Click Lock, then click here</div>
  <p><button type="button" id="lock">Lock pointer</button></p>
  <pre id="out">Lock button enabled</pre>
  <script>
    const lockButton = document.getElementById("lock");
    const container = document.getElementById("container");
    lockButton.addEventListener("click", () => {
      container.requestPointerLock().catch(err => alert(err.message));
    });
    document.addEventListener("pointerlockchange", () => {
      const locked = document.pointerLockElement === container;
      lockButton.disabled = locked;
      document.getElementById("out").textContent = locked
        ? "Locked — Lock button disabled (press Esc to exit)"
        : "Unlocked — Lock button enabled";
    });
  </script>
</body>
</html>

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pointerLockElement — MDN button sync (Try It)