HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Pointer lock events</title>
  <style>
    body { font-family: system-ui, sans-serif; margin: 1rem; }
    #canvas { width: 320px; height: 180px; background: #7c2d12; color: #fff; display: grid; place-items: center; border-radius: 8px; cursor: crosshair; }
  </style>
</head>
<body>
  <div id="canvas">Click to lock</div>
  <pre id="out">Pointer locked? false\n(Click canvas or press Esc)</pre>
  <script>
    const canvas = document.getElementById("canvas");
    const out = document.getElementById("out");
    function updateLockUI() {
      out.textContent = "Pointer locked? " + (document.pointerLockElement !== null);
    }
    canvas.addEventListener("click", () => {
      canvas.requestPointerLock().catch(console.error);
    });
    document.addEventListener("pointerlockchange", updateLockUI);
    document.addEventListener("pointerlockerror", () => {
      out.textContent = "Pointer lock request failed";
    });
  </script>
</body>
</html>

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pointerLockElement — lock events (Try It)