HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>pointer lock movement</title>
  <style>
    #game { width: 320px; height: 180px; border: 2px solid #333; background: #222; color: #fff; display: flex; align-items: center; justify-content: center; cursor: pointer; }
  </style>
</head>
<body>
  <div id="game">Click to lock, then move mouse</div>
  <pre id="out">Unlocked — click canvas to lock</pre>
  <script>
    var canvas = document.getElementById("game");
    var out = document.getElementById("out");
    var yaw = 0;
    var pitch = 0;
    document.addEventListener("pointerlockchange", function () {
      out.textContent = document.pointerLockElement
        ? "Locked — move the mouse"
        : "Unlocked — click canvas to lock";
    });
    canvas.addEventListener("click", function () {
      canvas.requestPointerLock();
    });
    document.addEventListener("mousemove", function (event) {
      if (!document.pointerLockElement) return;
      yaw += event.movementX;
      pitch += event.movementY;
      out.textContent = "yaw: " + yaw + ", pitch: " + pitch;
    });
  </script>
</body>
</html>

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Document pointerlockchange — movement deltas (Try It)