HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>requestPointerLock canvas</title>
  <style>
    #canvas { width: 320px; height: 200px; background: #1e293b; color: #fff; display: grid; place-items: center; border-radius: 8px; cursor: crosshair; }
    body { font-family: sans-serif; }
  </style>
</head>
<body>
  <div id="canvas">Click to lock pointer</div>
  <p id="status">Status: unlocked</p>
  <script>
    var canvas = document.getElementById("canvas");
    var status = document.getElementById("status");
    canvas.addEventListener("click", function () {
      canvas.requestPointerLock().then(function () {
        status.textContent = "Status: locked (press Esc to exit)";
      }).catch(function (err) {
        status.textContent = "Error: " + err.message;
      });
    });
    document.addEventListener("pointerlockchange", function () {
      if (!document.pointerLockElement) {
        status.textContent = "Status: unlocked";
      }
    });
  </script>
</body>
</html>

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Element.requestPointerLock — canvas click (Try It)