Document: pointerlockchange event

The pointerlockchange event is fired when the pointer is locked/unlocked.

Using addEventListener():

document.addEventListener('pointerlockchange', (event) => {
  console.log('Pointer lock changed');
});

Using the onpointerlockchange event handler property:

document.onpointerlockchange = (event) => {
  console.log('Pointer lock changed');
};

• Using Pointer Lock API