Callback parameters (event)

document.addEventListener('click', actionClick );
function actionClick(event) {
  const button = event.button;
  const x = event.clientX;
  const y = event.clientY;
  const newElement = document.createElement('p');
  newElement.textContent = `Click ${button} at position (${x},${y})`;
  document.querySelector("body").appendChild(newElement);
}