// Make a list
const ul = document.createElement('ul');
document.body.appendChild(ul);

const li1 = document.createElement('li');
const li2 = document.createElement('li');
ul.appendChild(li1);
ul.appendChild(li2);

function hide(evt) {
  // e.target refers to the clicked 
 element
  // This is different than e.currentTarget, which would refer to the parent 
 in this context
  evt.target.style.visibility = 'hidden';
}

// Attach the listener to the list
// It will fire when each 
 is clicked
ul.addEventListener('click', hide, false);