what kind of target in js code example

Example 1: javascript .target

// 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 <li> element
  // This is different than e.currentTarget, which would refer to the parent <ul> in this context
  evt.target.style.visibility = 'hidden';
}

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

Example 2: what is e.target in javascript

The target property gets the element on which the event originally occurred, 
opposed to the currentTarget property, which always refers to the element 
whose event listener triggered the event.