/* list of characters */
let count = 0;
document.querySelector('button').addEventListener('click', (ev) => {
    if (count < characters.length) {
    let item = document.createElement('li');
    item.innerText = characters[count];
    document.querySelector('ul').appendChild(item);

    item.scrollIntoView({behavior: 'smooth'});

    count = count + 1;
  }
  ev.preventDefault;
});