jQuery vs. Vanilla JS

Always consider if you really need jQuery. Everything used here works in IE9, Chrome, Firefox and on all major mobile browsers. Sadly, sometimes you end up using a JavaScript library that requires jQuery.

Document ready.

document.addEventListener('DOMContentLoaded', function () {
    console.log('Hello');
});

Selectors.

// First found element.
var lochNess = document.querySelector('.monsters');
console.log(lochNess.textContent);

// All found elements.
var monsters = document.querySelectorAll('.monsters');
for (var i = 0; i < monsters.length; i++) {
    console.log(monsters[i].innerHTML);
}

Listening to events.

btn[1].addEventListener('click', function () {
    list.removeEventListener('mouseover', enlarge);
});
btn[1].dispatchEvent('click');