<ul id="menu" class="menu">
  <li class="menu-item">home</li>
  <li class="menu-item">about</li>
  <li class="menu-item">gallery</li>
  <li>blog</li>
</ul>
const listWithId = document.querySelector('#menu');
listWithId.style.textTransform = 'uppercase';
listWithId.style.fontSize = '24px';
console.log(listWithId);

const listWithClass = document.querySelector('.menu');
console.log(listWithClass);

const menuItemsByTagName = document.querySelectorAll("li");
console.log(menuItemsByTagName);

const menuItemsByClass = document.querySelectorAll(".menu-item");
console.log(menuItemsByClass);

const firstMenuItem = document.querySelector(".menu-item");
firstMenuItem.style.color = 'tomato';
console.log(firstMenuItem);

External CSS

  1. https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-beta/css/bootstrap.min.css

External JavaScript

This Pen doesn't use any external JavaScript resources.