document.querySelector()

Find the first matching element on a page. If an element isn’t found, querySelector() returns null.

// The first button
let button = document.querySelector('button');

// The first element with the .bg-red class
let red = document.querySelector('.bg-red');

// The first element with a data attribute of snack equal to carrots
let carrots = document.querySelector('[data-snack="carrots"]');