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// Using Document.querySelectorAll() method
const elements = document.querySelectorAll('.className');
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const allElementContainGrepperClassName = document.querySelectorAll('.grepper');
// => return array of all elements
const firstElementContainGrepperClassName = document.querySelector('.grepper');
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let divs = document.querySelectorAll('.className');
OR
let divs = document.getElementsByClassName('className');