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Explanation

The DOM represents the HTML document as objects that JavaScript can access.

Code:

const heading = document.getElementById('title');

Explanation

getElementsByClassName() selects elements by class name.

Code:

const items = document.getElementsByClassName('item');

Explanation

querySelector() selects the first matching element.

Code:

const btn = document.querySelector('.btn');

Explanation

querySelectorAll() selects all matching elements.

Code:

const links = document.querySelectorAll('a');

Explanation

Selected elements can be modified using JavaScript.

Code:

heading.textContent = 'Welcome';