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Solution Review: Add a Class

Explore how to add a class to a DOM element using JavaScript's querySelector and classList methods. Understand how selectors work, how to check element existence, and apply CSS classes dynamically to modify webpage appearance. This lesson prepares you to manipulate HTML elements through JS confidently.

We'll cover the following...

Solution #

Explanation #

Let’s start by discussing the addClass function. It takes two parameters, selector and className.

On line 2, we use document.querySelector and pass ...