Nov 28, 2016 · To add an additional class to an element: To add a class to an element, without removing/affecting existing values, append a space and the new classname, like so:

Add Class Step 1) Add HTML: Add a class name to the div element with id="myDIV" (in this example we use a button to add the class).

Jul 11, 2025 · Both .className and .classList.add () are effective ways to add classes to HTML elements using JavaScript. If you want to overwrite all existing classes, use .className. However, if …

Jul 25, 2025 · Explore effective JavaScript methods for dynamically adding and removing CSS classes from HTML elements, ensuring cross-browser compatibility and performance.

Mar 20, 2025 · This article explores methods for adding classes to elements, focusing on practical examples relevant to testing workflows. examples to demonstrate how to add classes to elements …

Read the tutorial and learn the two suggested methods of creating a JavaScript function that will add a class to the <div> element and solve your problem.

This tutorial shows you how to add one or more classes to an element in JavaScript

Nov 21, 2025 · Open your browser’s developer tools (F12 or Ctrl+Shift+I). Select the "Elements" tab and find your <div>. Look at the class attribute—you’ll see the new class appended (e.g., class="box …

I will show you three ways to add classes and clarify some benefits of each way. You can use any given method to add a class to your element, another way to check for, change or remove them.

Oct 12, 2025 · The classList.add() method adds the specified class to the element’s class list without removing existing classes. It automatically prevents duplicate classes and handles multiple class …