The correct method to add a class to an HTML element in JavaScript is `element.classList.add()`.

Here's a step-by-step guide on how to use it:

1. First, you need to select the HTML element. You can do this using various methods like `getElementById()`, `getElementsByClassName()`, `getElementsByTagName()`, or `querySelector()`. For example:
```javascript
let element = document.getElementById('myElement');
```
2. Once you have the element, you can add a class to it using `classList.add()`. You just need to pass the class name as a string argument to this method. For example:
```javascript
element.classList.add('myClass');
```
3. Now, the HTML element with the id 'myElement' will also have the class 'myClass'. You can check this by inspecting the element in the browser's developer tools.

The other methods mentioned in the question (`element.addClassName()`, `element.addClass()`, `addClass()`) are not standard JavaScript methods for adding a class to an HTML element.

Question

The correct method to add a class to an HTML element in JavaScript is `element.classList.add()`.

Here's a step-by-step guide on how to use it:

1. First, you need to select the HTML element. You can do this using various methods like `getElementById()`, `getElementsByClassName()`, `getElementsByTagName()`, or `querySelector()`. For example:
```javascript
let element = document.getElementById('myElement');
```
2. Once you have the element, you can add a class to it using `classList.add()`. You just need to pass the class name as a string argument to this method. For example:
```javascript
element.classList.add('myClass');
```
3. Now, the HTML element with the id 'myElement' will also have the class 'myClass'. You can check this by inspecting the element in the browser's developer tools.

The other methods mentioned in the question (`element.addClassName()`, `element.addClass()`, `addClass()`) are not standard JavaScript methods for adding a class to an HTML element.

Knowee AI · Accepted Answer

The correct method to add a class to an HTML element in JavaScript is `element.classList.add()`.

Here's a step-by-step guide on how to use it:

1. First, you need to select the HTML element. You can do this using various methods like `getElementById()`, `getElementsByClassName()`, `getElementsByTagName()`, or `querySelector()`. For example:
```javascript
let element = document.getElementById('myElement');
```
2. Once you have the element, you can add a class to it using `classList.add()`. You just need to pass the class name as a string argument to this method. For example:
```javascript
element.classList.add('myClass');
```
3. Now, the HTML element with the id 'myElement' will also have the class 'myClass'. You can check this by inspecting the element in the browser's developer tools.

The other methods mentioned in the question (`element.addClassName()`, `element.addClass()`, `addClass()`) are not standard JavaScript methods for adding a class to an HTML element.

Which of the following methods can be used to add a class to an HTML element in JavaScript?Optionselement.addClassName()element.addClass()addClass()element.classList.add()

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