Modern Web Design with HTML5, CSS3, and JavaScript - Manipulating Page Elements - JavaScript and Classes

The video tutorial covers how to manipulate HTML element classes using JavaScript. It explains how to select elements, add, remove, toggle, and replace classes using the class list method. The tutorial also demonstrates conditional class application based on element index and how to check for class presence using boolean values. Additionally, it shows how to add and remove multiple classes simultaneously.

What is the first step in applying a class to an HTML element using JavaScript?

• Create a new class in CSS

• Select the element using querySelector

• Add a new style tag

• Log the element to the console

What happens when you toggle a class on an element that already has it?

• The class is removed

• The class is duplicated

• A new class is added

• The class remains unchanged

How can you replace a class on multiple elements using JavaScript?

• Use querySelector to select each element

• Use classList.replace method

• Use a for loop to iterate over elements

• Use a CSS rule to change the class

What is the result of using classList.toggle on an element with a condition based on its index?

• All elements are toggled

• The first element is always toggled

• No elements are toggled

• Only elements with a specific index are toggled

How can you check if an element contains a specific class using JavaScript?

• Use classList.contains method

• Use querySelector to find the class

• Use a CSS selector

• Use classList.add method

What is the advantage of using classList to manipulate classes?

• It allows for inline styling

• It is faster than CSS

• It provides methods to add, remove, and toggle classes efficiently

• It automatically updates the HTML

Which method allows you to add multiple classes to an element at once?

• classList.contains

• classList.replace

• classList.toggle

• classList.add