Q1. What is the class attribute in HTML?

The class attribute specifies one or more class names for an element, used for CSS styling and JavaScript manipulation.

Q2. How do you assign multiple classes to an element?

Separate class names with spaces: <div class="class1 class2 class3">Content</div>

Q3. What is the difference between class and id?

Classes can be reused on multiple elements, while ids must be unique per page. IDs have higher CSS specificity.

Q4. How do you select elements by class in CSS?

Use dot (.) followed by class name: .my-class { property: value; } selects all elements with that class.

Q5. Can you use classes with JavaScript?

Yes, JavaScript can access elements by class using methods like getElementsByClassName() or querySelectorAll().