Preparing for a frontend developer job in 2025? This guide covers everything you need, including the most important Frontend Developer Interview Questions, coding challenges, and real-world examples. Whether you’re a fresher or have some experience, Techy Notes helps you improve your skills, boost confidence, and get ready to ace your next interview.

1. What is HTML and why is it important?

HTML (HyperText Markup Language) is the backbone of web pages. It structures the content, making it possible for browsers to display text, images, and videos properly.

2. Difference between block-level and inline elements

Block-level elements (like <div>, <p>) start on a new line and take the full width. Inline elements (like <span>, <a>) stay in line with other content.

3. What are semantic HTML elements?

Semantic elements like <header>, <article>, and <footer> describe their purpose, improving SEO and accessibility.

4. How do you make a website responsive?

By using CSS media queries, fluid layouts, and flexible images to adapt the website to different screen sizes.

5. Explain the difference between relative, absolute, fixed, and sticky positioning

Relative: Position relative to its normal location.

Absolute: Position relative to the nearest positioned ancestor.

Fixed: Position relative to the viewport.

Sticky: Switches between relative and fixed based on scroll.

6. What is the difference between id and class in CSS?

id: Unique identifier for one element.

class: Can be used for multiple elements.

7. What is the DOM?

The Document Object Model is a programming interface that represents HTML as objects, allowing JavaScript to manipulate it dynamically.

8. How does CSS specificity work?

Specificity determines which CSS rule is applied. Inline >

9. Explain the difference between == and === in JavaScript

==: Compares values after type conversion.

===: Compares both value and type (strict equality).

10. What is event bubbling and capturing?

Bubbling: Event starts from the target element and moves up.

Capturing: Event starts from the root and goes down to the target.

11. How do you optimize website performance?

Minify CSS/JS, compress images, use lazy loading, and leverage browser caching.

12. Difference between var, let, and const

var: Function-scoped, can be redeclared.

let: Block-scoped, cannot be redeclared in the same scope.

const: Block-scoped, cannot be redeclared or reassigned.

13. What are CSS Flexbox and Grid?

Flexbox: One-dimensional layout for aligning items in a row or column.

Grid: Two-dimensional layout for rows and columns.

14. What is responsive vs adaptive design?

Responsive: Layout adjusts fluidly to any screen.

Adaptive: Predefined layouts for specific screen sizes.

15. How does JavaScript handle asynchronous code?

Through callbacks, promises, and async/await to execute non-blocking operations.

16. What is Cross-Origin Resource Sharing (CORS)?

A browser mechanism that controls access to resources between different domains.

17. How do you debug frontend code?

Use browser DevTools, console logs, breakpoints, and inspect elements.

18. What are web accessibility best practices?

Use semantic HTML, ARIA roles, alt text for images, and proper color contrast.

19. What is version control and why is Git popular?

Version control tracks code changes. Git is popular because it’s fast, distributed, and widely supported.

20. How do you handle browser compatibility issues?

Use vendor prefixes, feature detection, and tools like Autoprefixer or Babel.

Learn More with Techy Notes

At Techy Notes, we provide beginner-friendly guides, coding tips, and curated Frontend Developer Interview Questions to help you crack your first job interview. From HTML basics to advanced JavaScript, we simplify learning with practical examples.

FAQs – Frontend Developer Interview Questions

Q1. What are the top skills needed for a frontend developer in 2025?
HTML, CSS, JavaScript, responsive design, and basic knowledge of frameworks like React or Vue.

Q2. Are these Frontend Developer Interview Questions enough for freshers?
Yes, these cover the basics, but you should also practice coding challenges and build small projects.

Q3. Can I learn frontend development in 3 months?
Yes, with consistent practice and focused learning, you can build a strong foundation in 3 months.

Q4. Why should I follow Techy Notes for preparation?
Because Techy Notes provides clear, practical, and up-to-date guides tailored for freshers and beginners.