Frontend Developer Interview Questions For Freshers
  1. What is the difference between inline and block elements in HTML? Give examples.
  2. How do you include CSS styles in a webpage? Explain the different ways.
  3. What is the box model in CSS and how does it affect layout?
  4. What is the purpose of semantic HTML tags and give examples of such tags?
  5. Explain the difference between margin and padding in CSS.
  6. How do you create a responsive design using CSS?
  7. What is the role of JavaScript in front-end development?
  8. How do you add interactivity to a web page using JavaScript?
  9. Explain the concept of cross-site scripting (XSS) and how to prevent it.
  10. What is the Document Object Model (DOM) and how is it used in JavaScript?
  11. What is the difference between a variable and a constant in JavaScript?
  12. How do you handle errors in JavaScript?
  13. What is AJAX and how is it used in front-end development?
  14. Explain the concept of responsive images and how to implement them in HTML.
  15. What is the difference between a class and an ID in CSS?
  16. What is the purpose of the alt attribute in an image tag in HTML?
  17. Explain the difference between the float and position properties in CSS.
  18. How do you implement responsive typography in CSS?
  19. What are the different types of selectors in CSS?
  20. How do you implement form validation using JavaScript?
  21. Explain the difference between == and === in JavaScript.
  22. What is the purpose of the async and defer attributes in a script tag in HTML?
  23. How do you implement a dropdown menu in HTML and CSS?
  24. Explain the difference between let and var in JavaScript.
  25. What is the difference between a local and a global variable in JavaScript?
  26. How do you implement a toggle button using JavaScript?
  27. What are the different types of events in JavaScript?
  28. Explain the concept of event bubbling in JavaScript.
  29. How do you implement a sticky footer in CSS?
  30. What is the purpose of the tabindex attribute in HTML?
  31. What is the difference between the get and post methods in HTML forms?
  32. How do you implement responsive images using CSS?
  33. What is the purpose of the noscript tag in HTML?
  34. Explain the concept of progressive enhancement in front-end development.
  35. What is a web server and how does it work?
  36. What is the difference between HTTP and HTTPS?
  37. What is a domain name and how is it used in web development?
  38. What is the purpose of a DNS server in web development?
  39. How does a browser render a web page?
  40. What is a web application and how is it different from a website?
  41. What is the difference between client-side and server-side scripting?
  42. What is a web API and how is it used in web development?
  43. What is the purpose of a content management system (CMS) in web development?
  44. What are the different types of web hosting services?
Frontend Developer Intermediate Interview Questions
  1. What are the advantages and disadvantages of CSS preprocessors like SASS and LESS?
  2. Explain the concept of server-side rendering (SSR) and how it differs from client-side rendering.
  3. What are the best practices for optimizing website performance in front-end development?
  4. What is the purpose of a build system like Webpack and how does it work?
  5. Explain the concept of a single-page application (SPA) and how it is implemented using JavaScript frameworks like React and Vue.
  6. What is the difference between a synchronous and asynchronous operation in JavaScript?
  7. Explain the concept of closures in JavaScript and give an example of their use.
  8. How do you handle cross-browser compatibility issues in front-end development?
  9. What is the role of accessibility in front-end development and how do you ensure that a website is accessible?
  10. Explain the concept of state management in front-end development and give examples of state management libraries like Redux and MobX.
  11. What is the difference between a callback function and a promise in JavaScript?
  12. How do you implement a carousel using HTML, CSS, and JavaScript?
  13. Explain the difference between a margin and a padding collapse in CSS.
  14. What is the purpose of the role attribute in HTML?
  15. How do you implement a modal dialog box using HTML, CSS, and JavaScript?
  16. What are the best practices for implementing responsive design in front-end development?
  17. Explain the concept of event delegation in JavaScript.
  18. What is the purpose of the viewport meta tag in HTML?
  19. How do you implement lazy loading of images in HTML and JavaScript?
  20. What are the different types of animations that can be implemented using CSS?
  21. Explain the concept of polyfills in front-end development.
  22. How do you implement server-side rendering (SSR) using Node.js?
  23. What is the purpose of the rel attribute in HTML?
  24. Explain the difference between a function declaration and a function expression in JavaScript.
  25. How do you implement pagination using HTML, CSS, and JavaScript?
  26. What is the purpose of the crossorigin attribute in a script tag in HTML?
  27. Explain the difference between an SVG and a bitmap image.
  28. How do you implement a toggle switch using HTML, CSS, and JavaScript?
  29. What is the purpose of the aria attribute in HTML?
  30. Explain the concept of a CSS grid layout and how it is used in front-end development.
  31. What is a web framework and how is it used in web development?
  32. What is the difference between a web server and an application server?
  33. What is a web service and how is it different from a web API?
  34. What is a microservice architecture and how is it used in web development?
  35. What are the different types of databases used in web development?
  36. What is a web crawler and how is it used in web development?
  37. What is a load balancer and how is it used in web development?
  38. What is a caching server and how is it used in web development?
  39. What are the different types of web authentication mechanisms?
  40. What is a reverse proxy and how is it used in web development?
Frontend Developer Interview Questions For Experienced
  1. What is the difference between a component and a directive in Angular?
  2. Explain the concept of dependency injection in Angular and how it is used.
  3. How do you create animations in front-end development using CSS and JavaScript?
  4. What is the role of web workers in front-end development and how are they used?
  5. Explain the concept of serverless architecture and how it is used in front-end development.
  6. What is the difference between a promise and an observable in JavaScript?
  7. Explain the concept of lazy loading in Angular and how it is used to optimize website performance.
  8. What are the best practices for implementing security in front-end development?
  9. How do you create custom elements in front-end development using JavaScript and the web components API?
  10. Explain the concept of virtual DOM in JavaScript frameworks like React and how it is used to optimize website performance.
  11. What is the difference between a service and a factory in Angular?
  12. How do you handle concurrency in front-end development using JavaScript?
  13. What is the role of web sockets in front-end development and how are they used?
  14. Explain the concept of code splitting in front-end development and how it is used to optimize website performance.
  15. What are the best practices for implementing internationalization (i18n) in front-end development?
  16. How do you implement web animations using the Web Animations API?
  17. What is the purpose of the Picture-in-Picture (PiP) API in front-end development?
  18. Explain the concept of the Shadow DOM in web components.
  19. How do you implement server-side rendering (SSR) using React?
  20. What are the best practices for implementing cross-device compatibility in front-end development?
  21. Explain the concept of functional programming in JavaScript.
  22. What is the purpose of the Intersection Observer API in front-end development?
  23. How do you implement accessibility features in web applications using ARIA?
  24. Explain the concept of the Document Object Model (DOM) event system.
  25. How do you implement smooth scrolling using JavaScript?
  26. What are the different types of performance metrics that can be measured in web applications?
  27. Explain the concept of the Web Workers API and how it can be used to improve performance in web applications.
  28. What are the best practices for implementing offline functionality in web applications?
  29. How do you implement server-side rendering (SSR) using Vue.js?
  30. What is the purpose of the Performance API in front-end development?
  31. Explain the concept of the Accessibility Object Model (AOM) and how it can be used to improve accessibility in web applications.
  32. How do you implement real-time communication in web applications using WebRTC?
  33. What are the best practices for implementing security in web applications?
  34. Explain the concept of the CSS Object Model (CSSOM) and how it is used in front-end development.
  35. What is the purpose of a message broker in web development?
  36. What is the difference between horizontal and vertical scaling in web development?
  37. What is a distributed system and how is it used in web development?
  38. What is the purpose of a containerization platform like Docker in web development?
  39. What are the different types of content delivery networks (CDNs) and how are they used in web development?
  40. What is a web socket server and how is it used in web development?
  41. What is a web hook and how is it used in web development?
  42. What is a web assembly and how is it used in web development?
  43. What is the purpose of a service mesh in web development?
  44. What is a federated identity provider and how is it used in web development?