Web Development interview questions 🚀

1. Difference between ID and Class selectors in CSS?
2. Difference between undefined and null in JavaScript?
3. Differences between HTML and XHTML?
4. Responsive design vs Adaptive design — explain.
5. What is progressive rendering in HTML?
6. Difference between span and div tags?
7. How do quirks mode, full standards mode, and almost standards mode differ?
8. Differences between ES5 and ES6 JavaScript?
9. How do you organize your assets and JavaScript code?
10. How do you explain APIs to non-technical stakeholders?
11. Black box vs White box testing — what’s the difference?
12. Biggest trends in web development?
13. Differences between mobile and desktop web development?
14. What is push technology and its pros/cons?
15. How to implement integer division if not available?
16. How to vertically and horizontally center an element with CSS?
17. How to improve page load speed?
18. What’s the Virtual DOM in React?
19. Explain SSR, CSR, and SSG rendering methods.
20. What is tree shaking in JavaScript bundlers?
21. What’s responsive design?
22. What are Web Components and why use them?
23. What is hydration in Next.js and similar frameworks?
24. How do you handle SEO, UX, performance, and security in web apps?
25. Describe your typical workflow for building web pages.
26. How do you debug and test others’ code?
27. How do you ensure web accessibility?
28. REST vs SOAP — what’s the difference?
29. How do you troubleshoot slow loading pages?
30. What strategies do you use to meet deadlines under pressure?
31. How do you make a website mobile-friendly?
32. Explain Agile development workflows you've worked with.
33. What tools and libraries do you use?
34. How do you prioritize features and bug fixes?
35. What is the difference between clustered and non-clustered indexes in databases?
36. How do you manage CSS with many style sheets?
37. Can you explain cross-site scripting (XSS) and how to prevent it?
38. What are some common security best practices in web development?
39. How do you optimize SQL queries for performance?
40. What is RESTful API design and best practices?

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