✅ Top 10 Web Development Interview Questions (2025) 🌐💻

1️⃣ Difference between ID and Class selectors in CSS?
⦁ ID is unique and used once per page (#id)
⦁ Class can be reused multiple times (.class)

2️⃣ What’s the difference between responsive and adaptive design?
⦁ Responsive: fluid layouts adjusting to screen size
⦁ Adaptive: predefined layouts for specific screen widths

3️⃣ Explain the box model in CSS.
⦁ Content + padding + border + margin — defines space and layout of elements

4️⃣ How do you vertically and horizontally center an element in CSS?
⦁ Using Flexbox:
display: flex;
justify-content: center;
align-items: center;


5️⃣ What is Cross-Origin Resource Sharing (CORS), and why is it important?
⦁ Security feature to allow or block resource requests between different domains.

6️⃣ Explain event delegation in JavaScript.
⦁ A technique to handle events at a parent element instead of multiple child elements.

7️⃣ How do you improve webpage load speed?
⦁ Minify CSS/JS, optimize images, lazy loading, use CDN, cache resources.

8️⃣ What is the difference between null and undefined in JavaScript?
⦁ null: explicit absence of value
⦁ undefined: variable declared but not assigned

9️⃣ Describe a RESTful API and its methods.
⦁ Stateless API using HTTP methods: GET, POST, PUT, DELETE for CRUD.

🔟 How would you ensure web accessibility?
⦁ Use semantic HTML, ARIA labels, keyboard navigation, color contrast, alt texts.

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