Web Development

Sure! Here’s the revised content with ** replacing *: --- 🚀 Web Development Interview Questions with Answers — Part 2: CSS 🧠 21. What is CSS? CSS stands for Cascading Style Sheets. It is used to style and design HTML elements. CSS helps to: • Add colors • Set fonts • Create layouts • Add animations • Make websites responsive Example:

h1 {
   color: blue;
   font-size: 40px;
}

🧠 22. Difference Between Inline, Internal, and External CSS Type : Description Inline CSS : Written inside HTML element Internal CSS : Written inside <style> tag External CSS : Written in separate .css file Inline CSS:

<h1 style="color:red;">Hello</h1>

Internal CSS:

<style>
h1 {
   color: blue;
}
</style>

External CSS:

<link rel="stylesheet" href="style.css">

🧠 23. What is Specificity in CSS? Specificity determines which CSS rule is applied when multiple rules target the same element. Priority Order: 1. Inline CSS 2. ID Selector 3. Class Selector 4. Element Selector Example:

#title {
   color: red;
}

.heading {
   color: blue;
}

ID selector has higher priority. 🧠 24. Explain CSS Box Model Every HTML element is treated as a box. The box model contains: • Content • Padding • Border • Margin Structure:

Margin
 └ Border
    └ Padding
       └ Content

Example:

div {
   padding: 20px;
   border: 2px solid black;
   margin: 10px;
}

🧠 25. Difference Between Margin and Padding Margin : Space outside border Creates gap between elements Padding : Space inside border Creates inner spacing Example:

div {
   margin: 20px;
   padding: 20px;
}

🧠 26. What is Flexbox? Flexbox is a one-dimensional layout system used for alignment and spacing. Benefits: ✅ Easy alignment ✅ Responsive layouts ✅ Flexible spacing Example:

.container {
   display: flex;
   justify-content: center;
   align-items: center;
}

🧠 27. What is CSS Grid? CSS Grid is a two-dimensional layout system. It handles: • Rows • Columns Example:

.container {
   display: grid;
   grid-template-columns: 1fr 1fr;
}

🧠 28. Difference Between Relative, Absolute, Fixed, and Sticky Positioning Position : Description relative : Positioned relative to itself absolute : Positioned relative to parent fixed : Fixed on screen sticky : Sticks during scrolling Example:

div {
   position: absolute;
   top: 20px;
}

🧠 29. What is z-index? z-index controls stack order of elements. Higher z-index appears on top. Example:

.box {
   z-index: 10;
}

🧠 30. Difference Between em, rem, %, px, vh, and vw Unit : Meaning px : Fixed pixels % : Relative percentage em : Relative to parent rem : Relative to root vh : Viewport height vw : Viewport width Example:

h1 {
   font-size: 2rem;
}

🧠 31. What are Pseudo-Classes? Pseudo-classes define special states of elements. Examples:

a:hover {
   color: red;
}

Common Pseudo-Classes: • :hover • :focus • :first-child • :last-child 🧠 32. What are Pseudo-Elements? Pseudo-elements style specific parts of elements. Example:

p::first-letter {
   font-size: 40px;
}

Common Pseudo-Elements: • ::before • ::after • ::first-letter 🧠 33. Difference Between visibility:hidden and display:none visibility:hidden : Element hidden but space remains display:none : Element removed completely Example:

.box {
   display: none;
}

🧠 34. What is Media Query? Media queries make websites responsive. Example:

@media (max-width: 768px) {
   body {
      background: lightblue;
   }
}

🧠 35. Explain Responsive Design Responsive design ensures websites work on: • Mobile • Tablet • Desktop Techniques: ✅ Media Queries ✅ Flexible layouts

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Example: document.cookie = "username=Deepak"; 🧠 15. What are Void Elements? Void elements do not require closing tags. Examples: - <br> - <hr> - <img> - <input> 🧠 16. What is the Purpose of alt Attribute? alt provides alternative text for images. Example: <img src="cat.jpg" alt="Cute Cat"> Benefits: ✅ Accessibility ✅ SEO ✅ Backup text if image fails 🧠 17. Explain Audio and Video Tags HTML5 provides multimedia support. Audio Example: <audio controls> <source src="song.mp3"> </audio> Video Example: <video controls width="400"> <source src="movie.mp4"> </video> 🧠 18. What is Accessibility in HTML? Accessibility means making websites usable for everyone. Best Practices: - Semantic HTML - Alt text - Proper headings - Keyboard support 🧠 19. What are ARIA Attributes? ARIA improves accessibility for screen readers. Example: <button aria-label="Search"> Common ARIA Attributes: - aria-label - aria-hidden - aria-expanded 🧠 20. Difference Between <strong> and <b> <strong> : Semantic importance <b> : Only bold styling <strong> : Used for important text <b> : Used for design Example: <strong>Important</strong> <b>Bold Text</b> Double Tap ❤️ For Part-2

🚀 Web Development Interview Questions with Answers — Part 1: HTML 🧠 1. What is HTML? HTML stands for HyperText Markup Language. It is the standard language used to create and structure web pages. HTML is used to: • Create headings • Add paragraphs • Insert images • Create links • Build forms • Structure web content Example:

<!DOCTYPE html>
<html>
<head>
   <title>My Website</title>
</head>
<body>
   <h1>Hello World</h1>
</body>
</html>

🧠 2. Difference Between HTML4 and HTML5 HTML4 : Older version HTML5 : Latest version HTML4 : No semantic tags HTML5 : Semantic tags added HTML4 : No direct multimedia support HTML5 : Supports audio/video HTML4 : Less mobile friendly HTML5 : Mobile optimized HTML5 Features: • <video> • <audio> • <canvas> • Local Storage • Semantic Tags 🧠 3. What are Semantic Tags in HTML5? Semantic tags describe the meaning of content clearly. Common Semantic Tags: • <header> • <nav> • <section> • <article> • <footer> Benefits: ✅ Better SEO ✅ Better readability ✅ Accessibility improvement Example:

<article>
   <h2>Blog Title</h2>
   <p>Content here...</p>
</article>

🧠 4. Difference Between <div> and <span> <div> : Block element <span> : Inline element <div> : Takes full width <span> : Takes required width <div> : Used for sections <span> : Used for small styling Example:

<div>Hello</div>
<span>Hello</span>

🧠 5. What is the Purpose of DOCTYPE? <!DOCTYPE html> tells the browser which HTML version is being used. Example:

<!DOCTYPE html>

Benefits: ✅ Proper rendering ✅ Avoids browser compatibility issues 🧠 6. What are Meta Tags? Meta tags provide information about the webpage. Example:

<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="HTML Tutorial">

Uses: • SEO • Responsive design • Character encoding 🧠 7. Difference Between ID and Class ID : Unique Class : Reusable ID : Uses # in CSS Class : Uses . in CSS Example:

<div id="header"></div>
<div class="card"></div>
<div class="card"></div>

🧠 8. What are Inline and Block Elements? Block Elements Start on new line Take full width Examples: • <div> • <p> • <h1> Inline Elements Do not start on new line Take only required space Examples: • <span> • <a> • <img> 🧠 9. Explain Forms in HTML Forms collect user input. Example:

<form>
   <input type="text" placeholder="Enter Name">
   <input type="email" placeholder="Enter Email">
   <button>Submit</button>
</form>

Common Form Elements: • input • textarea • select • checkbox • radio button 🧠 10. Difference Between GET and POST GET : Data visible in URL POST : Data hidden GET : Less secure POST : More secure GET : Used for fetching POST : Used for sending Example:

<form method="GET"></form>
<form method="POST"></form>

🧠 11. What is localStorage and sessionStorage? Both store data in browser. localStorage : Permanent sessionStorage : Temporary localStorage : Remains after closing browser sessionStorage : Removed after tab closes Example:

localStorage.setItem("name", "Deepak");
sessionStorage.setItem("theme", "dark");

🧠 12. What are Data Attributes? Custom attributes used to store extra information. Example:

<div data-userid="101">User</div>

Access in JavaScript:

element.dataset.userid

🧠 13. What is iframe? iframe embeds another webpage inside a webpage. Example:

<iframe src="https://example.com"></iframe>

Uses: • YouTube videos • Google Maps • External websites 🧠 14. Difference Between Cookies and localStorage Cookies : Small storage localStorage : Large storage Cookies : Sent to server

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🌐 5. Node.js Interview Questions (111–130) 111. What is Node.js? 112. Why use Node.js? 113. What is npm? 114. Difference between CommonJS and ES Modules 115. What is Express.js? 116. What is middleware? 117. What is REST API? 118. Difference between PUT and PATCH 119. What is JWT? 120. What is authentication vs authorization? 121. What is CORS? 122. What is dotenv? 123. What is event loop? 124. What is non-blocking I/O? 125. What is package.json? 126. What is nodemon? 127. What are streams in Node.js? 128. What is buffering? 129. What is async middleware? 130. What is rate limiting? 🗄️ 6. Database Interview Questions (131–150) 131. What is SQL? 132. Difference between SQL and NoSQL 133. What is primary key? 134. What is foreign key? 135. What is normalization? 136. What are joins in SQL? 137. Difference between INNER JOIN and LEFT JOIN 138. What is indexing? 139. What is aggregate function? 140. Difference between DELETE, DROP, and TRUNCATE 141. What is MongoDB? 142. Difference between MongoDB and MySQL 143. What is schema? 144. What is ORM? 145. What is Sequelize? 146. What is Mongoose? 147. What is ACID property? 148. What is transaction? 149. What is database sharding? 150. What is replication? 🔒 7. Web Security Interview Questions (151–165) 151. What is HTTPS? 152. Difference between HTTP and HTTPS 153. What is SSL/TLS? 154. What is XSS attack? 155. What is CSRF attack? 156. What is SQL Injection? 157. How to secure APIs? 158. What is hashing? 159. Difference between encryption and hashing 160. What is bcrypt? 161. What is OAuth? 162. What is JWT token security? 163. What is Content Security Policy? 164. What is brute force attack? 165. What is two-factor authentication? 🚀 8. APIs & Backend Concepts (166–180) 166. What is API? 167. Difference between REST and GraphQL 168. What is RESTful API? 169. What are HTTP status codes? 170. Explain 200, 201, 400, 401, 403, 404, 500 171. What is API testing? 172. What is Postman? 173. What is WebSocket? 174. Difference between polling and WebSocket 175. What is microservice architecture? 176. What is monolithic architecture? 177. What is caching? 178. What is Redis? 179. What is CDN? 180. What is load balancing? ☁️ 9. Deployment & DevOps Questions (181–190) 181. What is Git? 182. Difference between Git and GitHub 183. What is version control? 184. What is branching in Git? 185. What is merge conflict? 186. What is CI/CD? 187. What is Docker? 188. What is Kubernetes? 189. What is cloud hosting? 190. Difference between AWS, Azure, and GCP 🧩 10. Advanced Web Development Questions (191–200) 191. What is Progressive Web App (PWA)? 192. What is service worker? 193. What is lazy loading? 194. What is code splitting? 195. What is tree shaking? 196. What is SSR in Next.js? 197. What is hydration in React? 198. What is Webpack? 199. What is Babel? 200. What is TypeScript and why use it? 🔥 Double Tap ❤️ For Detailed Answers

🚀 Top 200 Web Development Interview Questions 🧠 1. HTML Interview Questions (1–20) 1. What is HTML? 2. Difference between HTML4 and HTML5 3. What are semantic tags in HTML5? 4. Difference between <div> and <span> 5. What is the purpose of DOCTYPE? 6. What are meta tags? 7. Difference between ID and Class 8. What are inline and block elements? 9. Explain forms in HTML 10. Difference between GET and POST 11. What is localStorage and sessionStorage? 12. What are data attributes? 13. What is iframe? 14. Difference between cookies and localStorage 15. What are void elements? 16. What is the purpose of alt attribute? 17. Explain audio and video tags 18. What is accessibility in HTML? 19. What are ARIA attributes? 20. What is the difference between strong and b tags? 🎨 2. CSS Interview Questions (21–45) 21. What is CSS? 22. Difference between inline, internal, and external CSS 23. What is specificity in CSS? 24. Explain CSS Box Model 25. Difference between margin and padding 26. What is Flexbox? 27. What is CSS Grid? 28. Difference between relative, absolute, fixed, and sticky positioning 29. What is z-index? 30. Difference between em, rem, %, px, vh, and vw 31. What are pseudo-classes? 32. What are pseudo-elements? 33. Difference between visibility:hidden and display:none 34. What is media query? 35. Explain responsive design 36. What is mobile-first design? 37. What are CSS transitions? 38. Difference between transition and animation 39. What is transform property? 40. What is overflow property? 41. Explain CSS inheritance 42. What is !important? 43. What are CSS preprocessors? 44. Difference between SCSS and SASS 45. What is Bootstrap? ⚡ 3. JavaScript Basics (46–80) 46. What is JavaScript? 47. Difference between var, let, and const 48. What are data types in JavaScript? 49. Difference between null and undefined 50. What is hoisting? 51. Explain scope in JavaScript 52. What is closure? 53. What is callback function? 54. What is arrow function? 55. Difference between == and === 56. What is event bubbling? 57. What is event capturing? 58. What is event delegation? 59. What is DOM? 60. Difference between synchronous and asynchronous programming 61. What is promise in JavaScript? 62. What are async and await? 63. What is setTimeout? 64. Difference between map(), filter(), and reduce() 65. What is destructuring? 66. What is spread operator? 67. What is rest operator? 68. What is template literal? 69. What is optional chaining? 70. Explain this keyword 71. Difference between function declaration and expression 72. What is prototype? 73. What is prototypal inheritance? 74. What is JSON? 75. Difference between localStorage and sessionStorage 76. What is NaN? 77. What are truthy and falsy values? 78. What is debounce? 79. What is throttle? 80. What is currying? ⚛️ 4. ReactJS Interview Questions (81–110) 81. What is React? 82. What are components in React? 83. Difference between functional and class components 84. What is JSX? 85. What are props? 86. What is state? 87. Difference between state and props 88. What is useState hook? 89. What is useEffect hook? 90. What is virtual DOM? 91. What is reconciliation? 92. What are keys in React? 93. What is prop drilling? 94. What is Context API? 95. What is Redux? 96. Difference between Redux and Context API 97. What are React hooks? 98. What is useRef? 99. What is useMemo? 100. What is useCallback? 101. What is lazy loading in React? 102. What is React Router? 103. What are controlled components? 104. What are uncontrolled components? 105. What is lifting state up? 106. What is Higher Order Component (HOC)? 107. What are custom hooks? 108. What is Strict Mode? 109. What is server-side rendering? 110. Difference between CSR and SSR

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