Web Development

Web Development Interview Questions Part-2 11. What are semantic HTML elements? Answer: Semantic elements clearly describe their meaning in a human- and machine-readable way. Examples:

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Web Development Interview Questions for Freshers 1. What happens when you type a URL in your browser and press Enter? Answer: DNS lookup happens to find the IP address Browser sends an HTTP/HTTPS request to the server Server processes and sends back HTML/CSS/JS Browser renders the page using its rendering engine 2. What is the difference between GET and POST requests? Answer: GET: Sends data in the URL, used for fetching data POST: Sends data in the body, used for submitting data securely 3. What is a responsive website? Answer: A responsive website adjusts layout and design based on screen size and device (mobile, tablet, desktop), usually using CSS media queries. 4. What is the role of Webpack in web development? Answer: Webpack bundles JavaScript files, CSS, and assets into optimized output for faster website loading and better performance. 5. What is the purpose of async and defer in script tags? Answer: async: Loads script asynchronously and executes it immediately defer: Loads script asynchronously but executes after HTML is parsed 6. What is the difference between localStorage and sessionStorage? Answer: localStorage: Stores data with no expiration sessionStorage: Stores data until the browser tab is closed 7. What is CORS? Answer: CORS (Cross-Origin Resource Sharing) is a browser security feature that restricts cross-domain API calls unless the server allows it. 8. What is the difference between null and undefined in JavaScript? Answer: undefined: A variable declared but not assigned a value null: A variable explicitly set to have no value 9. How do you optimize website performance? Answer: Minify CSS/JS Compress images Use lazy loading Use caching Reduce HTTP requests Use a CDN 10. What is the DOM? Answer: DOM (Document Object Model) represents the structure of an HTML document as objects, which JavaScript can interact with to change content dynamically.

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Master Javascript : The JavaScript Tree 👇 | |── Variables | ├── var | ├── let | └── const | |── Data Types | ├── String | ├── Number | ├── Boolean | ├── Object | ├── Array | ├── Null | └── Undefined | |── Operators | ├── Arithmetic | ├── Assignment | ├── Comparison | ├── Logical | ├── Unary | └── Ternary (Conditional) ||── Control Flow | ├── if statement | ├── else statement | ├── else if statement | ├── switch statement | ├── for loop | ├── while loop | └── do-while loop | |── Functions | ├── Function declaration | ├── Function expression | ├── Arrow function | └── IIFE (Immediately Invoked Function Expression) | |── Scope | ├── Global scope | ├── Local scope | ├── Block scope | └── Lexical scope ||── Arrays | ├── Array methods | | ├── push() | | ├── pop() | | ├── shift() | | ├── unshift() | | ├── splice() | | ├── slice() | | └── concat() | └── Array iteration | ├── forEach() | ├── map() | ├── filter() | └── reduce()| |── Objects | ├── Object properties | | ├── Dot notation | | └── Bracket notation | ├── Object methods | | ├── Object.keys() | | ├── Object.values() | | └── Object.entries() | └── Object destructuring ||── Promises | ├── Promise states | | ├── Pending | | ├── Fulfilled | | └── Rejected | ├── Promise methods | | ├── then() | | ├── catch() | | └── finally() | └── Promise.all() | |── Asynchronous JavaScript | ├── Callbacks | ├── Promises | └── Async/Await | |── Error Handling | ├── try...catch statement | └── throw statement | |── JSON (JavaScript Object Notation) ||── Modules | ├── import | └── export | |── DOM Manipulation | ├── Selecting elements | ├── Modifying elements | └── Creating elements | |── Events | ├── Event listeners | ├── Event propagation | └── Event delegation | |── AJAX (Asynchronous JavaScript and XML) | |── Fetch API ||── ES6+ Features | ├── Template literals | ├── Destructuring assignment | ├── Spread/rest operator | ├── Arrow functions | ├── Classes | ├── let and const | ├── Default parameters | ├── Modules | └── Promises | |── Web APIs | ├── Local Storage | ├── Session Storage | └── Web Storage API | |── Libraries and Frameworks | ├── React | ├── Angular | └── Vue.js ||── Debugging | ├── Console.log() | ├── Breakpoints | └── DevTools | |── Others | ├── Closures | ├── Callbacks | ├── Prototypes | ├── this keyword | ├── Hoisting | └── Strict mode | | END __

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