Front End Developer Interview Questions and Answers

In this video Faisal Nadeem shared 10 most important front end developer interview questions and answers.

Q1) What are the key responsibilities of a front-end developer?
Answer: A front-end developer designs and implements the visual and interactive elements of a website or app, ensuring responsiveness, usability, and performance.

Q2) What are HTML, CSS, and JavaScript used for?
Answer: HTML structures content, CSS styles it, and JavaScript adds interactivity and dynamic behavior to web pages.

Q3) What is the difference between classes and IDs in CSS?
Answer: IDs are unique and used once per page, while classes can be reused for styling multiple elements.

Q4) What is the DOM?
Answer: The Document Object Model (DOM) represents the structure of a webpage as a tree of objects that JavaScript can manipulate.

Q5) What are some common frameworks and libraries used in front-end development?
Answer: Popular ones include React, Angular, Vue.js, jQuery, Bootstrap, and Tailwind CSS.

Q6) What is responsive design?
Answer: Responsive design ensures a website looks and works well on all devices, from desktops to smartphones, using flexible layouts and media queries.

Q7) How do you improve website performance?
Answer: By optimizing images, minimizing CSS/JS, using lazy loading, caching, and reducing HTTP requests.

Q8) What are semantic HTML elements?
Answer: Semantic elements like header, footer, and article clearly describe their meaning and improve accessibility and SEO.

Q9) What is the difference between == and === in JavaScript?
Answer: == compares values with type conversion, while === compares both value and type exactly.

Q10) How do you manage cross-browser compatibility issues?
Answer: I use modern frameworks, test in multiple browsers, write clean, standards-based code, and apply fallbacks or polyfills when needed.

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