JavaScript Developer Interview Preparation: Questions and Answers

A complete guide for frontend developer technical interview preparation. Over 300 questions with detailed answers covering HTML5, CSS3, modern JavaScript (ES6+), and practical live coding tasks.

HTML Interview Questions

Most frequently asked HTML5 questions with detailed explanations: semantics, accessibility, DOM API, web components. Examples: Differences between div and section, working with ARIA roles, resource loading optimization.

CSS Interview Questions

Advanced CSS3 questions: Flexbox, Grid, animations, specificity. Analysis of real cases: element centering, responsive layouts, CSS methodologies (BEM, SMACSS), preprocessors.

JavaScript Questions and Answers

In-depth exploration of JavaScript (ES6+): closures, prototypes, asynchronous programming, Promises, async/await. Example challenges: implementing debounce/throttle, API interactions, design patterns.

Live Coding Challenges

Practical JavaScript exercises: algorithms, DOM manipulation, performance optimization. Examples: pagination implementation, comment tree structure, search debounce functionality.