Conceptual

This interview evaluates your understanding of frontend technologies, web fundamentals, and engineering principles through technical discussions.

81 Questions

How does the box model work in CSS?

How does browser work?

JavaScriptHTMLCSS

call( ) vs apply( )

call( ) vs bind( )

CSR vs SSR

What is event delegation in JavaScript?

What is event loop?

How to improve website performance?

How to work with slow API call?

this keyword in JavaScript

var vs let vs const

Virtual DOM in React

What does preventDefault() do?

What is a closure in JavaScript?

What is AB Testing?

What is the event loop in JavaScript?

What is Responsive Design?

async vs defer

Code Splitting

JavaScriptPerformance

What is dangerouslySetInnerHTML in React?

== vs ===

Frontend Security

Garbage Collection

JavaScriptPerformance

key prop in react

preventDefault() vs stopPropagation()

translate vs absolute positioning

What is tree shaking?

JavaScriptPerformance

useMemo vs useCallback

use strict

Arrow functions

What is cookie?

What is hoisting in JavaScript?

What is an anonymous function and when would you use it?

box-sizing: border-box

What is a static method in a class?

Content Security Policy (CSP)

Cross Origin Resource Sharing (CORS)

Cross-Site Scripting (XSS)

What data structure is used to represent the DOM?

default vs named export

JavaScriptReact

HTTP Methods

Image Failures in Production

inline vs inline-block vs block

Microtask vs Macrotask

null vs undefined vs undeclared

optimize react context performance

Primitive vs Reference

Production checklist for launch

Redux vs React Context API?

Reference vs Syntax Error

Rules of React Hooks

Role of semantic HTML in accessibility

HTMLAccessibility

What is semantic HTML?

HTMLAccessibility

sessionStorage vs localStorage vs cookie

How would you test a React application?

useEffect vs useLayoutEffect

What are Web Vitals?

What is callback hell?

What is Immutability?

What is the Beacon API?

Critical Rendering Path

What is doctype in HTML?

What is a higher order function?

How does inheritance work in JavaScript?

How would you implement dark mode and light mode?

HTMLCSSJavaScript

What is inversion of control?

Reset vs Normalize CSS

Server Sent Events

state vs props

What is Test Driven Development?

How to truncate text using CSS only

What does typeof operator do?

What is an async thunk?

What is TDZ in JavaScript?

What is a thunk?

Where Do We Use Observer Pattern in Frontend Development?

Why do we use polyfills?

Why are functions first-class objects?

What is a symbol type?

sync vs async function

Can callbacks be synchronous?