Frontend Developer Interview Questions
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Frontend Developer Interview Questions

Prep for the interview and get the job you want

About the Book

Your next job interview is a crucial moment in your life, to land your dream job you must prepare for the most challenging questions you might have during the interview. This book is a collection of questions and answers that will help you get ready for that important moment.

More than 80 questions with answers splitted in 3 chapters covering:

  • HTML
  • CSS
  • Javascript

Plus a Free Gift inside for you !!

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ReactJS Documentation

Backend Developer Interview Questions

VueJS Documentation

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DevOPs

Data Science Workflow for Beginners

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About the Author

Alejandro Garcia
Alejandro Garcia

I started my coding career back in 2003. Lately I've been involved a lot in Javascript for frontend and the backend.

I would love passing along to you some of the experiences and challenges I've faced over the years.

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Table of Contents

  • Other Books by Alejandro
  • Your Free Gift
  • Introduction
    • Who is this book for ?
    • What this book covers ?
  • Chapter 1: HTML Interview Questions
    • What does a DOCTYPE do?
    • How do you serve a page with content in multiple languages?
    • What kind of things must you be wary of when designing or developing for multilingual sites?
    • What are data- attributes good for?
    • Consider HTML5 as an open web platform. What are the building blocks of HTML5?
    • Describe the difference between a cookie, sessionStorage and localStorage.
    • Describe the difference between <script>, <script async> and <script defer>.
    • Why is it generally a good idea to position CSS <link>s between <head></head> and JS <script>s just before </body>? Do you know any exceptions?
    • What is progressive rendering?
    • Why you would use a srcset attribute in an image tag? Explain the process the browser uses when evaluating the content of this attribute.
    • Have you used different HTML templating languages before?
  • Chapter 2: CSS Interview Questions
    • What is CSS selector specificity and how does it work?
    • What’s the difference between “resetting” and “normalizing” CSS? Which would you choose, and why?
    • Describe floats and how they work.
    • Describe z-index and how stacking context is formed.
    • Describe Block Formatting Context (BFC) and how it works.
    • What are the various clearing techniques and which is appropriate for what context?
    • Explain CSS sprites, and how you would implement them on a page or site.
    • How would you approach fixing browser-specific styling issues?
    • How do you serve your pages for feature-constrained browsers? What techniques/processes do you use?
    • What are the different ways to visually hide content (and make it available only for screen readers)?
    • Have you ever used a grid system, and if so, what do you prefer?
    • Have you used or implemented media queries or mobile-specific layouts/CSS?
    • Are you familiar with styling SVG?
    • Can you give an example of an @media property other than screen?
    • What are some of the “gotchas” for writing efficient CSS?
    • What are the advantages/disadvantages of using CSS preprocessors?
    • Describe what you like and dislike about the CSS preprocessors you have used.
    • How would you implement a web design comp that uses non-standard fonts?
    • Explain how a browser determines what elements match a CSS selector.
    • Describe pseudo-elements and discuss what they are used for.
    • Explain your understanding of the box model and how you would tell the browser in CSS to render your layout in different box models.
    • What does * { box-sizing: border-box; } do? What are its advantages?
    • What is the CSS display property and can you give a few examples of its use?
    • What’s the difference between inline and inline-block?
    • What’s the difference between a relative, fixed, absolute and statically positioned element?
    • What existing CSS frameworks have you used locally, or in production? How would you change/improve them?
    • Have you played around with the new CSS Flexbox or Grid specs?
    • Can you explain the difference between coding a website to be responsive versus using a mobile-first strategy?
    • How is responsive design different from adaptive design?
    • Have you ever worked with retina graphics? If so, when and what techniques did you use?
    • Is there any reason you’d want to use translate() instead of absolute positioning, or vice-versa? And why?
  • Chapter 3: Javascript Interview Questions
    • Explain event delegation
    • Explain how this works in JavaScript
    • Explain how prototypal inheritance works
    • What do you think of AMD vs CommonJS?
    • Explain why the following doesn’t work as an IIFE: function foo(){ }();. What needs to be changed to properly make it an IIFE?
    • What’s the difference between a variable that is: null, undefined or undeclared? How would you go about checking for any of these states?
    • What is a closure, and how/why would you use one?
    • Can you describe the main difference between a .forEach loop and a .map() loop and why you would pick one versus the other?
    • What’s a typical use case for anonymous functions?
    • How do you organize your code? (module pattern, classical inheritance?)
    • What’s the difference between host objects and native objects?
    • Difference between: function Person(){}, var person = Person(), and var person = new Person()?
    • What’s the difference between .call and .apply?
    • Explain Function.prototype.bind.
    • When would you use document.write()?
    • What’s the difference between feature detection, feature inference, and using the UA string?
    • Explain Ajax in as much detail as possible.
    • What are the advantages and disadvantages of using Ajax?
    • Explain how JSONP works (and how it’s not really Ajax).
    • Have you ever used JavaScript templating? If so, what libraries have you used?
    • Explain “hoisting”.
    • Describe event bubbling.
    • What’s the difference between an “attribute” and a “property”?
    • Why is extending built-in JavaScript objects not a good idea?
    • Difference between document load event and document DOMContentLoaded event?
    • What is the difference between == and ===?
    • Explain the same-origin policy with regards to JavaScript.
    • Make this work:
    • Why is it called a Ternary expression, what does the word “Ternary” indicate?
    • What is "use strict";? What are the advantages and disadvantages to using it?
    • Create a for loop that iterates up to 100 while outputting “fizz” at multiples of 3, “buzz” at multiples of 5 and “fizzbuzz” at multiples of 3 and 5.
    • Why is it, in general, a good idea to leave the global scope of a website as-is and never touch it?
    • Why would you use something like the load event? Does this event have disadvantages? Do you know any alternatives, and why would you use those?
    • Explain what a single page app is and how to make one SEO-friendly.
    • What is the extent of your experience with Promises and/or their polyfills?
    • What are the pros and cons of using Promises instead of callbacks?
    • What are some of the advantages/disadvantages of writing JavaScript code in a language that compiles to JavaScript?
    • What tools and techniques do you use for debugging JavaScript code?
    • What language constructions do you use for iterating over object properties and array items?
    • Explain the difference between mutable and immutable objects.
    • How can you achieve immutability in your own code?
    • Explain the difference between synchronous and asynchronous functions.
    • What is event loop? What is the difference between call stack and task queue?
    • Explain the differences on the usage of foo between function foo() {} and var foo = function() {}
    • What are the differences between variables created using let, var or const?
    • What are the differences between ES6 class and ES5 function constructors?
    • Can you offer a use case for the new arrow ⇒ function syntax? How does this new syntax differ from other functions?
    • What advantage is there for using the arrow syntax for a method in a constructor?
    • What is the definition of a higher-order function?
    • Can you give an example for destructuring an object or an array?
    • ES6 Template Literals offer a lot of flexibility in generating strings, can you give an example?
    • Can you give an example of a curry function and why this syntax offers an advantage?
    • What are the benefits of using spread syntax and how is it different from rest syntax?
    • How can you share code between files?
    • Why you might want to create static class members?
  • Keep developing your interviewing skills
  • About the Author

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