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Top 50 HTML, CSS & JS Interview Questions to Hire Front-End Developer

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03 March, 2023

Who doesn’t need front-end developers these days?

With the increasing demand for mobile and web applications, companies must have a talented front-end developer to bring their vision to life. Large companies are always hungry for more front-end developers to overtake the competition in the tech race.

But hiring skilled developers who can bring real value to your team takes time and effort. After all, there’s just so much to consider before making a hire.

For example, gauging a developer’s skills based on a resume alone is difficult. A front-end developer’s resume doesn’t adequately communicate a candidate’s abilities, such as technical skills, code quality, and language proficiency.

That’s why as a recruiter, you should think carefully about the questions you ask your potential developers during an interview. In this article, we’ll provide 50 HTML CSS and JavaScript interview questions to cover everything you need to know about the developer you want to hire.

Let’s start!

 

Front-End Developer: An In-Depth Look into Its Role

The right HTML, CSS, and JavaScript interview questions can help you assess a developer’s hard skills, soft skills, and behavioral intelligence. A front-end developer should possess several skills to ensure quality output. Let’s quickly look at some of the most sought-after skills in a front-end developer.

1. A front-end developer must understand user experience to create websites and mobile applications.

2. Ability to work with different programming languages, including HTML and CSS.

3. A strong understanding of CSS pre-processors.

4. Understanding of JavaScript and jQuery.

5. Proficient in Web Designing.

6. Soft Skills.

 

 

Spending too much time on screening candidates? Use iMocha's online skills assessments to improve hiring time.

 

 

HTML CSS and JavaScript Interview Questions to Hire Experienced Candidate

By conducting technical interviews, you will identify the best front-end developer for your business requirements and ensure they are a good fit for your in-house team.

These HTML CSS and JavaScript interview questions will help you verify a candidate’s technical skills and proficiencies. It will also enable hiring managers to gauge a candidate’s communication and problem-solving skills required for the role.

I) HTML Interview Questions

  1. What is Marquee in HTML?
  2. What is Semantic HTML, and how does it work?
  3. How do you display a Table on an HTML Webpage?
  4. What’s the difference between HTML5 and HTML4?
  5. What is the difference between canvas and svg?
  6. Why you would use a srcset attribute in an image tag? Explain the process the browser uses when evaluating the content of this attribute.
  7. Consider HTML5 as an open web platform. What are the building blocks of HTML5?
  8. How do you serve a page with content in multiple languages?

  II) CSS Interview Questions

  1. What is the best way to include CSS Styling in HTML?
  2. Mention the different types of CSS Selectors.
  3. How do you create a responsive layout?
  4. How do you use animation and transitions?
  5. Describe Floats and how they work.
  6. How would you implement a web design comp that uses non-standard fonts?
  7. Can you give an example of a pseudo-class?
  8. What’s the difference between the "nth-of-type()" and "nth-child()" selectors?

 III) JavaScript Interview Questions

  1. What is Callback in JavaScript?
  2. What’s the difference between Function Declaration and Function Expression?
  3. What are Closures in JavaScript?
  4. What is the best way to remove Duplicates from a JavaScript Array?
  5. Explain how this works in JavaScript. Can you give an example of one of the ways that working with this has changed in ES6?
  6. Write an immediately invoked function expression (IIFE)
  7. How can you share code between files?
  8. Can you explain how to destruct an object or an array?
  9. Build a comments section that has the following properties:
    1. The user can add comments directly.
    2. The user can add a reply to any comment. 
    3. The user can add a reply to any comment which is a reply.


HTML CSS and JavaScript Interview Questions to Hire Entry-Level Candidates

I) HTML Interview Questions

  1. What standard HTML lists are used when designing a page?
  2. What is the difference between HTML elements and tags?
  3. How to insert a copyright symbol on a browser page?
  4. How to create a nested webpage in HTML?
  5. Can you create multi-colored text on a web page?
  6. How to make a picture of a background image of a web page?
  7. What is the use of an iframe tag?
  8. What are the different new form element types in HTML 5?

  II) CSS Interview Questions

  1. What are the limitations of CSS?
  2. How many ways can CSS be integrated into a web page?
  3. What is CSS Box Model, and what are its elements?
  4. Compare Grouping and Nesting in CSS?
  5. Define the float property of CSS?
  6. How can comments be added in CSS?
  7. What is an Alternate Style Sheet?
  8. What is at-rule?

 III) JavaScript Interview Questions

  1. What are the differences between the =, ==, and === operators?
  2. How would you use escape characters to log quotes in a string correctly? For example, “We are “good” friends.”
  3. Write a loop that prints every number divisible by three from 1-200.
  4. What are the .slice() and .splice() methods, and how do they differently affect arrays?
  5. How would you submit a form in JavaScript?
  6. How would you write an object for a database containing the following person’s details: Jack, age 45, with hazel eyes and ID number 5000.
  7. What is the DOM? And what does it do?
  8. What are the various Data Types in JavaScript?
  9. What is Scope in JavaScript?

 

Want to know how iMocha helped companies like Capgemini, TCS, and Vanguard hire the best software developers?

 

How to Evaluate the Skills of a Front-End Developer?

It is vital to understand the difficulty of the question and the level of expertise required for the position you are trying to fill.

For example, if you are trying to fill a junior developer role, you may want to ask relatively easy questions that don’t require a lot of experience. If you are looking for a senior-level developer, you can ask more complex questions that need more expertise.

The benefit of evaluating a candidate is that it provides an accurate analysis of their skills. This helps a recruiter better understand their expertise and how they might perform on the job.

That is why technical interviews are a necessary part of the recruiting process. Many companies conduct these interviews with a skills intelligence platform like iMocha.

iMocha is a skills intelligent platform that offers recruitment solutions to hire top talent by testing and evaluating their skills and abilities. It provides the most extensive skill assessment library with over 2500+ skills, including database, next-gen, coding, and communication skills.

Ways for recruiters to check developers’ coding skills:

  • Recruiters can screen candidates for technical abilities with iMocha’s AI-LogicBox (an innovative platform for assessing skills for languages where compilers aren’t available).
  • This platform offers the option to integrate video questions within the assessment. These pre-recorded answers will enable you to assess candidates faster and objectively.
  • With iMocha’s Live Coding Interview, you can evaluate a candidate’s programming skills, thinking style, and coding knowledge.
  • You can evaluate candidates on their hands-on project-handling abilities that go beyond bookish knowledge with iMocha Projects.
  • This platform also offers Smart Video Proctoring to strengthen security with accurate cheating detection.
  • iMocha’s talent analytics will help you measure a candidate’s performance and identify proficiency levels.

Tips for Interviewing Front-End Developers

Here are some tips to remember while assessing a programmer’s technical skills and identifying whether or not they will be a good fit for the job.

1. The first and most important step to hiring a front-end developer is to outline your company’s needs.

2. Understand what you need the candidate to bring to the position and evaluate them based on those relevant skills.

3. While a candidate’s experience is vital, their curiosity determines how eager they are to learn new things and how well they will fit into your company’s culture.

4. Show off your company’s accomplishments. This will naturally make your company stand out and attract the finest talent.

5. Use real-world coding challenges to assess a developer’s abilities.

6. Finally, don’t forget to examine a front-end developer’s previous work experience. This can help you get a sense of their coding abilities and overall approach to development.

 

 

Conclusion

Hiring front-end developers may be difficult, but it’s not impossible. What you ask the developer during the interview will depend on the needs of your development team and company.

By asking these HTML CSS and JavaScript interview questions, you can narrow your list of potential hires to hire only the best. Use these questions to your advantage and ensure that your candidates are skilled in the areas that are most important to you.

  

FAQ Reference

1. How do I hire a Front-end developer?

Here are the criteria and specifications when it comes to recruiting a front-end developer:

  • A front-end developer must be proficient in coding languages such as HTML, CSS, and JavaScript.
  • Apart from these three primary languages, there are other essential technologies and tools they should be familiar with, including: ECMAScript Programming Language (ES6), Ajax, jQuery, JS frameworks, and CSS Preprocessor.
  • A front-end developer must know how to use a lightweight and robust framework.
  • Testing and bug fixing: Writing error-free codes and resolving potential threats.
  • The developer must know how to secure a website via an SSL certificate and encrypting via HTTPS protocol.
  • Communication and problem-solving skills.

2. How much should I pay a front-end developer?

According to Indeed, an average front-end developer in the United States makes about $109,316 a year.

 

The hiring time for software developers spans about 24 days. With iMocha, you can reduce your hiring time to 7 days per role.

 

Gemma Benny
Gemma Benny
I am a Content Writer at iMocha. A B2B writer that creates articles and listicles while trying to build a relationship with potential clients and also adding value to the content wherever possible. I have previously worked with clients in the medical, fashion, education, IT, and beauty domains. Before joining as a full-time writer, I worked as a digital marketer for over two years. When I am not keeping busy with content writing, you can find me baking, exploring the culinary world, and playing badminton.
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