Web Developer Interview Questions And Answers 2020 [Latest]

Web Developer Interview Questions

Web Developer Interview Questions And Answers for experienced professionals from Codingcompiler. These Web Developer interview questions were asked in various interviews conducted by top multinational companies across the globe. We hope that these interview questions on Web Developer will help you in cracking your job interview. All the best and happy learning.

In this Web Developer Interview Questions Blog, You Will Learn
 

  1. Web Developer Interview Questions
  2. Web Developer Interview Questions and Answers
  3. Frequently asked Web Developer Interview Questions 
  4. Advanced Web Developer Interview Questions and Answers
  5. Real-Time Web Developer Interview Questions And Answers

Web Developer Interview Questions

1. What is a pseudo-class?
2. What is Namespacing in JavaScript?
3. What’s the difference between SOAP and REST?
4. List some of the input types that are new to HTML5.
5. Which CMSs have you worked with?
6. What is CORS?
7. What are the advantages of HTTP 2.0 over HTTP 1.1?
8. What’s the best way to integrate 5 different stylesheets into a website?
9. How are your SQL skills?
10. What is your preferred development environment?

Web Developer Interview Questions and Answers

1. What is a pseudo-class?

Ans. It is a CSS technique that sets the style when an element changes its state. E.g. style changes when mouse hover, different styles for visited or unvisited links, etc.


2. What is Namespacing in JavaScript?

Ans. It is usually not a good practice to use global variables in programming languages including JavaScript. However, you may be forced to use global variables sometimes. So, JavaScript introduces the concept of namespacing which ties down a part of the code and registers it with a unique name.

3. What’s the difference between SOAP and REST?

Ans: These are two web service protocols that developers should know. One of the key differences is that SOAP uses XML while REST also supports text, JSON and other formats. Web developers may have strong opinions about which one is better, but they should demonstrate an understanding of both. 

4. List some of the input types that are new to HTML5.

Ans: HTML5 has been around for several years now, so a good candidate should be able to name at least a few of the following: color, date, datetime-local, email, month, number range, search, tel, time, url, week.

5. Which CMSs have you worked with?

Ans: Some common open-source content management systems (CMSs) are WordPress, Joomla and Drupal. To elicit more information, ask if they’re involved in the relevant open-source communities and whether they’ve ever made any contributions. 

6. What is CORS?

Ans. Cross-Origin Resource Sharing (CORS) is a mechanism that enables different resources on a web page to be requested from another domain outside the domain from which the request originated.

7. What are the advantages of HTTP 2.0 over HTTP 1.1?

Ans. The major advantages are: headers compression, push notification, intelligent packet streaming management and parallel loading of page elements over a single TCP connection.

8. What’s the best way to integrate 5 different stylesheets into a website?

Ans. It usually depends on how the site is laid out. However, in most cases combining the stylesheets into a single one is the best approach. You can use Gulp to do so.

9. How are your SQL skills?

Ans: Database expertise may not be listed in the job requirements, but most web developers will need to work with SQL Server or MySQL during the course of their duties. Any practical experience, such as having worked as a database administrator, is highly valuable. 

10. What is your preferred development environment?

Ans. This question is not about checking if you are perfect for the same environment as the organization works but to measure if you are flexible to work in any environment. So, give them a hint that you are able to adapt to any environment with the core skills that you have.

Frequently asked Web Developer Interview Questions 


11. What is the difference between null value and undefined value?

Ans. Undefined means a variable has been declared but has not yet been assigned a value. On the other hand, null is an assignment value.

12. What is Scope in JavaScript? Name the different types of Scopes.

Ans. The scope defines the accessibility of the functions and variables in an application. There are two types of scopes: local and global.

13. What All New Form Elements Got Introduced In HTML5?

Ans: 

Here is the list of new form elements available in HTML5.

<datalist> – It specifies a list of options for input controls.

<keygen> – This tag generates an encryption key.

<output> – It defines the result of an expression.

14. What Is SVG And Why Do You Use It?

Ans: SVG is an acronym for Scalable Vector Graphics as recommended by W3C.

  • Its purpose is to display the vector-based graphics over the Web.
  • The graphics use an XML format.
  • SVG graphics are of higher quality and do not lose it even when resized.
  • All elements and attributes of SVG support animation.

15. How Does Canvas Differ From SVG?

Ans: Here are a few points elaborating the differences between Canvas and SVG.

  • Canvas depends on the resolution whereas SVG doesn’t.
  • It does not allow event handlers whereas SVG does provide the support for event handlers.
  • Canvas is ideal for graphic-intensive games whereas SVG doesn’t intend for gaming.
  • It works well for small rendering areas whereas SVG may perform better for large rendering areas like Google Maps.

16. What Is HTML5 Web Storage?

Ans: HTML5 brought this new ability to store web pages within the browser cache. This web store is not only faster than the cookies but secured too. It is capable of storing a large amount of data without compromising the performance of the website.

Also, note that the cached data is not a must for every server request. Instead, it gets utilized only when the page asks for it. And the web page which receives the data stored can access it.

17. What tools do you use to find a performance bug?

Ans: This will depend on your candidate’s development environment as different programming languages use different profilers and some frameworks have built-in debug tools to find performance issues. This doesn’t matter too much, but their approach does.

18.  Explain to Me What Is The Difference In Caching Between Html5 And The Old Html?

Answer :
An important feature of HTML5 is the Application Cache. It creates an offline version of a web application. and store website files such as HTML files, CSS, images, and JavaScript, locally. It is a feature that speeds up site performance.

19. Explain Me What Is $(document).ready() Function? Why Should You Use It?

Answer :

This is one of the most important and frequently asked questions. The ready() function is used to execute code when the document is ready for manipulation. jQuery allows you to execute code, when DOM is fully loaded i.e. HTML has been parsed and the DOM tree has been constructed. The main benefit of $(document).ready() function is that it works in all browsers, jQuery handles cross-browser difficulties for you. For curious readers see the answer link for more detailed discussion.

20. Explain to Me What Is The Difference Between <div> And <frame>?

Answer :

A <div> is a generic container element for grouping and styling, whereas a <frame> creates divisions within a web page and should be used within the <frameset> tag. The use of <frame> and <frameset> are no longer popular and are now being replaced with the more flexible <iframe>, which has become popular for embedding foreign elements (ie. Youtube videos) into a page.

Advanced Web Developer Interview Questions and Answers

21. Do You Know What Is The Difference Between Jquery.get() And Jquery.ajax() Method?

Answer :

The ajax() method is more powerful and configurable, allows you to specify how long to wait and how to handle the error. The get() method is a specialization to just retrieve some data.

22. Do You Know The Real Difference Between Html And Html5?

Answer :

From a broader perspective, HTML was a simple language for laying out text and images on a webpage, whereas HTML5 can be viewed as an application development platform that does what HTML does that and more, including better support for audio, video, and interactive graphics.

It has a number of new elements, supports offline data storage for applications, and has more robust exchange protocols. Thus, proprietary plug-in technologies like Adobe Flash, Microsoft Silverlight, Apache Pivot, and Sun JavaFX are no longer needed, because browsers can now process these elements without additional requirements.

23. What Is The New Doctype?

Answer :

Instead of typing out a ridiculously long DOCTYPE statement to tell the browser how to render your webpage, this long line of code has been truncated too.

24. What are the responsibilities of a web developer?

Answer: A web developer should fully understand their role and how they contribute to web design and development. This question will help you find out how a candidate plans to support the team and what tasks they will take ownership of.

  • What to look for in an answer:
  • A clear understanding of web development processes
  • What tasks they emphasize
  • How they plan to contribute

Example: “A web developer designs, develops, enhances, tests and deploys web applications with an end goal of creating engaging and user-friendly site layout and function. A developer gathers and defines requirements, maintains websites, troubleshoots and fixes bugs, follows best practices and collaborates with other teams.”

25. What is Design Patterns and why anyone should use them? 

Answer:

Design patterns are a well-described solution to the most commonly encountered problems which occur during software development.

Design pattern represents the best practices evolved over a period of time by experienced software developers. They promote reusability which leads to a more robust and maintainable code.

26. Explain How Do You Make Comments Without Text Being Picked Up By The Browser?

Answer :

Comments are used to explain and clarify code or to prevent code from being recognized by the browser. Comments start with “*<!–” and end with ” –>“.

<!– Insert comment here. →

27. Explain to Me What Are Three Ways To Reduce Page Load Time?

Answer :

Reduce image sizes, remove unnecessary widgets, HTTP compression, put CSS at the top and script references at the bottom or in external files, reduce lookups, minimize redirects, caching, etc.

28. What is the purpose of the alt attribute on images?

Answer: The alt attribute provides alternative information for an image if a user cannot view it. The alt attribute should be used to describe any images except those which only serve a decorative purpose, in which case it should be left empty.

29. What is npm?

Answer:  npm stands for Node Package Manager. npm provides following two main functionalities:

Online repositories for node.js packages/modules which are searchable on search.nodejs.org

Command-line utility to install packages, do version management and dependency management of Node.js packages.

30. What is webpack?

Ans: Webpack is a build tool that puts all of your assets, including Javascript, images, fonts, and CSS, in a dependency graph. Webpack lets you use require() in your source code to point to local files, like images, and decide how they’re processed in your final Javascript bundle, like replacing the path with a URL pointing to a CDN.

Real-Time Web Developer Interview Questions And Answers

31.  What is the difference between procedural and object-oriented programming?

Ans: 

Procedural programming is based upon the modular approach in which the larger programs are broken into procedures. Each procedure is a set of instructions that are executed one after another. On the other hand, OOP is based upon objects. An object consists of various elements, such as methods and variables.

Access modifiers are not used in procedural programming, which implies that the entire data can be accessed freely anywhere in the program. In OOP, you can specify the scope of particular data by using access modifiers – public, private, internal, protected, and protected internal.

32. What is CORS and how to enable one?

Ans:  request for a resource (like an image or a font) outside of the origin is known as a cross-origin request. CORS (cross-origin resource sharing) manages cross-origin requests. CORS allows servers to specify who (i.e., which origins) can access the assets on the server, among many other things.

Access-Control-Allow-Origin is an HTTP header that defines which foreign origins are allowed to access the content of pages on your domain via scripts using methods such as XMLHttpRequest.

For example, if your server provides both a website and an API intended for XMLHttpRequest access on a remote websites, only the API resources should return the Access-Control-Allow-Origin header. Failure to do so will allow foreign origins to read the contents of any page on your origin.

# Allow any site to read the contents of this JavaScript library, so that subresource integrity works

Access-Control-Allow-Origin: *

33. WHY ARE YOU DRAWN TO WEB DEVELOPMENT?

Ans: It’s a common pitfall to interview for a job and never explicitly say WHY you want to work in this specific field or for this particular employer/company. Even if the question doesn’t get asked, find a way to touch on it during the interview.

34. GIVE AN EXAMPLE OF A NON-CODING/WEB DEVELOPMENT PROBLEM THAT YOU’VE SOLVED, AND WHAT YOUR PROBLEM-SOLVING PROCESS INVOLVED.


Ans: Yes, you’re interviewing for a web developer job, but remember to look to other experiences in your life for inspiration. Examples like the time you helped improve the ordering system at the cafe you worked at or put together a volunteer fundraising effort to save the music program at your kids’ school all speak to the breadth of your problem-solving abilities and experiences.

35. Do You Know What Are Some New Html5 Markup Elements?

Answer :

There are several: <article>, <aside>, <bdi>, <command>, <details>, <figure>, <figcaption>, <summary>, <header>, <footer>, <hgroup>, <mark>, <meter>, <nav>, <progress>, <ruby>, <rt>, <section>, <time>, and <wpr>.

36. What is your preferred working environment?


Ans:  The couch. The beach. Next to the pool table. The office at midnight with the shades closed, with the entire rest of the staff having gone home for the night and you having the whole floor to yourself. Every single person has their own place to think, and their own way of getting into the zone. Sometimes the organization can assist with this, while other times they just need to get out of the way. Whatever methods you have to get your project finished and on time, they’ll want to know about it.

37. Have you used Git for pushing live changes on the website?

Ans. Yes, Git is a great help to streamline live updates on the website. For this, I made use of a post-receive hook. Through this, I was able to copy updates from remote server repo and update it onto the live site.

38. If you had a specific section of code continuously causing problems, what kinds of utilities would you use for troubleshooting?

Ans: 

Log files have been and will always be your friend when it comes to troubleshooting. Granted, the amount of information you actually receive from them can sometimes make you want to pull your hair out, but they are always a great place to start.

When it comes to actual IDEs, on the other hand? While I’ve been trying to stay vendor-neutral in this, since the utility itself can be used for many potential languages, I’m going to give a shout-out to Microsoft’s Visual Studio as it can be a massive assistance in troubleshooting where problems lie. Whether it’s basic features like setting up breakpoints and commenting out code, to auto-complete pointing out misspellings to showing you what’s not going to perform properly during compilation — this type of tool and others like it can be of enormous help.

39. Have you ever worked on consolidating two different existing applications together?

Ans: 

Redundancy can be a good thing, especially when it comes to projects that need to be highly available. However when there are multiple elements pulling the same information to do the same job with only marginal differences? It’s time to consolidate. Sure this requires considerable knowledge of what the applications do and what they talk to, but if it means a streamlining and reducing overall expenses? Sure — it’s usually worth the hassle.

40. Do you have any experience in developing multilingual websites?

Ans. It is not necessary that you hold experience in developing multilingual sites but you must know the basics of how it is done. You can tell the recruiter the process that involves Unicode encoding and usage of the ‘lang’ attribute.

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