Web Developer Interview Question And Answers

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Welcome to web developer interview questions and answers. This blog will help you prepare for the interviews and provide a confidence boost that will help you get this awesome job.

Also, keep in mind that it’s really difficult to imagine exactly which questions will be asked during an interview. However, we will cover some of the most important aspects of HTML CSS JavaScript and dev tools.

1. As a web developer, how do you optimize your site’s loading time?

Use of image optimization tools that further compress the image to reduce its size. Avoid Inline JS and CSS files it is a good practice to place your website’s JS and CSS in external files. Optimize Caching, your browser can store these resources or files for subsequent requests. On repeated page loads these files can be retrieved from the cache rather than downloaded all over again from the network. 

2. What do you know about HTTP/3?

HTTP/3 is the third and upcoming major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web.

3. Explain what is CORS? 

Cross-Origin Resource Sharing (CORS) is an HTTP-header based mechanism that allows a server to indicate any origins (domain, scheme, or port) other than its own from which a browser should permit loading resources.

4. What is an ETag?

An ETag (entity tag) is an HTTP header that is used to validate that the client (such as a mobile device) has the most recent version of a record.

5. In what programming languages are you proficient?

HTML, CSS, SQL, PHP, Ruby, Python and JavaScript are a few of the common coding languages a web developer should be able to navigate comfortably. 

Web Developer Interview Question And Answers


6. What is CDN in jQuery? 

A CDN (Content Delivery Network) is a group of servers spread out over many locations.

7. What is blockchain?

Blockchain is a system of recording information in a way that makes it difficult or impossible to change, hack, or cheat the system.

8. What is npm?

npm is the package manager for the Node JavaScript platform. It puts modules in place so that nodes can find them, and manages dependency conflicts intelligently.

9. Explain Me The Difference Between Cookies, Sessionstorage, And Localstorage?

Cookies are small text files that websites place in a browser for tracking or login purposes. Meanwhile, localStorage and sessionStorage are new objects, both of which are storage specifications but vary in scope and duration. Of the two, localStorage is permanent and website-specific whereas sessionStorage only lasts as long as the duration of the longest open tab.

10. What are some of the pop-up boxes available in JavaScript? 


11. What is the difference between <div> and <frame> in HTML?

With frames, you can display more than one document in the browser window. Also, the <frame> tag can be used to declare a separate window within a frameset.

With division, you can define a section in an HTML document and block elements within certain formats and styles. Division can serve local content, although the content is not independent of the page constituent.

12. What is Ajax? 

AJAX stands for Asynchronous JavaScript And XML. In a nutshell, it is the use of the XMLHttpRequest object to communicate with servers.

13. What is Responsive Web Design?

Responsive web design (RWD) is a web development approach that creates dynamic changes to the appearance of a website, depending on the screen size and orientation of the device being used to view it.

14. What are pseudo-classes used for?

A pseudo-class is used to define a special state of an element. For example, it can be used to Style an element when a user mouses over it.

15. What is the DOCTYPE Declaration in HTML?

The HTML document type declaration, also known as DOCTYPE is the first line of code required in every HTML or XHTML document. 

16. What is lazy loading on the website?

Lazy loading images means loading images on websites asynchronously — that is, after the above-the-fold content is fully loaded, or even conditionally, only when they appear in the browser’s viewport.

17. 6 reasons why you should be using SVG?

  • Its resolution-independent and responsive
  • It’s got a navigable DOM
  • It’s Animatable
  • It’s style-able
  • It’s interactive
  • Small file sizes

18. What is the difference between grouping and nesting?

Nesting property facilitates nesting one style rule inside another, with the selector of the child rule that is relative to the selector of the parent rule. Grouping property provides the same properties with values to a number of selectors at a time.

19. What is grouping in HTML?

Grouping in CSS is a technique used to reduce code redundancy and write clean, concise easy follow code.

20. What is transition in css3?

CSS transitions provide a way to control animation speed when changing CSS properties.

21. What happens to an element when it floats?

When an element is tagged “float” it runs to either the left or the right basically until it hits the wall of its container element. 

22. What is the Z index and how is it used?

The z-index property is used to displace elements on the z-axis i.e in or out of the screen. It is used to define the order of elements if they overlap with each other.

23. What are 3 types of data in JavaScript?

JavaScript allows you to work with three primitive data types: numbers, strings of text (known as “strings”), and boolean truth values (known as “booleans”). JavaScript also defines two trivial data types, null and undefined, each of which defines only a single value.

24. What is the use of deferring attributes?

The HTML defer attribute is a Boolean attribute that is used to specify that script is executed when the page has finished parsing. This attribute only works with external scripts.

25. What is Deferred and Promise JavaScript?

A promise is a placeholder for a result that is initially unknown while a deferred represents the computation that results in the value. Every deferred has a promise which functions as a proxy for the future result.

26. What do you mean by pair programming?

Pair programming is an important technique for developing higher quality code, faster while also reducing risk and spreading knowledge in an organization.

27. What are the security features of a website?

  • Registry lock.
  • Hotlink protection.
  • Spam stop feature.
  • DDOs attack protection.
  • Secure sockets layer (SSL protection)
  • Two-Step verification.
  • Secure administrative passwords.
  • Bot Blocking.

28. What is protocol in HTML?

The protocol property sets or returns the protocol part of the Href attribute value. The Href attribute specifies the destination of a link in an area. The protocol is a standard that specifies how data are transmitted between computers.

29. What are two differences between HTTP 1 and 2?

HTTP2 is much faster and more reliable than HTTP1. HTTP1 loads a single request for every TCP connection, while HTTP2 avoids network delay by using multiplexing. HTTP is a network delay-sensitive protocol in the sense that if there is less network delay, then the page loads faster.

30. What are the main features of HTML5?

  • Cleaner and more Improved Code.
  • Better Semantics.
  • Enhanced Uniformity.
  • Mutuality.
  • Well-Designed Forms.
  • Ensures Better Accessibility.
  • Better Offline Browsing.

Want to crack Web Developer Interview ?

There is seriously no rocket science for clearing Web Developer Interview. They are just like normal interviews, a mere conversation between you and the interviewer.

You just have to stand out from the other students who are attending off-campus. Here, I would like you to take care of a few things:

First and foremost, walk-in with confidence and to be ve
The first step is aptitude so prepare well, for that and after that, you have to prepare the following.

One Programming Language: You have to perfect one programming language(Either C or java anyone)

Chose one programming language and read all the basics, and learn some programs.

Problem Solvingyou have to good problem solver Logical and analytical

Communication Skill Last but not least, you must have strong communication skills to achieve the target. Simply be confident, talk clearly and give your 100%. (Try to exercise in front of the mirror or record your videos while answering some questions and then share those videos or audios to your friends and mentors -so, that they can correct you beforehand.)
When you are talking about reputation and credibility what are factors that plays an important role:-

1- Academics & Achievements

2- Extracurricular activities

3- Projects

4- Social work or any valuable assignment done or currently doing

TAKE ONE STEP AT A TIME. If your legs are on two boats then you will fall from both. Go to interview like it’s the last, there is no other option and you really wanna do the work company doing, not for money.
Talk politely and boldly with everyone you meet as you are not the only one in the queue and also not the “Albert Einstein”.Always remember to say hello and thank you.

Your appearance matter in interview wears a white shirt and black pant with the back shoe.
At last but not least “don’t lie in your resume”. If you do know something then don’t include it in your resume. A resume represents you to the company if a lie is in there then you are simply a liar. Having a page full of crappy things or lies is no good, it’s better to write what you really know and past work experience.

Web Developer Interview Question And Answers


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