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Table of contents
1.
Introduction
2.
What is Web Development?
3.
Web Development Interview Questions and Answers for Freshers
3.1.
1)What are the key responsibilities of a web developer?
3.2.
2)How to reduce the loading time of the website?
3.3.
3)How to center an element vertically and horizontally using CSS?
3.4.
4)What is CORS, and how does it work?
3.5.
5)How do you style an entire webpage at once?
3.6.
6)What is the difference between ‘==’ and ‘===’ in JavaScript?
3.7.
7)What is DOM?
3.8.
8)Describe different kinds of HTTP requests supported by RESTful Web services?
3.9.
9) What is SVG, and why is it used?
3.10.
10)What is the scope in JavaScript?
4.
Intermediate Web Developer Interview Questions
4.1.
11)What is the use of Canvas in HTML?
4.2.
12)What are the types of CSS?
4.3.
13)What is AJAX?
4.4.
14)What is a media query in CSS?
4.5.
16)What are CSS box model contents?
4.6.
17)What is lazy loading?
4.7.
18)What are the advantages of HTTP 2.0 over HTTP 1.1?
4.8.
19)What is pagination, and why is it used?
4.9.
20)What are the new APIs provided by HTML 5 standard?
5.
Web Development Interview Questions for Experienced
5.1.
21)What are the IDEs used for web development?
5.2.
22)What is hoisting in JavaScript?
5.3.
23)What is the purpose of closures JavaScript?
5.4.
24)What is an event loop in Node JS?
5.5.
25)what is a grid in Bootstrap?
5.6.
26)State difference between Local Storage and Cookies.
5.7.
27)Explain long polling.
5.8.
28)What are pseudo-classes?
5.9.
29)Explain W3C (World Wide Consortium).
5.10.
30)What are servlets?
6.
Frequently Asked Questions
6.1.
What are 3 things a web developer is responsible for?
6.2.
How do I prepare for a web development interview?
6.3.
What basics should a web developer know?
6.4.
Are web dev interviews hard?
6.5.
How do I clear my web developer interview?
7.
Conclusion
Last Updated: Mar 27, 2024
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Top 30 Web Developer Interview Questions (2024)

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Introduction

Web development is building and maintaining web applications that are hosted on the browser. The web developers code and build these web applications using languages like HTML, CSS, JavaScript, Bootstrap, PHP, Servlets, etc. A lot of companies hire web developers with good knowledge for good packages. In this article, we will look at the most asked top 30 web developer interview questions and the answers for you. 

Top 30 Web Developer Interview Questions 2023

Before we begin, let's understand Web Development in detail.

What is Web Development?

Web development refers to the process of creating and maintaining websites or web applications on the internet. It encompasses various tasks, including web design, web content development, client-side scripting, server-side scripting, network security configuration, and more. Web developers use programming languages, frameworks, and tools to build the structure, functionality, and design of a website or web application. The goal is to create an interactive and user-friendly digital experience that meets specific business or user requirements.

Front-end, back-end, and full-stack web development are the three main categories of web development. A variety of coding languages are used by web developers, also known as "devs," to create websites.
Web development is the work carried out in the background to create websites that look amazing, function quickly, and provide an excellent experience for users. 

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Web Development Interview Questions and Answers for Freshers

1)What are the key responsibilities of a web developer?

A web developer has the following responsibilities:

  1. Build websites using languages like HTML, CSS, JavaScript, PHP, etc.
  2. Design, develop, test, debug, and deploy web applications.
  3. Communicate with designers and backend engineers on UI and backend specifications.
  4. Maintaining web responsiveness and handling traffic.
  5. Update the application frequently with new features and fix bugs.


2)How to reduce the loading time of the website?

The loading time lo a website can be reduced by the following techniques

  1. Compress the images and save them, to optimize them for screen resolution.
  2. Switch to asynchronous JavaScript.
  3. Minimize the redirects and caching on your website.


3)How to center an element vertically and horizontally using CSS?

You can center an element vertically and horizontally using CSS by adding the following styles, either inline, internally, or externally. 

<p style="align-items: center; justify-content: center;"></p>


4)What is CORS, and how does it work?

CORS - Cross-Origin Resource Sharing is a mechanism that enables many resources like JavaScript, fonts, styles, etc., on a web page. These resources are requested from another domain. This mechanism is supported in HTML5, which manages XMLHttpRequest access to a domain differently.

5)How do you style an entire webpage at once?

We can style an entire web page with the required styles once using the universal selectors. The universal selector applies the CSS styles to the entire UI to which the CSS file is connected. 

* {color: red; }


6)What is the difference between ‘==’ and ‘===’ in JavaScript?

The ‘==’ checks whether the values compared are equal, whereas ‘===’ checks whether the values are equal along with their types.

7)What is DOM?

DOM - Document Object Model is a language-dependent API for XML and HTML. It defines the logical structure of documents and how to access them. 

8)Describe different kinds of HTTP requests supported by RESTful Web services?

The following are the types of HTTP requests supported by RESTful Web services:

GET: It is used to fetch data or resources from the server 
POST: It sends the data to the server or creates a new resource.
PUT: This is similar to POST, but used for updating an existing resource.
DELETE: It is used to delete the resources from the server.
TRACE: It validates the content and network during an HTTP request.

9) What is SVG, and why is it used?

The SVG - Scalable Vector Graphics is used to display vector-based graphics. The SVG has the extreme quality of graphical content, so it can be used to display icons and images.

10)What is the scope in JavaScript?

The scope defines the accessibility of variables in a code. JavaScript has two types of scopes. 

  • Local scope - the variables can be accessed only inside the function or block.
  • Global scope - the variables can be accessed throughout the program.

Intermediate Web Developer Interview Questions

11)What is the use of Canvas in HTML?

Canvas is a tag that enables users to draw any shapes or drawings on the web page using JavaScript. The canvas can be defined using the <canvas> tag.

12)What are the types of CSS?

The CSS styles are of three types based on where we write them and access them. They are

  • Inline styles - written in HTML element line
  • Internal styles - written in the head section of the html file
  • External styles - written in separate file with extension .css.


13)What is AJAX?

AJAX is a technology used to create web applications. AJAX can include more responsiveness and creates faster applications. AJAX can be used to update the code, and only the modified part of the code is updated and rendered on the web page.

14)What is a media query in CSS?

The media queries ensure that the elements are displayed according to the screen size and the condition. Few elements will be disappeared from the website by using a media query. 

16)What are CSS box model contents?

The CSS box elements are

  • Padding - space around the content inside the border.
  • Border - a line separating the content.
  • Margin - space between two elements.

17)What is lazy loading?

The technique where the resources of content on a page load slowly when the user displays and interact with it.

18)What are the advantages of HTTP 2.0 over HTTP 1.1?

 The advantages of HTTP 2.0 over HTTP 1.1 are as follows: 

  • Higher loading speed
  • Automatic prioritization
  • Improvement of web positioning
  • Less broadband consumption
  • Immediate presentation

19)What is pagination, and why is it used?

The pagination is a sequence of pages on a website. All the pages with similar content cannot be shown at once. Pagination is used to present in a user-friendly way, where only a portion of the content is visible at a time, and we can go to other content by navigating to that page.

20)What are the new APIs provided by HTML 5 standard?

The HTML 5 provides the following new APIs

  • Media API
  • Text track API
  • Data transfer API
  • Application Cache API
  • Constraint Validation API
  • User Interaction
  • Command API
  • Constraint Validation API
  • History API

Web Development Interview Questions for Experienced

21)What are the IDEs used for web development?

The best IDEs used for web development are

  • Visual Studio Code
  • Atom
  • JSFiddle
  • Codepen
  • NetBeans
  • Sublime Text
  • IntelliJ Idea, etc.

22)What is hoisting in JavaScript?

The variables in JavaScript can be used even before they are declared. This is called hoisting. 

Example :

x = 2;
var x

23)What is the purpose of closures JavaScript?

A closure is a collection of functions and their lexical environment that is used to preserve variables from a function's outer scope in its inner scope. Each time a function is generated, closures are also created. Lexical scoping is a technique for determining a variable's scope based on where it appears in the source code.

24)What is an event loop in Node JS?

Node.js is able to do non-blocking I/O operations because of the event loop. Even though JavaScript supports a single-thread system, the event loop enables quick I/O operations.  It enables the operations by offloading tasks whenever possible to the system kernel. 

The runtime model of JavaScript is based on an event loop, which executes the code, gathers and processes events, and performs queued sub-tasks.

Also see, jQuery interview questions

25)what is a grid in Bootstrap?

The grid is a span of 12 columns which is similar to the CSS box. We can use the grid to place content, and the columns will re-arrange automatically if we don’t use all the 12 columns.

Grid Bootstrap

26)State difference between Local Storage and Cookies.

Some of the differences between local storage and cookies are as follows:

  • Generally, the capacity of the local storage is 5 to 10 MB whereas the capacity of the cookies is 4 KB.
     
  • While both clients and servers can read and write cookies, the client can only access local storage.
     
  • Local storage must be erased manually or by utilizing codes because it is not session-based. On the other hand, the duration of cookies varies depending on the settings for each tab and window.
     
  • All modern browsers, including those from the past, support cookies, but there are fewer ancient versions that support local storage.

27)Explain long polling.

The server can provide data to the client whenever it becomes available by using long polling, a variation of traditional polling. The simplest method of maintaining a connection with a server over time without using a specific protocol like WebSocket or Server-Sent Events is long polling.


It is a method for pushing data from the server to a client as quickly as possible. As a result, there is no need for the server to wait for a request from the client. Once it gets a request from the client, the server does not cut off the connection in long polling.

28)What are pseudo-classes?

A specific state of an element is specified by a pseudo-class. A selector that only includes items in a particular state is called a pseudo-class. You can apply styles based on changes in the state and outside factors using a pseudo-class. This implies that your design may respond to user input, such as an email address that isn't valid.


Selectors can have styles added to them using CSS pseudo-classes, but only in specific situations. In CSS, a pseudo class is created by following a selector with a colon (:), then a pseudo-class like "hover," "focus," or "active."

29)Explain W3C (World Wide Consortium).

An international group known as the W3C (World Wide Web Consortium) develops standards for the World Wide Web. The W3C's goal is to help the World Wide Web reach its full potential by creating protocols and rules that guarantee the Web's long-term expansion. 

Through the creation and promotion of web-based standards, the WC3 is dedicated to enhancing the web. The W3C's mission is to establish international technical standards and recommendations for web technology.

30)What are servlets?

Servlets are Java programs that run on the web or application servers. The servlets handle the request obtained from the web server, process the request, produce the response, then send it back to the webserver.

Frequently Asked Questions

What are 3 things a web developer is responsible for?

A web developer is responsible for Website design, development, and maintenance. Web developers are also responsible to use Javascript, HTML5, CSS3, PHP, and Java for creating websites.

How do I prepare for a web development interview?

Improve your skills in Javascript, HTML5, CSS3, PHP, and Java for creating websites. Make some good projects. A lot of companies hire web developers with good knowledge for good packages.

What basics should a web developer know?

You need to be familiar with HTML, CSS, and JavaScript to work as a web developer. It's also advised to become familiar with CSS and CSS frameworks. You can communicate with computer languages by developing these core web development abilities, which will provide the framework and reasoning for doing so.

Are web dev interviews hard?

Web development interviews vary in difficulty. They often include coding exercises, problem-solving, and discussions on web technologies. Preparation is key to facing challenges effectively.

How do I clear my web developer interview?

Clear your web developer interview by practicing coding problems, reviewing key concepts, demonstrating your projects, and showcasing problem-solving skills. Research the company and be ready to discuss your experiences.

Conclusion

We have discussed the most asked web developer interview questions in this article. Doing well in a web developer interview involves being good at coding, solving problems, and explaining things clearly. This set of interview questions and answers is here to help you prepare. Whether you're experienced or just starting, these questions cover important topics in web development. Remember, getting ready is really important.  

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