Embarking on a career in Web Development is an exciting journey. And, the gateway often involves facing a series of interviews specifically designed to assess your skills, knowledge, and problem-solving abilities.

As of 2023, the vast field of web development promises some exciting career opportunities for aspiring web developers.

Did you know that by the end of 2032, the employment rate in this field will witness a drastic increase, amounting to as much as 16%? Compared to most other professions, this figure is significantly higher. 

On that note, mentioned below is a detailed list highlighting some of the most commonly asked Web Developer Interview questions.

Must-prepare Web Developer Interview Questions

Q1. Can you explain some of the roles and responsibilities of a web developer?

The primary responsibilities of a web developer include:

• Building products using HTML, CSS, PHP, and other relevant coding languages
• Collaborating with other team members to ensure the smooth running of any web application
• Identifying bugs and resolving the same, as and when necessary
• Testing and debugging web applications
• Monitoring web traffic
• Keeping up to date with the latest advancements in web development

Q2. Can you explain the difference between HTML and HTML5?

HTML is the standard markup language that is used to create the structures of web pages. It defines the elements and attributes that make up the content of a web page. HTML5, on the other hand, is an updated version of HTML that comes alongside a wide range of features and improvements. Its ultimate goal is to enhance the language to support the latest multimedia, provide better structure, and improve the overall user experience.

Q3. How can you speed up page loading?

Some of the most effective ways to improve page loading speed include:

• Decreasing the image size
• Reducing redirects
• Getting rid of any unwanted widgets 
• Minimising lookups

Q4. Can you shed some light on pair programming?

Pair programming, also sometimes called pairing, refers to a specific process wherein two programmers work together at a single workstation. The first person is designated with the task of writing codes. We refer to them as drivers. The second person is responsible for navigating and monitoring each line of code. We call them navigators. 

Q5. What do we mean by HTML5 web storage?

HTML5 web storage provides a way for web pages to store named key/value pairs locally within a user’s browser. It is widely used, especially for client-side data storage in web applications, thereby offering a more efficient and convenient alternative to traditional cookies.

Q6. Can you explain type coercion in JavaScript?

Simply put, type coercion can be described as the process of converting values from one data type to another. It can either be done automatically or implicitly. By using the same, we can convert a number to a string or a Boolean to a number. 

Q7. Can you name some types of HTTP requests supported by RESTful Web services?

GET, POST, PUT, TRACE, and DELETE are some of the many HTTP request types in RESTful web services. Please note that each of these types serves different specific purposes. 

Q8. Can you name any one difference between SVG (Scalable Vector Graphics) and Canvas?

SVG uses XML-based markup to describe vector graphics. They are typically resolution-independent and can be scaled without losing quality. Canvas, on the other hand, is a bitmap-based system where you draw directly on a pixel grid. It is more suitable for interactive and dynamic graphics.

Q9. Can you name some of the APIs offered by HTML5?

History API, Text Track, Media API, Command API, and User Interaction are a few examples of APIs incorporated by HTML5.

Q10. Can you state the definition of NPM (Node Package Manager)?

NPM or Node Package Manager can be described as a toolbox that enables developers to discover, share, and use code, thereby making it easier for them to handle dependencies in projects. From installing packages to managing versions, NPM can be utilised for a variety of tasks.

Q11. Can you name the different pop-up boxes that are available in JavaScript?

Pop-up boxes are primarily used by JavaScript to display notifications and messages to users. They can be categorised into three main types, namely alert boxes, confirm boxes, and prompt boxes. 

Q12. What do we mean by Scope in JavaScript?

In JavaScript, scope refers to the current context of the code. There are mainly two types of scope, namely local and global. The former refers to those variables that are declared within a block, whereas the latter is used to define those variables outside of a block. 

Q13. What is W3C?

The World Wide Web Consortium, also commonly referred to as W3C, is an international organisation that helps to develop web standards. It sets the guidelines and specifications that help browsers and users have a consistent experience across different platforms. 

Q14. What do we mean by CSS selectors? Can you name a few?

CSS selectors enable developers to pinpoint which HTML elements they wish to style. Some of the most commonly used CSS selectors include Class Selector, ID Selector, Child Selector or Combinator, and Attribute Selector.

Q15. Describe long polling. 

Long polling can be described as a process used in web development to achieve near real-time communication between a client and a server. Contrary to traditional polling, wherein clients have to repeatedly ask the server if there are updates, this approach allows for real-time updates without the need for constant polling. 

Conclusion

By preparing for these above-mentioned web developer interview questions, you can better position yourself as a suitable candidate for your next interview session. As the web development landscape continues to evolve, staying informed about the latest technologies and trends will give you that much-needed competitive edge. The key is to remember not just to display your technical expertise but also your problem-solving skills and adaptability to navigate the dynamic realm of web development. 

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