Since Full Stack Development has lifted off to be a market worth billions of Dollars, it should come as no surprise to you that this creates a vast amount of job openings across the world. As mentioned above, with this comes a lot of competition making the interviews a little challenging as well. But nothing to worry, this Top 50 Web Development Interview Questions blog is carefully curated by handpicking questions, having the highest probability of occurrence in an interview. Study these diligently and understand how you should approach the questions and answer them in an effective manner.

Q1. What is the difference between SOAP and REST?
Q2. What is the use of a namespace in Web Development?
Q3. What are the newly introduced input types in HTML5?
Q4. What are the form elements that support media content in HTML5?
Q5. What is SVG and why is it used?
Q6. What is the use of Canvas in HTML?
Q7. What is the difference between Canvas and SVG?
Q8. How can page loading time be reduced?
Q9. What is the use of CORS?
Q10. What is the difference between localStorage and sessionStorage objects?

This Top Web Development Interview Questions blog is divided into three parts:
1. Basic

2. Intermediate

3. Advanced

Check out our Web Developer Interview Questions on YouTube designed especially for beginners:

Top 50 Web Development Interview Questions

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Basic Interview Questions

1. What is the difference between SOAP and REST?

A Web Development protocol An architectural platform
Works with XML Works with XML, HTML, and plain text
SOAP cannot use REST REST can make use of SOAP

2. What is the use of a namespace in Web Development?

A namespace is a simple global object that is used to hold methods, properties, and other objects in them. It adds ease of use via modularity, thereby providing users with the ability to reuse the code and avoid naming conflicts.

3. What are the newly introduced input types in HTML5?

HTML5 has had multiple revamps in the past years, and the addition of input types has made it very easy to work with. Some of these input types are as follows:

  • color
  • date
  • Datetime-local
  • email
  • month
  • number range

4. What are the form elements that support media content in HTML5?

There are five main elements in HTML5 that support media:

  • <audio>
  • <video>
  • <source>
  • <embed>
  • <track>

5. What is SVG and why is it used?

SVG stands for Scalable Vector Graphics. It is used to display vector-based graphics over the web. The graphical content it can render is based on an XML format. With SVG, the graphical content is of superior quality thereby providing the user with the ability to furnish high-quality images.

6. What is the use of Canvas in HTML?

Canvas was added onto HTML5 to give users the ability to draw graphics on the go, using JavaScript. There are a variety of methods in <canvas> to allow for the drawing of paths, circles, boxes, images, and more.

Next up on this top Web Developer interview questions and answers, let us understand the difference between canvas and SVG.

7. What is the difference between Canvas and SVG?

Canvas SVG
Resolution dependant Resolution independent
Does not support event handlers Supports event handlers
Works well for small-scale rendering applications Performs better for large-scale rendering applications

8. How can page loading time be reduced?

There are many factors that affect the page loading time of a website. However, some methods can be implemented to reduce it drastically. They are given below:

  • Reduction in the image size
  • Removal of unnecessary widgets
  • HTTP compression
  • Reduction in lookups
  • Minimal redirection and caching

9. What is the use of CORS?

CORS stands for Cross-origin Resource Sharing. It is a mechanism that allows a variety of resources to be requested at a time from a domain that is outside the current request domain.

The next web application interview question comprises an important difference. Check it out below.


Certification in Full Stack Web Development

10. What is the difference between localStorage and sessionStorage objects?

localStorage sessionStorage
No expiry is there for stored data The object is valid for only a single session
Data is not deleted upon the closure of the window The object is immediately deleted upon closing the window

11. What are some of the new features that are introduced in CSS3?

CSS3 has brought about a lot of changes, making the overall framework more user-friendly and powerful. Some of the features that were added and are very popularly used now are:

  • Rounded corners
  • Animation
  • Custom layout
  • Media queries

12. What is responsive web design (RWD) in HTML and CSS?

Responsive web design is a concept that is used to create web pages that can scale across multiple resolutions without any loss of information or screen tearing.

It automatically adjusts the structure of the web page based on the device it is viewed on to provide optimal viewing experience.

13. What are some of the types of CSS that are used?

There are three main types of CSS present:

  • Inline CSS: Supports the addition of CSS inline, alongside HTML elements
  • External CSS: Used to import an external CSS file to the HTML document
  • Embedded CSS: Used to add CSS styles by making use of the <style> attribute

14. What is the use of a selector in CSS?

A CSS selector is used with a rule in the inline elements, which require styling. With the help of selectors, it is easy to find and select HTML elements based on factors, such as name, ID, attribute, etc.

15. Can you give an example of using an ID selector in CSS?

The ID selector is used in CSS to point to a target element for usage. It is denoted in the following example:

#example {padding: 20px;}
<p id="SelectorExample">

16. What is the use of grouping in CSS3?

Grouping is used in CSS3 to give users the ability to reuse and apply the same CSS style element to multiple HTML entities, using just one single declaration statement.

A simple example of grouping is as shown below:

#grouped g, ul { padding-top: 20px; margin: 1; }

17. What is the use of a class selector in CSS?

Class selectors in CSS begin with a “.” (period) key and are followed by the name of the class. It is used to select a statement and modify the style of that element in the corresponding part of the HTML tag.

Consider the following example:

.exampleclass {font-family: TimesNewRomanl; font-size: 20; background: red;}
<div class="sampleclass">

Next up on these web technologies interview questions, let us understand a little about the use of Webkit.

18. What is the use of Webkit in CSS3?

Webkit is an important software component in CSS that allows for the easy rendering of HTML and CSS elements in a variety of browsers, such as Chrome, Firefox, and Safari.

There are many engines for browsers such as:

  • Gecko for Mozilla
  • Presto for Opera
  • Edge for Internet Explorer

19. What are the uses of child selectors in CSS?

Child selectors are primarily used in CSS to look up for the ‘child’ component of an element in CSS.

Consider an example where the <ul> tag is used in a paragraph. Then, the ‘ul’ tag becomes a child of the paragraph element. To implement this in CSS, the following syntax is used:

p > ul { font-size:20px; }

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Next up on this top Web Developer interview questions and answers blog, let us take a look at the intermediate set of questions.

Intermediate Interview Questions

20. How does CSS3 help in implementing rounded borders easily?

CSS3 has the <border-radius> property that allows elements to be created with nice-looking rounded corners. This can easily be applied to all four sides or as per requirement.

The <border-radius> property has four attributes for four corners:

  • <border-top-left-radius>
  • <border-top-right-radius>
  • <border-bottom-left-radius>
  • <border-bottom-right-radius>

21. What is pagination? How can pagination be implemented?

Pagination is a simple sequence of pages in a website. These pages are interconnected and have similar content to display to users.

A simple example is the page selector on an e-commerce site that allows the users to browse through the products present on multiple pages rather than scrolling up and down on one single page.

It can easily be implemented in CSS3 using the following code:

<div class="main_container">
<div class="pagination">
<li><a href="#"></a></li>
<li><a href="#"></a></li>
<li class="active"><a href="#"></a></li>
<li><a href="#"></a></li>

22. What are the components of the CSS box model?

The CSS box model is used to represent an entity that encloses all of the HTML content into a box or a button element.

There are four components:

  1. Border: Denotes the padding and content around the border
  2. Content: Refers to the actual content to be displayed
  3. Margin: Refers to the top layer of the box element
  4. Padding: Defines the empty space around the element

23. What are some of the properties of transitions in CSS3?

Transitions in CSS3 are easy to use, and they provide users with rapid and efficient animation effects.

There are four main properties that are present in transitions:

  • transition-delay
  • transition-duration
  • transition-property
  • transition-timing-function

24. What is the use of pseudo-classes in CSS?

Pseudo-classes are used as a popular technique in CSS to change the style of an element when this element changes its state.

There are numerous examples of when you use a pseudo-class:

  • For the style change when the mouse moves over the element
  • For out-of-focus animations
  • For providing styles for external links

We have to understand media queries in the next set of interview questions for web developers. Check it out.

25. What is the use of media queries in CSS3?

Media queries are used to define styles in CSS, which are responsive based on a variety of shapes and sizes of the viewing window.

They are used to adjust the following entities:

  • Height
  • Width
  • Viewport
  • Resolution
  • Orientation

If you are looking forward to becoming proficient in Web Development, make sure to check out Intellipaat’s latest offerings for Full Stack Developer Course.

26. Why is float used in CSS?

Float is a popular property in CSS to control the layout and position of an element on a web page.

Any element can be placed on the web page as per requirement. Consider the following example:

div  { float: right; }

Here, the contents of div will be placed on the right side of the screen.

27. What is z-index in CSS?

Z-index is a property in CSS that is used to define the order of elements on a web page. It works on the basis of order indices, where a higher-order element will appear before a lower-order element.

It only applies to elements that are positioned, i.e., those elements having the position attribute compulsorily.

Consider the following example:

div {
position: fixed;
left: 15px;
top: 20px;
z-index: -1;

28. Why are external style sheets preferred?

External style sheets provide an ample amount of advantages to developers. Some of the benefits are as follows:

  • Classes can be reused any number of times.
  • They allow for the style control of multiple documents through a single file.
  • Selectors and grouping can be used to apply styles easily.

29. What is the meaning of long polling in Web Development?

Long polling is a development pattern that is used to emulate a data push operation from a server to a client machine.

When long polling is operational, the client sends in a request to the server, and the data is pushed. The connection will timeout only when the data is sent to the client or after the timeout criteria is met.

30. What are some of the Web Development technologies that you know?

This question is very common in a Web Development interview. Answer it based on your learning, experience, and proficiency in this field. However, a good Web Developer will have profound working skills in any of the following technologies:

  • HTML
  • CSS
  • JavaScript
  • SQL
  • Python
  • PHP

31. What is the difference between cookies and local storage?

Cookies Local Storage
Cookie data is accessible for both the client and the server Data is stored only on the local browser in the client-side machine
Cookies have an expiry time, and data gets deleted post expiration There is no expiry in local storage unless the data is manually deleted

In the next set of interview questions for web developers, we have a very important question regarding HTML and XHTML.

32. What is the difference between XHTML and HTML?

Tags should be in lowercase It is not case sensitive
Tags should be closed once opened Open-ended tags can be used
Attributes must be enclosed in double quotes Attributes can be used without quotation marks

33. What are the various data types present in JavaScript?

JavaScript supports the following data types:

  • Boolean
  • Number
  • Object
  • Undefined
  • Null
  • String
  • Function

34. How can styles or classes be changed in elements using JavaScript?

JavaScript can be used to easily modify classes and styles in an element by making use of the following syntax:

Modify styles: document.getElementById(“input”).style.fontSize = “10”;
Modify class: document.getElementById(“button”).className = “classname”;

Next up on this top Web Development interview questions and answers blog, let us take a look at the advanced set of questions.

Advanced Interview Questions

The following will cover the senior web developer interview questions but I suggest you go through them even if you are a fresher or an intermediate web developer candidate.


Become a Full Stack Web Developer

35. What are the types of popup boxes present in JavaScript?

There are three types of dialog boxes, which are used in JavaScript:

  • Alert: Presents users with a message and an ‘Ok’ button
  • Confirm: Gives the users a window with ‘Ok’ and ‘Cancel’ buttons
  • Prompt: Shows the user input, alongside ‘Ok’ and ‘Cancel’ buttons

36. What is the difference between and ?

The <window.onload> event is not called until a page is completely loaded with the entire styling from CSS and images. The event does add a bit of delay when rendering a web page.

With the <onDocumentReady> event, it will wait only till the DOM is initialized and will begin the event action. This ensures to reduce any delays in actions.

37. How is type conversion handled in JavaScript?

JavaScript supports automatic type conversion. Since it is weakly typed, you can pass a function as an argument into another function easily.

This ensures that there are no errors or data type-associated warnings as values get converted to the required data type automatically.

38. What is the meaning of the scope of a variable in JavaScript?

Scope refers to the accessibility of functions and underlying variables in the running environment. There are two scopes supported in JavaScript:

  • Local scope: Here, values and functions declared inside the same function function can only be accessed within that function and not outside it. Consider the following example:
// Code present here cannot use localVariable
function myFunction() {
var localVariable = "This is a local variable";
// Code present here can use localVariable
  • Global scope: If a variable is declared as global, it can be accessed from anywhere in the application. Consider the following example:
var globalVariable = "This is a Global variable";
// Code present here can use globalVariable
function myFunction() {
// Code present here can also use globalVariable

39. How are comments used in JavaScript?

JavaScript supports two types of comment insertion in the code. Single-line comments and multi-line comments.

  • Single-line comment: “//” is used for single-line comment insertion


//This is a single-line comment

  • Multi-line comment: “/* */” is used to add multi-line comments


/* This
is a

Coming to the next set of interview questions for web developers, here is a common question for JavaScript.

40. What are undefined and undeclared variables in JavaScript?

Variables that have been declared already but not initialized are known as undefined variables.

On the other hand, if a variable is being used in a program without being declared, then it is considered as an undeclared variable.

Consider the following example:

var undefVar;
alert(undefVar); // undefined variable
alert(notDeclared); // accessing an undeclared variable

41. What is the method used to submit forms in JavaScript?

Forms can be submitted easily in JavaScript by calling the following method:


Here, the ‘0’ denotes the index of the form.

42. Why is keyword used a lot in JavaScript?

The <this> keyword is used to access the current object present in a program. This object resides inside a method, and the keyword is used for referencing the corresponding variable or object.

43. What is the use of the ‘defer’ attribute in JavaScript?

The <defer> attribute is used as a boolean type attribute. It is used to delay the execution of the JavaScript code on a web page until the parser completely loads and initializes the page.


<script src="/example.js" defer></script>

44. How can you prioritize SEO, maintainability, performance, and security in a web application?

This is a commonly asked question in a Web Development interview. Here, the interviewer is trying to assess your understanding of the working environment in the firm you’ve applied for.

If it is a large firm, then security will get higher priority over SEO. Whereas, if it is a publication firm, SEO gets the preference. A little groundwork about the company should help you answer this question.

The next web developer interview question we will look at is regarding jQuery. Check it out.

45. What is the result if a jQuery Event Handler returns false?

If the jQuery Event Handler returns a boolean false value, it simply means that the event will not execute further and will halt the execution for the particular action it is associated with.

46. What is the use of the each() function in jQuery?

The each() function in jQuery is used to iterate over a set of elements. A function can be passed to the each() method. This will result in the execution of each of the events for which the object has been called.

47. What is pair programming?

Pair programming is a scenario where you will be working closely with a colleague on the project, and this is done to help solve the problems at hand. If the development scenario is fast-paced, Agile development might not work efficiently. The interviewer asks this question to see if you can work with other people easily and effectively.

48. What is the use of the $() function in jQuery?

The $() function is used as a wrapper to wrap objects into their jQuery counterparts. This is done to give users the ability to call any method that is defined for the jQuery object.

Note: Selectors can also be passed to the $() function, resulting in the output of a jQuery object that contains matched DOM elements.

49. What are the advantages of using a content delivery network (CDN) in jQuery?

CDNs are widely used in jQuery as they offer an ample number of advantages for users.

  • CDNs cause a significant reduction in the load for the server.
  • They provide large amounts of savings in the bandwidth.
  • jQuery frameworks load faster due to optimizations.
  • CDNs have a caching ability that adds to quicker load times.

50. What are the types of CDNs supported in jQuery?

There are two widely used CDNs with jQuery:

  • Microsoft: Used to load from jQuery AJAX CDN
  • Google: Used to load jQuery from the Google libraries API

If you are looking forward to becoming proficient in Web Development, make sure to check out Intellipaat’s latest offerings for Web Development Online Course. With these programs, you can become an expert in Web Development and earn a course certificate as well.

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