If you are preparing for a Web Developer Interview this article will help you. Here in this article, we will share about Best Web Developer Interview Questions and Answers.

Many people believe that the interviews for web developer positions are difficult but it’s this is not the case always. These are the best 20 internet developers’ interview questions and their answers that can help you successfully pass the interview.

Web Developers Interview Question and Answers

Here you can check our Best Web Developer Interview Questions & Answers:

Let me know which programming languages web developers should be aware of?

A professional web developer must be aware of:

• CSS
• PHP/Ruby/Python
• JQuery
• HTML
• SQL
• JavaScript

What is CORS? How does it work?

Cross-Origin Resource Sharing is a device that allows multiple pages’ resources to request information from an extra domain that is not the one where the resource came from. It is a tool supported by HTML5 which manages XmlHttpRequest’s admission to a specific domain.

Give the ways to reduce speed?

A few strategies that could aid in reducing page load times:

• Reduce the size of images
• Eliminate unneeded widgets
• Reduce lookups
• HTTP Compression
• Caching
• Reduce redirects
• Applying CSS on top, and script references at the bottom or within external files

List the latest APIs that are provided by HTML 5 standards?

HTML 5 is accompanied by several new APIs:

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

What’s Webpack?

Webpack is a fixed bundler of modules for JavaScript. It’s a building tool that is used to group JavaScript files to be used within a browser. It puts the bundles of assets like fonts, images, codes, and other files into the form of a dependency graph.

It lets you use the requirement() within your source code to look at local files, for example, images, and then decide what they’ll be processed when you create the final Javascript bundle.

What is What is DOM?

Document Object Model Document Object Model is a cross-platform programming border that represents HTML as well as XML documents as objects and nodes. It is the basis for the logical structure of records and how documents are used and accessed. DOM allows programmers to create edit, delete, or modify the structure, style, and content. When an application is displayed in a browser, the content of the document should be preserved as well as the information about its method.

What is NPM?

NPM is a reference to Node Package Manager. It’s a wrap-up tool for JavaScript. NPM places JavaScript modules in the right place to make it easier for nodes to locate them. It also helps to manage dependency conflicts. It can be used to issue the appropriate node programs, to discover, install and extend node-related programs.

How do you know the best way to integrate Javascript in HTML?

The best way to incorporate Javascript in your HTML is to use inline event handlers or code.

What are the main duties of a web designer?

The most important responsibilities for web developers include:

• Create, test, design, and deploy web-based apps
• Uploading websites onto servers and then registering them with search engines
• Repair bugs, troubleshoot issues, and fix issues
• Test and debug each web application
• Design appropriate code structures that will accomplish specific tasks

What’s the meaning of type coercion within javascript?

Type coercion refers to the conversion of an amount from one type to another type with similar content. If the effectiveness of the implied exchange isn’t certain, the constructors of a particular data kind are able in order to transform any data type into the appropriate data type.

How do you use the CSS file on your web pages?

You can reference the .CSS file on the website by using the tag. It should be used between tags. For instance,

What are the new APIs offered by the HTML5 standards?

A few of them include:

• Command API
• Media API
• Text track API
• Interaction with Users
• History API

What is the progressive rendering of HTML?

Progressive Rendering is an approach that allows you to can continuously update tiny portions of the website and then stream it to the client in small chunks without having to wait for the whole page to render. 

This means that as soon as you start displaying the vital content on your server, you can stream it to the client, without having to wait for non-essential content to render.

Define the non-functional and functional needs?

Functional requirements specify the exact function of the system. it defines what the system should or should not perform. In contrast, non-functional requirements determine how the system must perform it. 

They define the kind of system with regard to accessibility as well as dependability capability and maintainability. and security. Non-functional requirements describe the system’s behavior characteristics, features, and general features that impact users’ experience.

In HTML, which tag could be used to create an input control for the text that is multi-line?

For control of multi-line text contributions, you can utilize “text area tag” “text area tag”.

What’s an ETag and what is its purpose?

The ETag is a definite identify that is provided by a webserver to an exact version of a resource that is established at the URL. An ETag is a part of HTTP which is the protocol for web browsing. World Wide Web and when the server is able to read the ETag in response to a request from a client it can decide which file to drive or inform the client to make use of the local copy.

What do you think of CSS selectors? What are they?

CSS selectors are just a tiny fraction of a CSS ruleset. Through CSS selectors, you are able to find HTML elements that you wish to explore. They pick HTML elements based on their ID, class, type, and quality, among others.

There are a variety of different types of CSS selectors.

• Id Selector
• Attribute selectors
• Class Selector
• Pseudo-Classes
• Universal Selector
• Element Selector
• Pseudo-Elements
• Combinator

What is with HTML5 Web Storage?

HTML5 web storage allows web-based applications to store data locally in the browser of the user. Data is saved in name-pairs and web pages can only access information stored by it. There are two types of web storage that can save data locally:

• Sessions storage This storage holds data only for a single session. The data will be removed from the browser when the browser of the user closes and the session will be deleted.
• Local storage is a way to store data without a running date. Once the data is saved locally will remain there, even if the browser is closed and then reopened.

What is the distinction between adaptive and responsive design?

The responsive design is a quality of flexibility. It is able to adapt to the dimensions of the display and gives the most optimal viewing experience for the website in terms of the type of device that is being used to view it. In contrast, the adaptive design utilizes static designs rather than flexible layouts. Its design is based on breakpoints that don’t react until they are loaded initially.

What is Cross-Site Scripting?

The cross-site scripting technique is a security method that permits an attacker to insert malicious client-side code on a site. If the users accidentally click on links that are not trusted then the information about cookies is given to attackers, allowing them to override contact controls.

Here are the below interview questions and solutions for web developer positions. Candidates must go through it and do a search to find more answers to the interview.