Introduction to Front end Developer Interview Questions and Answers
Do you know there are around 1 673 535,333 websites (leaving mobile application) globally (as of October 2018)? So, do you know, there has been a gigantic increase of 800% in the number of internet users (compared to last decade 2008).
Shocked!!! Well, this is just a glimpse of the title we are going to cover. But before, let’s take some understanding of it. Then, we will help our readers with a clue – “it is everywhere, on the internet”.
These stats just trifold the pressure for front-end developers across the globe. With every passing second, one or more websites come into existence, which is an ever-increasing demand. So, yes, we will discuss front-end developers today in our article.
What is Front ends Developer?
So, to start with, what exactly is a frontend developer? What did they do?
The front end means what appears in front of the users (yes, the websites). So, a front end developer implements the structure, design, behaviour, and animations related to every bit and piece that you see whenever you open a website or a mobile application.
If you are looking for a Front-end Developer job, you need to prepare for the 2023 Front end Developer Interview Questions. Every interview is indeed different as per the different job profiles. Here, we have prepared the important Front end Developer Interview Questions and Answers, which will help you succeed in your interview.
This 2023 article shall present 14 most important and frequently asked Front end Developer Interview questions. These questions are divided into two parts as follows:
Part 1 – Front end Developer Interview Questions (Basic)
This first part covers basic Front end Developer Interview Questions and Answers.
Q1. What skillset makes a complete front-end developer? Or what are the crucial skills needed for a front-end developer?
The crucial skills need for a front-end developer are as follow.
Apart from these, some more additional skills can enhance the profile:
- Understanding of cross-browser testing
- Content management systems like WordPress, Joomla, and Drupal
- Knowledge of SEO
Q2. Explain the layers present in a webpage. How CSS plays a role in it?
There are 3 kinds of layers on any web page.
- Content Layer
- Presentation Layer
- Behaviour Layer
The content layer is the information that a website holds. It comprises of the text details, facts, and the information part.
Q3. Tell me something about W3C?
W3C stands for World Wide Web Consortium, which is an international standard for the web. These people are responsible for standardizing the web and for making it accessible to all users.
The presentation layer will define how the content will appear in front of its users. One can also say it is the look and feel of the web page. Here is the role of CSS, a.k.a cascading style sheet is a way to control and present the presentation layer in a web document.
The behavioural layer involves real-time user interaction with the web page.
Q4. Mention some advantages of CSS?
The advantages of CSS are as follow:
- It saves time
- Helps in fast page loading
- Easy maintenance
- Superior to HTML style
- Multiple device compatibility
- Global standards for web
- Offline browsing
- Platform independence
Q5. As a developer, what ways are applied to reduce the load time of any given website?
Some crucial things we keep into consideration are:
- Enable a proper browser caching
- Optimize the image files
- Minimize the HTTP requests
- Reduce redirects
Q6. As a developer, what ways will you think is crucial to reduce the web application load time?
There are a good number of ways available in doing this; these can reduce the complexity.
- Browser caching
- By optimizing the image files
- Resource minify (remove unnecessary characters from source code)
- Minimize HTTP request
By using this syntax:
var myArray = [ [  ] ];
Part 2 – Front end Developer Interview Questions (Advanced)
Let us now have a look at the advanced Front end Developer Interview Questions.
Q8. What would be the result of 9+6+”3”?
The o/p will be 153.
Explanation: Here, 9 and 6 are data types (integers), so they will be added numerically. Since 3 is a string, the result would be concatenated and become as 9+6 = 15, and 3 come together to form 153 as output.
Q9. Explain the CSS box model?
The Box model helps provide a more structured way to space elements in relation to each other for a web page.
The box model has several components in it like:
Q10. What is a CSS pre-processor? Why do we use them?
Pre-processor is used for code conversion. The preprocessed languages like SASS and LESS are converted to a more formal CSS format.
Reasons for using them are:
- Ability to define variables
- Ability to use the nested syntax
- Ability to create and use mixins (functions)
- Use of mathematical and operational functions
Q11. Name some of the new features present in HTML5 and are missing in HTML?
Some new features in HTML5 are:
- DOCTYPE declaration
- Section tag (<section/. …</section>)
- Header and Footer tag
- Flgcaption tag
Q12. Tell me the components of a CSS style?
The CSS style is made up of three things.
- Selector: A selector is an HTML tag where styles can be applied. A selector tag can be anything of <h1> or <table>
- Property: This is an attribute of the HTML tag. This property can be anything like colours, borders, shades etc. The HTML attributes are converted into CSS property.
- Value: A value is always assigned to any defined properties.
Q13. Can you explain ways to apply CSS styles to a web page?
The first way to do it is by using the inline style attributes on an element.
<p style=”color: maroon; “></p>
One can use a <style> block in the <head> section of the HTML.
Lastly, using the <link> tag while loading the external CSS file.
The 3 main ways to do this is:
- parseInt ()
- parseFloat ()
This has been a guide to Front end Developer Interview Questions and Answers. Here we have listed the most useful 14 interview sets of questions so that the jobseeker can crack the interview with ease. You may also look at the following articles to learn more –
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