If you're looking for a job as a Front-End Developer, have you ever wondered what questions an employer might ask? In this article,

We've compiled some of the most commonly asked Front-End Developer Interview Questions and answered them with important information on how to get hired.

HTML Interview Questions and Answers

1. What are tags in HTML? 

HTML tags are like keywords that define how a web browser will format and display the content. With the help of tags, a web browser can distinguish between an HTML content and a simple content.

HTML tags contain three main parts: an opening tag, content, and closing tag. 

2. What is Semantic HTML? 

Semantic HTML is a type of HTML that helps to define the meaning of tags. This makes it easier for web browsers to interpret the code.

Additionally, semantic HTML saves you time by automating some of the processes of coding.

Semantic Elements Example:

• <article>
• <footer>
• <header>
• <figure>
• <time>
• <nav>
• <section>
• <details> 

3. Explain DOCTYPE in HTML. 

All HTML documents must start with a <!DOCTYPE> declaration. The declaration is not an HTML tag. It is "information" to the browser about what document type to expect. 

4. How you can add a stylesheet to the HTML file?

There are 3 ways to include CSS in the webpage.

1. External CSS
2. Internal CSS
3. Inline CSS 

5. What is the difference between Local Storage, Session Storage & Cookies? 

1. Local Storage - Local Storage allows to store the data without expiry limits.
2. Session Storage - Session Storage allows to store the data till window is opened.
3. Cookies - Cookies allow to store data within client-server. 

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CSS Interview Questions and Answers

1. What is the latest version of CSS? 

CSS basically consists of many drafts for upcoming Standards. CSS3 is the latest version of CSS. It helps you to control the styling of the website. 

2. Explain the new features in CSS3. 

CSS basically consists of many drafts for upcoming Standards. CSS3 includes some new features like New Selectors, CSS Variables and functions, Gradients, Opacity, Transitions, Transformation, Animations, FlexBox, Grid, and Media Queries. 

3. Tell me the difference between inline-block, block, and inline 

1. block-level element starts with their own new line and takes space for an entire row.

Example - <div>, <p>

2. inline-block begins on the same line, except they have padding and margins on all 4 sides.

3. Inline also begins on the same line itself and it has content or tags before or after it.

Example - <a>, <span> 

4. What is z-index and why it is used? 

z-index in CSS is a property that is used to define the order of elements on the z-axis. It defines the order of overlapping HTML elements.

Elements with a higher index will be placed on top of elements containing a lower index. 

5. What is the difference between padding and margin? 

1. Margin - Margin defines the space around the element's border.

2. Padding - Padding defines the space between the element's border. 

JavaScript Interview Questions

1. What is the difference between let, const, and var? 

In JavaScript, there are three different types of variables: let const and var.

Let is a type of variable that allows you to declare a variable within a block of code. This means that the variable will be local to the block and will not be shared with any other blocks.

const is like a let but that can't change its value once it's been set.

var allows you to declare a global variable that will be accessible from anywhere in the code. 

2. What are the different types of data types in JavaScript? 

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

3. What are the different methods of Array available in JavaScript?

• push()
• pop()
• join()
• length
• concat()
• join()
• at()
• filter()
• find()
• map()
• includes()
• indexOf()
• isArray()
• slice()
• values() 

4. What is the use of void(0) in JavaScript? 

void(0) is a special keyword in JavaScript that's used to declare a function that doesn't return any value. When you use void(0), it tells the interpreter that this function should not return anything.

When you don't want a link to navigate to another page or reload a page. You can use javascript: void(0) to run code that doesn't change the current page. 

5. What is the difference between localStorage and sessionStorage()?

localStorage is a storage mechanism that is saved in the browser's local storage. It stores data for the current website and can be accessed later and multiple sessions.

sessionStorage is a different storage mechanism that is saved in the browser's session storage. It stores data only for the current website session, which means that it won't be accessible after closing the browser or the next session. 

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