16 essential front end web developer interview questions (pdf download)

Front End Web Developer Interview Questions Pdf Interviews are always nerve-wracking, but they’re particularly difficult when you’re applying to become a front end web developer, because not only do you need to prove that you have the necessary skills, but also that you know how to communicate them well. These 16 essential front end web developer interview questions can help you show off your skills and put your best foot forward in the job interview. The answers are also included in the document, so you can prepare ahead of time by practicing responding to these questions with your friends and co-workers!

1) What are the three pillars of front-end development?

The three pillars of front-end development are HTML, CSS, and JavaScript. HTML is used to structure content and present information in a way that can be read by both humans and computers. CSS is used to style the appearance of HTML elements by controlling their layout, color, font size, borders, backgrounds and more. In contrast to HTML and CSS which modify the presentation of information on a website, JavaScript is used to provide interactivity on the site.

2) What is a CDN and why would you use one?

A content delivery network (CDN) is a globally distributed system of servers that deliver content on behalf of other websites and applications.
A CDN is used to deliver high volumes of content quickly to users around the world. The most common type of content delivered by a CDN is: images, videos, audio files, software libraries, HTML pages, and similar resources.

3) What is your favorite CSS property to use?

In my opinion, the best CSS property to use is text-align. The text-align property allows you to define how lines of text are aligned vertically and horizontally in their container. This is especially useful when using responsive design or liquid layouts that change the width of a container. It also has quite a few possible values for alignment including left, center, right, and justify which can be used depending on your preference.

4) How do you center an element horizontally and vertically?

This may seem like a simple question, but it is asked to see if you understand how margins, padding, and positioning work. The easiest way to center an element vertically is to use margin: auto; The easiest way to center an element horizontally is to use text-align: center; You can also use display: table-cell or display: inline-block; Or you can do both by using display: table.

5) What is a pseudo-element?

A pseudo-element is a special kind of CSS selector that lets you style a portion of an element, like the first line of an HTML paragraph.
For example, if I wanted to change the color of the first line in this paragraph, I could do so with a pseudo-element by adding the following code: s:first-line

6) What are the benefits of using a CSS preprocessor?

There are a number of benefits to using a CSS preprocessor. By using a preprocessor, you have the ability to reduce your code and write cleaner code. This will not only help you better understand the code, but it will also make the code easier to maintain, which is one of the biggest benefits. A CSS preprocessor can also help in keeping your design consistent across browsers. Another benefit is that there are many options when it comes to selecting a CSS preprocessor, so you can find one that best suits your needs and skillset.

7) What is the difference between an ID and a class?

There are many differences between an ID and a class. A class is used for inheritance, which means that you can use it to create objects with the same properties but different functionality. An ID is used to identify one element from another. The most common use for IDs is in CSS so that you can target specific elements on your page.

8) What are the different types of selectors?

There are four different types of selectors for CSS. The type of selector will depend on the level of specificity you want to achieve. These are called: ID Selector, Class Selector, Type Selector and Universal Selector.

9) What are the different units of measurement in CSS?

Different units of measure in CSS are: pixels, ems, and percent. A pixel is the smallest unit of measure available in CSS. When you specify a length as a pixel value, the browser will render this length as an absolute size. An em is another unit of measure in CSS. One em can be equal to either the current font size or any inherited font size. Percentages are also supported by CSS, but they represent relative lengths onscreen and can be expressed as either a decimal or percentage sign followed by a number from 0-100%.

10) What are the different values for the display property?

The display property is used to control the visibility of an element on a page. There are four different values for the display property: block, inline, none and list-item.
Block – The element will take up all available space it can in its parent container. To make an element take up all available space in its parent container, you must set the width and height properties to auto.
Inline – The element will not take up any additional horizontal space in its parent container but will still occupy vertical space according to its height or width properties. An example of a display value is none. By default, all elements are inline elements and changing this value requires some extra work like setting both display and visibility values to override inline defaults.

11) What are the different values for the position property?

A media query is a simple statement that can be embedded into the CSS of a web page, or inside another style sheet, in order to change how it displays on different devices. This is an example of one: @media screen and (min-width: 600px)
This will show up as follows in the code editor: @media screen and (min-width: 600px)

12) What are the different values for the float property?

The float property is used to tell the browser how to deal with an element next to it. The values for the float property include: left, right, none, top, bottom, and inherit.
The value of ‘left’ tells the browser that the element should float to the left. The value of ‘right’ tells the browser that the element should float to the right. value of ‘none’ tells the browser not to float this element at all. value of ‘top’ tells the browser that this element should float above everything else on a page. value of ‘bottom’ tells the browser that this element should be below everything else on a page. And finally, inherit will place this property in line with its parent’s settings.

13) What is a media query?

A media query is a CSS-specific language structure that allows the designer to change the layout of the website, depending on device and screen size. A media query is usually placed within a set of style rules which are enclosed by @media .
Media queries help designers create responsive sites that can resize themselves to fit any screen size, from desktop computer screens to mobile phones.
To learn more about how to build responsive websites, read our eBook Creating Responsive Websites.