CSS3 interview questions and Answers

Last updated on Feb 07, 2024
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CSS3 interview questions

It is a simple yet advanced design language aimed to simplify the process of making web pages more presentable. As it handles the look and feels of web pages, users can control text color, font style, layout for paragraphs & columns, layout designs, display variation for different devices and screen sizes, and plenty more. We will discuss a set of most interviewer asked CSS3 interview questions further here for your acknowledgment. As it’s easy to learn but offers powerful control over the HTML document presentation, most of the online businesses are hiring CSS experts to manage their HTML web pages exclusively.

Most Frequently Asked CSS3 interview questions

Here in this article, we will be listing frequently asked CSS3 interview questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

Q11. What are the difference between CSS and CSS3?
1. Mostly focused on offering various formatting features Focused on improve the design of web pages.
2. Missing features such as layer design, page element addition, special effects, etc. Easier to use and includes plenty of features that were missing on CSS.
3. Can’t split into modules Can split into multiple modules
4. Only support single text blocks Multi-column text blocks are supported here.
Q12. What is attr()?

In CSS3, the attr() function is used to retrieve the value of an attribute of the element selected and use it in the style sheet. This function also can be used on pseudo-elements, in which case pseudo-element's originating element attribute value will be returned.

Q13. What is the use of CSS3 Sprites?

CSS3 Image sprites are a collection of images put in a single image to reduce the number of server requests, thereby saving bandwidth, and avoiding multiple server requests for each image.

#homeDiv {
   width: 32px;
   height: 32px;
   background: url(img_cssprites.gif) 0 0;

In the above example, we have combined 3 images into a single GIF, cssprites and we can use CSS to display a specific part as required.

Q14. How does the Z Index work in CSS3?

In CSS, the z-index property specifies the stack order of elements. An element having a greater stack order is placed in front of an element with a lower stack order.

Here’s its CSS Syntax:

z-index: auto|number|initial|inherit;

Here’s an example to set the z-index of an image:

img {
   position: fixed;
   left: 3px;
   top: 10px;
   z-index: -2;

Q15. What is the white-space property in CSS?

White-space is a property within CSS which helps in controlling whitespace and other line breaks inside an element’s text. It has a default value of normal.

Here’s an example to display the different values within a white-space property:

p.e {
   white-space: nowrap;
p.f {
   white-space: normal;
p.g {
   white-space: pre;

Q16. What are CSS3 Transitions?
Q17. What is a flexbox layout?
Q18. What is the difference between “word-break: break-all” and “word-wrap: break-word” in CSS?
Q19. What is text-overflow property use in css3?
Q20. What is the function of the CSS clear property?
  • Saves time with web designing and development
  • Easy to maintain and superior to HTML
  • Better device and browser compatibility

Let’s discuss best interview questions on CSS3 prepared by industry niche experts for your acknowledgment. These CSS3 interview questions are suitable for experienced as well as beginners.

As web design plays a vital role these days to draw some potential customers, it enhances not only the look and feel of a website but also magnets more numbers of clients and eventually better ROI.

Reviewed and verified by Umesh Singh
Umesh Singh

My name is Umesh Singh having 11+ experience in Node.JS, React JS, Angular JS, Next JS, PHP, Laravel, WordPress, MySQL, Oracle, JavaScript, HTML and CSS etc. I have worked on around 30+ projects. I lo...