CSS Interview Questions to Prepare for Your Job Interview


Every industry is seeing increasing adoption of web apps and websites, and CSS is required to create attractive web pages, along with HTML and JavaScript. Web developers with a strong understanding of HTML and CSS are in high demand right now.

Candidates who want to pursue a profession in web design must succeed in interviews where they are asked CSS interview questions. We’ve compiled a list of most frequently asked CSS interview questions in this article and categorized them into four categories:

  1. Basic CSS interview questions
  2. Intermediate CSS interview questions
  3. Advanced CSS interview questions, and
  4. General CSS interview questions.

Both seasoned professionals and newcomers will find this list useful. With that out of the way, let’s begin exploring our list of the best CSS interview questions.

Most Frequently Asked CSS Interview Questions

Basic CSS Interview Questions

Question 1. What is CSS and where did it come from?

Answer: CSS is an acronym for Cascading Style Sheets. It’s a common styling language that’s used in conjunction with HTML to create web pages. It works with all types of XML documents, including plain XML, SVG, and XUL.

CSS is based on SGML (Standard Generalized Markup Language). It’s a programming language for defining markup languages.

Question 2. What is the CSS Box model? What CSS properties are included?

Answer: Every HTML element is encased in a rectangle box. The rectangular box’s height and width are calculated using the box model. Width and height (or, in the absence of those, default values and the content inside), padding, borders, and margin make up the CSS Box.

Question 3. What is the best way to include CSS in a web page?

Answer: CSS can be integrated into web pages in three ways:

  1. Style sheets are inserted in an HTML document using the inline approach.
  2. The embedded (internal) approach gives a distinct style to a document.
  3. When you wish to make modifications to numerous pages, you use the linked/imported/external technique.

Question 4. What are some of the benefits of CSS?

Answer: The following are the key CSS benefits:

  • Separation of content and presentation – CSS allows you to offer the same material in a variety of presentation formats, whether on a mobile device, a desktop computer, or a laptop.
  • Simple to maintain – CSS may be used to completely modify the look and feel of a website by making minor adjustments. Simply modify the style to create a worldwide change, and all elements on all web pages will be updated immediately.
  • Bandwidth – When style sheets are used efficiently, they are saved in the browser cache and can be used on different pages without having to be downloaded again.

Intermediate CSS Interview Questions

Question 5. What are CSS’s constraints?

Answer: CSS has the following drawbacks:

  • Style selectors – Some style selectors are supported by all browsers, while others are not. Using the @support selector, we must detect whether a style is supported or not.
  • Cross-browser compatibility: In different browsers, certain selectors operate differently).
  • There isn’t a parent selector available: You can’t pick a parent tag with CSS right now.

Question 6. What are CSS frameworks and what do they do?

Answer: CSS frameworks are pre-built libraries that make styling web pages easier and more standard compliant. The following are some of the most often used CSS frameworks:

  • Bootstrap
  • Foundation
  • Semantic UI
  • Gumby
  • Ulkit

Question 7. What’s the difference between CSS reset and CSS normalize? 

Answer: CSS resets try to get rid of all built-in browser styling. For example, all elements’ margins, paddings, and font sizes are reset to the same size.

Normalize CSS tries to ensure that built-in browser styling is consistent across all browsers. Bugs in common browser dependencies are also fixed.

Question 8. What does VH/VW, viewport height/width, mean in CSS?

Answer: It’s a CSS unit that measures the height and breadth of the viewport in percentages. It’s mostly used in responsive design methods. The value VH is equal to 1/100 of the viewport’s height.

If the browser’s height is 1000 pixels, 1vh equals 10 pixels. In the same way, if the width is 1000px, 1 vw equals 10px.

Advanced CSS Interview Questions

Question 9. What are the benefits of using Embedded Style Sheets?

Answer: You can design classes that can be applied to a variety of tag kinds in the document. In complex scenarios, selector and grouping methods can be used to apply styles. Importing the data does not necessitate any further downloads.

Question 10. Explain a CSS selector.

Answer: It’s a string that specifies which elements are affected by a certain declaration. A link between the HTML document and the style sheet is also known as a link. It’s the same as HTML elements. CSS selectors come in a plethora of varieties:

  • Class Selector
  • Element Selector
  • Group Selector
  • Id Selector
  • Universal Selector

Question 11. What are the different box sizing properties?

Answer: The box-sizing CSS property controls how an element’s total width and height are calculated. The default width and height parameters for the content-box element only apply to the element’s content. Padding and a border are applied to the box’s outside.

The element’s content and padding are affected by the width and height parameters. The border is applied to the box’s exterior. Only Firefox currently supports the padding-box value. The content, padding, and border are all affected by the width and height settings.

Question 12. What do you know about RWD?

Answer: RWD is an acronym for “responsive web design.” This strategy is used to ensure that the created website looks great on any screen size and any device, such as a smartphone, tablet, desktop, or laptop. There’s no need to make a separate page for each device.

General CSS Interview Questions

Question 13. Name some major benefits of using CSS sprites.

Answer: Because each image sends out an HTTP request separately, a web page with a high number of photos takes longer to load.

CSS sprites are used to minimize the loading time of a web page by combining multiple small pictures into a single image. It decreases the number of HTTP requests and, as a result, the time it takes for pages to load also reduces.

Question 14. Is there a difference between logical and physical tags?

Answer: Presentational markup refers to physical tags, whereas logical tags have no visual impact. Physical tags are newer forms; logical tags, on the other hand, are older and focus on content.

Question 15. Enumerate the components of the CSS Box model.

Answer: The CSS box model is used to specify the appearance and arrangement of CSS elements. The elements are as follows:

  • Margin – It removes the region around the border with a margin. It’s see-through.
  • Border – The padding’s border depicts the area around it.
  • Padding – It is the process of removing the space around the content. It’s see-through.
  • Content – It represents material such as text, graphics, and so on.

Question 16. What is CSS’s float property?

Answer: The CSS float property is used to wrap the text around the image and move it to right or left. It has no effect on the properties of the elements that came before it.


We’ve come to the end of our CSS interview questions post, and there’s a good chance your interviewer will ask you these questions. Make sure to answer questions in a composed and comfortable manner. Wish you luck!

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