CSS Interview Guide: From Basics to Advanced Concepts
Welcome to our CSS Interview Guide! Whether you’re a novice or an experienced developer, this resource is your go-to for mastering CSS concepts. Dive into our concise questions and answers to sharpen your skills and ace CSS interviews.
Table of Contents
Basic CSS Interview Questions:
1. What does CSS stand for?
CSS stands for Cascading Style Sheets.
2. How do you include CSS in an HTML file?
You can include CSS in an HTML file using the <link> tag in the head section or by using the style attribute directly in HTML tags.
3. Explain the difference between padding and margin.
Padding is the space inside an element, while margin is the space outside the element.
4. What is the box model in CSS?
The box model in CSS describes the layout of elements, consisting of content, padding, border, and margin.
5. How do you center an element horizontally and vertically in CSS?
To center horizontally, use margin: auto;, and to center vertically, use display: flex; align-items: center; justify-content: center;.
6. Explain the difference between display: none; and visibility: hidden; in CSS.
display: none; removes an element from the layout, while visibility: hidden; hides the element but retains its space.
Advanced CSS Interview Questions:
7. What is the CSS specificity and how does it work?
Specificity is a set of rules used to determine the priority of styles. It is based on selectors’ strength and order in the stylesheet.
8. What is the purpose of the z-index property?
z-index controls the stacking order of positioned elements. Elements with a higher z-index are stacked above elements with a lower z-index.
9. Explain the CSS box-shadow property.
box-shadow adds a shadow effect to an element. It takes values for horizontal and vertical offset, blur radius, spread radius, and color.
10. How does Flexbox differ from Grid layout?
Flexbox is a one-dimensional layout method for laying out items in rows or columns, while Grid layout is a two-dimensional layout system for rows and columns.
11. What is the purpose of the @media rule in CSS?
@media is used to apply different styles for different devices or screen sizes. It allows for responsive design.
12. Explain the CSS pseudo-elements ::before and ::after.
::before inserts content before an element’s actual content, and ::after inserts content after the element’s actual content.
13. What is CSS preprocessing, and why is it useful?
CSS preprocessing involves using a scripting language to write CSS code, providing variables, nesting, and other features. It enhances maintainability and readability.
15. What is the transform property in CSS used for?
The transform property applies 2D or 3D transformations to an element, such as rotation, scaling, or skewing.
16. How does CSS Grid differ from Flexbox?
CSS Grid is a two-dimensional layout system for both rows and columns, while Flexbox is a one-dimensional layout system for either rows or columns.
Please find below another important question and its corresponding answer.