CSS quiz

Test your CSS knowledge with a free interactive quiz — 47 questions with answers and explanations. No signup needed to play.

What is the difference between `em` and `rem` units?

1. What is the difference between `em` and `rem` units?
2. What does CSS stand for?
3. What is the CSS box model?
4. What does `float` do in CSS?
5. What does `position: sticky` do?
6. What is the cascade in CSS?
7. What is `z-index` used for?
8. What is CSS inheritance?
9. What does `justify-content` do in Flexbox?
10. What is a CSS custom property (variable)?
11. What is `display: none` vs `visibility: hidden`?
12. What does `position: absolute` do?

More quizzes