CSS Cheat Sheet 2026

The 30 highest-yield CSS facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. We don't have to reapply style information throughout the document or to external documents when using Inline Style. → A) False
2. Which CSS property controls the space between an element's content area and its border? → padding
3. A style can be applied to just one tag by using a ___________ → id rule
4. Select a CSS property for collapsing the borders between table cells. → border-collapse
5. Which of the following are Webkit's CSS Extension Prefixes? → -webkit
6. Which keyword value for `animation-iteration-count` causes an animation to repeat indefinitely? → infinite
7. Which value will determine the width of the viewport? → color-index
8. Which of the following is the CSS3 HSL value with a fourth value to determine the color's alpha channel value to define the element's opacity? → HSLa Color
9. Which of the following functions is used by the filter property to change the brightness of an element's color? → brightness()
10. Which of the following best describes browsing without the use of stylesheets? → CSS OFF/Images ON
11. Identify the CSS property that defines the border's bottom-left corner shape. → border-bottom-left-radius
12. Direct descendents are selected by which of the following selectors? → E > F
13. What does `animation-direction: alternate` do? → Plays forward on odd iterations and backward on even iterations
14. How many ways to define the border-image-width CSS property? → 9
15. Which property controls the size of text? → font-size
16. Which of the following is a JavaScript framework extension? → Formalize
17. What does the CSS `will-change` property do in the context of animations? → Hints to the browser which properties will be animated so it can optimize rendering
18. On hover, which of the following will provide a minimalist entrance effect? → linear pop-up
19. Which one should be used to overlay text on a high-contrast image? → screen
20. When the content exceeds the width of its enclosing element, which of the following properties governs how it should behave? → overflow-x
21. Can a CSS custom property be overridden for a specific element by redeclaring it in that element's selector? → Yes, the new declaration scopes the variable to that element and its descendants
22. ___________ has a grammar, but it is not defined with a document type definition like regular (X)HTML. → CSS 2.1
23. In a single declaration, which of the following CSS properties defines the distinct properties of all four sides of an element's border? → border-width
24. What does `padding: 10px 20px` set for an element? → Top/bottom = 10px, left/right = 20px
25. Every element at the block level appears on a new line? → normal flow
26. What value of `animation-fill-mode` keeps the element styled by the last keyframe after the animation ends? → forwards
27. A 3D grooved outline is defined by which of the following values? → groove
28. The _____________ property links an element to a background image. → background-image
29. Which of the following selectors selects all E elements with the attribute attr and a value ending in the provided value? → E[attr$=value]
30. Which of the following determines the distance between adjacent cell borders? → border-spacing