Which statement best describes the difference between pseudo-classes and pseudo-elements?

Which statement best describes the difference between pseudo-classes and pseudo-elements?

• A. Pseudo-classes target element states; pseudo-elements style parts of elements.
• B. Pseudo-classes style parts of elements; pseudo-elements target states.
• C. Both are used to style entire elements, with no distinction.
• D. Pseudo-classes create new elements in the DOM; pseudo-elements do not.

Answer: (B)

The difference being tested is that pseudo-classes respond to element states, while pseudo-elements style parts of an element’s content. Pseudo-classes select elements based on conditions like user interaction or structural position—examples include hovering over an element, focusing it, or selecting a specific child. Pseudo-elements, on the other hand, apply styles to a part of an element’s content, often generating content or styling designated portions such as content inserted before or after an element, or styling the first letter or first line. So, the statement that describes this correctly says pseudo-classes target states and pseudo-elements style parts of elements. The other descriptions blur distinctions or imply things that aren’t true in CSS—for instance, pseudo-classes styling parts, or pseudo-classes creating actual DOM elements.

The difference being tested is that pseudo-classes respond to element states, while pseudo-elements style parts of an element’s content. Pseudo-classes select elements based on conditions like user interaction or structural position—examples include hovering over an element, focusing it, or selecting a specific child. Pseudo-elements, on the other hand, apply styles to a part of an element’s content, often generating content or styling designated portions such as content inserted before or after an element, or styling the first letter or first line.

So, the statement that describes this correctly says pseudo-classes target states and pseudo-elements style parts of elements. The other descriptions blur distinctions or imply things that aren’t true in CSS—for instance, pseudo-classes styling parts, or pseudo-classes creating actual DOM elements.