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core-css-pseudo-classes

CSS Pseudo-classes

Last reviewed May 28, 2026 Content v20260528
Track mode
iframe_html
Means
HTML preview sandbox
Reading
~1 min
Level
advanced

This lesson

This lesson teaches CSS Pseudo-classes—the ideas, syntax, and habits you need before moving on in CSS.

Without a solid grasp of CSS Pseudo-classes, you will repeat mistakes in CSS exercises and on real pages or scripts.

You will apply CSS Pseudo-classes in contexts like: All browser UIs, component libraries, marketing sites, and many native apps that reuse web views.

Read the lesson, edit HTML/CSS in the playground, press Run to preview, then answer the lesson MCQs.

When intermediate lessons feel comfortable and you are ready for production-style trade-offs.

Pseudo-classes style elements in particular states or structural conditions.

Common pseudo-classes

  • :hover, :focus-visible, :active
  • :first-child, :last-child, :nth-child()
  • :not(), :is(), :where()

A11y warning

Do not rely on :hover alone for critical interactions; keyboard and touch users need equivalent feedback.

Important interview questions and answers

  1. Q: Why :focus-visible over :focus sometimes?
    A: It provides focus ring where appropriate without forcing it on all pointer interactions.
  2. Q: What does :not() do?
    A: Excludes matching selectors from style application.
  3. Q: What is :nth-child(2n) used for?
    A: Alternating patterns like zebra rows.

Pitfall: Check cascade order—author stylesheet loses to inline styles and !important surprises.

Interview tip Lesson completion confidence

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Playground

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Multiple choice — immediate feedback.

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