CSS Dropdowns

Last reviewed May 28, 2026 Content v20260528

This lesson

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

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

You will apply CSS Dropdowns 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.

Dropdown styling should support both pointer and keyboard use. CSS-only hover dropdowns are often inaccessible.

Menus triggered only on :hover fail touch and keyboard users; pair with JS state and ARIA semantics.

Q: Why is pure hover dropdown problematic?
A: No reliable keyboard/touch interaction and often missing state announcements.
Q: Typical dropdown layering issue?
A: Clipping/overlap from overflow or z-index stacking contexts.
Q: What CSS improves menu readability?
A: Clear item spacing, hover/focus backgrounds, and shadow/border separation.

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

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