Expand / Collapse Widget

This area is controlled by the "Show" button. The button has aria-expanded and aria-controls attributes that are updated when toggled.

Use this pattern to reveal supplemental information, short instructions, or a summary of larger content. The region is collapsed by default and expands smoothly when the button is activated.

Useful for disclosure of grouped content like lists, settings, or FAQs.

• Item 1 — short description
• Item 2 — additional detail
• Item 3 — another row
• Item 4 — final item