Accessible Expand / Collapse Widget Showcase

These examples use the native <details> element for expandable sections, with enhanced styling and utility controls to open or close groups of widgets programmatically.

What is an expand/collapse widget?

An expand/collapse widget allows users to reveal or hide additional information interactively. The native HTML <details> element provides this functionality with built-in accessibility features, including keyboard support and proper focus semantics.

When should you use this pattern?
  • To progressively disclose non-critical information.
  • When space is limited but optional details are available.
  • To provide FAQs or contextual help alongside primary content.
Implementation tips for custom styling
  1. Remove the default marker using summary::-webkit-details-marker and custom pseudo-elements for icons.
  2. Provide clear focus states and ensure the summary is easy to activate via keyboard.
  3. Use the [open] attribute selector to animate or adjust styles when the widget is expanded.