Expand/Collapse Widget Examples

What is HTML?

HTML (HyperText Markup Language) is the standard markup language used to create web pages. It provides the structure and content of websites by using a system of tags and elements.

What is CSS?

CSS (Cascading Style Sheets) is used to style and layout web pages — to add effects such as colors, fonts, and spacing. It works alongside HTML to create the visual presentation of web content.

What is JavaScript?

JavaScript is a programming language that enables interactive web pages. It can update content, control multimedia, animate images, and perform many other dynamic functions on websites.

Frequently Asked Questions

How do I create an accessible expand/collapse widget?

To create an accessible expand/collapse widget, you should:

  • Use semantic HTML elements like <details> and <summary>
  • Ensure keyboard navigation with proper focus management
  • Provide clear visual indicators for expanded/collapsed states
  • Include proper ARIA labels if using custom implementations
  • Test with screen readers and keyboard-only navigation
Are native details elements accessible?

Yes, the native HTML <details> element is fully accessible by default. It has built-in keyboard support, proper focus management, and works with screen readers without requiring additional ARIA attributes.

Features & Benefits

Key Features:

  • Lightweight and easy to implement
  • Fully keyboard accessible
  • Works across all modern browsers
  • No JavaScript required for basic functionality
  • Customizable styling
Browser Support

The native <details> element is supported in all modern browsers including:

  • Chrome 12+
  • Firefox 49+
  • Safari 15.1+
  • Edge (all versions)

For older browsers, polyfills are available.

Best Practices
  • Keep summary text concise and descriptive
  • Use semantic HTML for content within details
  • Avoid nested details elements when possible
  • Test with assistive technologies
  • Provide visual feedback on interaction