Expand/Collapse Widgets

This is a demonstration of an expand/collapse widget built using HTML, CSS, and JavaScript.

Key features:

• Uses a button for accessibility.
• Employs aria-expanded and aria-controls attributes.
• Content is hidden/shown by toggling the hidden HTML attribute on the .details div.

When the button is clicked, a JavaScript function toggles the visibility of the associated content area.

The aria-expanded attribute is updated to reflect the current state (true for expanded, false for collapsed), which is crucial for screen readers and assistive technologies.

The aria-controls attribute links the button to the ID of the controlled content.

Expand/collapse widgets are useful for:

• Saving vertical space on a page.
• Organizing large amounts of information.
• Improving user experience by allowing users to focus on relevant content.
• Creating FAQs or accordion-style interfaces.

They help in de-cluttering the UI and presenting information progressively.