Expand/Collapse Widgets

This is an example of an expand/collapse widget. Click the header to toggle the visibility of this content. It's commonly used for FAQs, accordions, or hiding less critical information until it's specifically requested by the user.

The content within this area appears with a smooth transition effect when expanded, making the user experience more pleasant.

This widget leverages a combination of standard web technologies:

• HTML: Provides the semantic structure, including a button to trigger the action and a container (div.details) for the collapsible content.
• CSS: Handles the styling and animation. By default, the content container has max-height: 0 and opacity: 0, effectively hiding it. When an 'expanded' class is added (via JavaScript), CSS transitions these properties to a larger max-height and opacity: 1, revealing the content smoothly.
• JavaScript: Listens for click events on the toggle button. Upon a click, it dynamically adds or removes the 'expanded' class from the content container and updates the ARIA attributes (aria-expanded and aria-controls) for enhanced accessibility.

This approach offers a good balance between functionality, aesthetics, and accessibility.

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This section is specifically designed to contain a larger amount of text to demonstrate that the max-height property in the CSS is set generously (e.g., 9999px) to accommodate various content lengths without prematurely cutting off the text.

While a very large fixed max-height works well for most cases, for extremely dynamic content where the exact height can vary wildly, more advanced JavaScript might be used to calculate the precise height of the content before setting max-height. However, for general purposes, a sufficiently large fixed value provides a good balance of simplicity and effectiveness for smooth transitions.

This final paragraph ensures that there's enough content to really test the expansion.