An expand/collapse widget lets users reveal or hide content on demand. This helps manage long pages by presenting a concise summary and providing the option to view more details when needed.
Accessibility considerations include using a native button for focus and keyboard interactions, and tying the button to the content with aria-expanded and aria-controls attributes.
Click the header button to expand or collapse the content. The state is indicated by the aria-expanded attribute on the button, and the panel is shown or hidden accordingly.