Summary: This is a straightforward expandable area controlled by the button above. It uses ARIA attributes (aria-expanded on the button and aria-hidden on the region) and a visible chevron that rotates when expanded.
Use keyboard (Tab to focus, Space/Enter to toggle) or click to open and close the content.
Here is some additional information. The content can include lists, forms, or even another toggle inside.
This is a nested details area. Accessible patterns still apply: the inner button controls the inner region independently.
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