This is a simple expand/collapse widget. The content area is wrapped in a container with the class "details" and expands with a smooth height transition. You can put any kind of content here, such as text, lists, images, or other widgets.
This second example demonstrates that the same widget pattern can be reused multiple times on a page. The container for the controlled content uses the required "details" class as specified.
Tip: Try expanding and collapsing both panels to see independent behavior.