This is some content that will be revealed when the heading is clicked. It's a simple demonstration of the expand/collapse functionality.
Clicking the heading again will collapse this content.
This widget contains a list, showcasing that various types of HTML content can be hidden and shown.
This section has a bit more structure, including a subheading. The transition effect should make it appear smoothly.
The max-height CSS property is used to animate the expansion and collapse.