collapsible

In hac habitasse platea dictumst. Suspendisse dictum, velit vel vehicula gravida,
turpis nulla dignissim nibh, a tristique enim dui vestibulum enim. Duis cursus
euismod diam vitae gravida. Etiam a purus lorem.

Here is another paragraph that will expand. It can be long or short. You can add
any formatting and layout you want to a collapsible item. For example:

Here is a subheading

More text.