This tag works only with the Chrome browser.

#+HTML: <details>
#+HTML: <summary>Lorem ipsum dolor sit amet, consectetuer adipiscing elit</summary>
- Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
- Proin quam nisl, tincidunt et, mattis eget, convallis nec, purus.
- Sed diam.
- Nam vestibulum accumsan nisl.
#+HTML: </details>