★ Precisely speaking, you can input HTML, Script, Iframe, CSS ... anything.
★ You can customize it in many ways to fit onto your theme.
★ There are 4 (four) expand/collapse icon styles to choose from.
★ Apart from this, you may selectively control 5 effects that include:
-> Open - onClick/onHover
-> Collapse Previous
-> Scroll to Header
-> Persist Opened
-> Animated Speed
★ Very tiny.
★ Very easy to configure.
★ Compatible in all major browsers.
Interestingly, you develop your content within the module setup (as opposed linking to the external content of an article or category).
The author provides excellent support and is seriously committed to the quality of their work.