Möglichkeiten, einen Beitrag zu gestalten?

I’m editing the FAQ of my site and I’m wondering to what extent the composer can be used to style it beyond what’s in the bbcode plug-in.

For example, what if I wanted my FAQ to be “accordion style,” where below each heading there is a dropdown which reveals more info? I know in some forums there is [accordion][/accordion] in bbcode.

In addition, can HTML still be used to style a post? According to this post that’s not the case anymore.

So am I limited to just the basis of color/size etc from the bbcode plugin?