wiki formatting spoiler tags

How do you make a spoiler tag in tiddlywiki?  Tiddlywiki supports basic wikipedia formatting, but maybe it will need some custom CSS

The real question is, why are you asking this here?

this is programming isn't it?
although it is css/web "programming" that still qualifies.

Use the source, Luke

    EXPERT HTML PROGRAMMING
           _{solve NP problems with ease!}

>>3
get out

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Since the 5th century BC, beginning with Greek mathematician Zeno of Elea in the West and early Indian mathematicians in the East, mathematicians had struggled with the concept of infinity. Especially notable is the work of Bernard Bolzano in the first half of the 19th century