Hide or collapse text in Pluto

In some cases, it can be useful to hide text (as opposed to markdown) in notebooks when certain details may interrupt the flow of one’s main points. The analog in a static document would be a footnote. Is there a way to hide or collapse text in Pluto so that readers can optionally access certain information if desired?

I tried adding html with @htl, but it would not respond to a click. Here is the code.

I think one of the issues is that I need to return something in the @htl block, but its not clear to me what should be returned. I tried coll and document without success.

I came across details(md""" """). I think this should suffice for my purposes.

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