Collapsible code sections in discourse?

[rafael.guerra]

Sorry if this might be trivial but have no idea of how to do it:
Saw on a number of occasions “collapsible” Julia code blocks in discourse posts.
Cannot find an example right now but basically the hidden code expands after clicking on the text header with an arrow.
Thank you.

[LaurentPlagne]

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Summary

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[jzr]

<details>
foo bar
</details>

foo bar

[rafael.guerra]

Thanks both!