How can I create a dropdown arrow HTML element on my post?

So, in some posts I’ve seen that people had something like this:
image
(NOT CLICKABLE)

Where you click it and either text or images that were within it appear, and if you click it again they go back.

How can I insert this element into my posts? Thanks!

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Like this?

Text goes here!
image

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Yep! Thank you!! I couldn’t figure that out for the life of me :joy:

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