How to add click to expand content in posts

Hello, I wonder how to add a button which clicked will show hidden transcript in the content here. I saw the content support HTML. How to do that. Thank you.

1 « J'aime »
Like this?

This text will be hidden

Click on the cog and click “hide details”.

5 « J'aime »

Yes, clicking on the cog in the post editor when typing a new post or editing another one, will show the option to Hide Details.

4 « J'aime »

Exactly!!! Thank you!!!

1 « J'aime »

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