Stef-Dan This code is not working: [spoiler] [details=Summary]Content[/details] [/spoiler] Summary will be outside of the spoiler.
Pollux Stef-Dan That's how it works. Content will be hidden and only revealed after expanding, Summary gives a hint about the content beforehand.
010101 Freenixi Looks like it doesn't according to the comments above. But, you could try my extension. It includes a similar BBCode - although, not as visually minimal as this one. But, still fairly minimal looking. It's the accordion one. https://discuss.flarum.org/d/18958-big-beautiful-bbcodes
Ralkage This extension was officially updated for beta 8 compatibility and migrated over to the FriendsOfFlarum namespace. Please see: https://discuss.flarum.org/d/18796-friendsofflarum-bbcode-details