That warning block in example is not a directive btw. It’s just a style I see people randomly type in instruction manual, on things that people shouldn’t do if they want to not die. Basically its used in the wild as an enclosed box that is empathised for visibility.
(Wonder if we should make an ‘emphasis’ block where !!! <Important Block> !!! as the start header, and !!! for the end header. Edit: Content Block/Inline Syntax )