Thread:AscendedBook/@comment-34929636-20200322193940

I created three new templates: Template:CollapseBeginOpen, Template:CollapseBeginClosed, and Template:CollapseEnd.

For structural reasons, they had to be separated, so usage is little odd: Some block of text. Can be as long as you want. extra line just because

which gives this: Some block of text. Can be as long as you want. extra line just because Note the open/close button.

Additional options: These optional arguments allow the labels on the button to be changed.

 