Template:Collapsible

Expand
This collapses!

Expand"This is a header!"
Neat!

Expand
Cool!
"This is a footer!"

Expand"This is a header with a footer!"
Awesome!
"The aforementioned footer!"

Adaptation of Template:Spoilers using MediaWiki collapsible tables to keep the information concealed unless the reader specifically expands the section to read them. I basically just copy-pasted what they did and added additional parameters so you can put in whatever you want.