Template:Collapsible

{{Collapsible|This collapses!}}

{{Collapsible|Neat, right?|title="This has a custom title!"}}

{{Collapsible|This is a spoiler.}}

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.