Vorlage:Collapsible

Usage:
Title: is the title of the element
Some collapsible content: is the text content, that can be collapsed
expanded: mandatory argument - if present, then the element is expanded by default. Otherwise it is collapsed.

{{collapsible|Title|Some collapible content|expanded}}

Result:

Title

Some collapible content

{{collapsible|Title|Some collapible content}}

Result:

Title

Some collapible content