Template:Spoiler

Usage

Enter {{spoiler|text}} inside an article section. Example:

{{spoiler|This section explains Novac's quest}}

There's a showhide extension for mediawiki:

<showhide>Some public text __HIDER__
<hide>And this is the description of the secret</hide>
</showhide>

But maybe the spoiler extension is the better choice: <spoiler text="Spoiler description">Hidden text which gives away the description of the secret</spoiler>