Kaozeadenn Patrom:Xo

Defaults to autocollapse. A navbox with autocollapse will start out collapsed if there are two or more tables on the same page that use other collapsible tables. Otherwise, the navbox will be expanded. For the technically minded, see MediaWiki:Common.js.
If set to collapsed, the navbox will always start out in a collapsed state.
If set to plain, the navbox will always be expanded with no [hide] link on the right, and the title will remain centered (by using padding to offset the v • d • e links).
If set to off, the navbox will always be expanded with no [hide] link on the right, but no padding will be used to keep the title centered. This is for advanced use only; the "plain" option should suffice for most applications where the [show]/[hide] button needs to be hidden.
If set to anything other than autocollapse, collapsed, plain, or off (such as "uncollapsed"), the navbox will always start out in an expanded state, but have the "hide" button.

To show the box when standalone (non-included) but then auto-hide contents when in an article, put "uncollapsed" inside <noinclude> tags:

state = <noinclude>uncollapsed</noinclude>
That setting will force the box visible when standalone (even when followed by other boxes), displaying "[hide]" but then auto-collapse the box when stacked inside an article.

Often times, editors will want a default initial state for a navbox, which may be overridden in an article. Here is the trick to do this:

In your intermediate template, create a parameter also named "state" as a pass-through like this:
| state = {{{state<includeonly>|your_desired_initial_state</includeonly>}}}
The <includeonly>| will make the template expanded when viewing the template page by itself.