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{{tl|Collapsible option}} provides a standardised message for [[Wikipedia:Transclusion|transclusion]] on the pages of collapsible templates whose collapsibility may be managed by the parameter <code>state</code>.

It may be used on either the template page itself (wrapped within {{tag|noinclude}} tags) or on the template's {{tl|documentation subpage}}.

===Indicating optional use of ''state'' name===
The <code>state</code> parameter used to manage collapsible templates need not always be named explicitly, i.e. {{braces|[''Template name'']{{!}}''state''}} can be the same as {{braces|[''Template name'']{{!}}state&#61;''state''}}. To indicate this in the <nowiki>{{Collapsible option}}</nowiki> message, add the parameter {{para|statename|optional}}. This modifies the message so that it reads (if it were used for itself):
<div style="clear:both;margin:1.0em 0;background:whitesmoke;">
{{Collapsible option |statename=optional}}
</div>
<div style="font-size:95%;line-height:1.7em;">(This possibility is enabled by including:
*<code><nowiki>{{{1|}}}</nowiki></code> as part of a collapsible template's <code>state</code> parameter{{spaced ndash}}for instance, as {{para|state|<nowiki>{{{state|{{{1|}}}}}}</nowiki>}} or {{para|state|<nowiki>{{{state|{{{1|<noinclude>expanded</noinclude>}}}}}}</nowiki>}}, etc.
*<code><nowiki><noinclude></nowiki></code>,<code><nowiki><includeonly></nowiki></code>as part of a collapsible template's <code>state</code> argument{{spaced ndash}}for instance, as {{para|state|<nowiki>{{{state<includeonly>|collapsed</includeonly>}}}</nowiki>}}
If, however, the template includes collapsible sections within itself (e.g. {{tl|Navbox with collapsible groups}}), then enabling this possibility may introduce ambiguity as regards what is to be collapsed or expanded. In those instances, therefore, the requirement to use {{para|state}} should be retained.)</div>

===Changing the default state===
To change the default state <nowiki>{{Collapsible option}}</nowiki> uses, add the parameter {{para<!--|plain-->|default|collapsed}} or {{para<!--|plain-->|default|expanded}} accordingly. To restore the default, remove any {{para<!--|plain-->|default}} previously included.

===''nobase''===
If the template name given to <nowiki>{{Collapsible option}}</nowiki> includes a (forward-)slash character ("/"), the parameter {{para<!--|plain-->|nobase}} (set to "on", "true", etc.) will need to be added so that the name is displayed correctly (i.e. so that {{tld|PAGENAME}} rather than the default {{tld|BASEPAGENAME}} is used to display it).

== See also ==
* {{tl|Collapsible lists option}}
* {{tl|Collapsible sections option}}
* [[Help:Collapsing]]

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