Cèṭa'an:Collapsible option/doc
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{{Collapsible option}} is a utility template provides a standardised message for transclusion on template documentaion pages for templates whose collapsibility may be managed by the parameter |state=.
It can be used on either the template page itself (wrapped within <noinclude>...</noinclude> tags), but it is almost always better to place it in the template's {{documentation subpage}}.