Template:Collapsible option/doc

provides a standardised message for transclusion on template pages whose templates include a state parameter through which their collapsibility may be managed.

It may be used on either the template page itself, wrapped within  tags, or on the template's documentation subpage.

Indicating optional use of state name
The state parameter used to manage collapsible templates need not always be named explicitly, i.e.  can be the same as. To indicate this in the message, add the parameter optional. This modifies the message so that it reads:

( This possibility is enabled in a collapsible template by including  as part of its state parameter, e.g. as    or  , etc. If, however, the template features collapsible sections within itself (e.g. Navbox with collapsible groups) then enabling this possibility may introduce ambiguity as regards what is to be collapsed, expanded, etc. The need to use "state" in these instances should, therefore, be retained. )

Changing the default state reported
To change the default state reports in its fourth bullet-point, add the parameter collapsed  or expanded  accordingly, or, to restore the autocollapse report, remove any default included when  is used.