The template implements the class unconfirmed-show, which displays its content only to readers who are unconfirmed (IP users and new users).
It takes the text to be shown/hidden as its first unnamed parameter and encloses it in a span (i.e. inline). Adding anything as a second parameter (suggested "block") will cause the text to be displayed as a block element.
Some text.{{Unconfirmed only|This is only seen by unconfirmed readers.}} More text → Some text.This is only seen by unconfirmed readers. More text
Some text.{{Unconfirmed only|This is only seen by unconfirmed readers.|block}} More text → Some text.
This is only seen by unconfirmed readers.
More text
Namespace and pagename-detecting templates
Namespace
Pagename
When on basepage Detects and acts according to whether it is on a basepage or on any subpage (that is, a ../.. subpage).
When pagename is For pattern matching on the pagename.
Module:Page Can take apart and put together pagenames in several ways.
IP-talk Returns IP-user talkpage, registered-user talkpage or non-user talkpage.
IP-user other For detecting IP-user pages.
Subpage other Pagename has an after-slash part (not in mainspace)
Sandbox other Page is subpage /sandbox (template space)
Testcases other Page is subpage /testcases (template space)
Rootpage other Page is rootpage (vs. /subpage) (template space)
Others
Stub other Detects whether it is on a page with a stub template or not.
Redirect other Detects whether it is on a redirect or not.
If preview Detects whether page is viewed as a preview or not.
If IP Displays different content to IP users and logged-in users.
If autoconfirmed Displays different content to autoconfirmed and non-autoconfirmed users.
If extended confirmed Displays different content to extended confirmed and non-extended confirmed users.
If administrator Displays content only to admins.
If mobile Displays different content to mobile users and desktop users.
Noscript Detects whether page is viewed with a JavaScript-capable client or not.
