This is the {{If usertalk of }} meta-template. It is used to customise a notice when it is being put on the user talk page of a page in the user's userspace.
This template usually takes two or three parameters:
{{ If usertalk of | (userspace page) | ("then" action) | ("else" action)}}
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.
