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+The `if` directive is supplied by the [[!iki plugins/conditional desc=conditional]] plugin.
+With this directive, you can make text be conditionally displayed on a page.
+ \[[!if test="enabled(smiley)"
+ then="The smiley plugin is enabled :-)"
+ else="No smiley plugin here.."]]
+If the specified `test` succeeds, the `then` text will be displayed,
+otherwise the `else` text will be displayed. The `else` part is optional.
+The `then` and `else` values can include any markup that would be allowed
+in the wiki page outside the template. Triple-quoting the values even allows
+quotes to be included.
+The `test` is a [[ikiwiki/PageSpec]]; if it matches any page in the wiki
+then it succeeds. So you can do things like testing for the existence of a
+page or pages, testing to see if any pages were created in a given month,
+and so on.
+If you want the [[ikiwiki/PageSpec]] to only match against the page that
+contains the conditional, rather than matching against all pages in the
+wiki, set the "all" parameter to "no".
+In an `if` directive, the regular [[ikiwiki/PageSpec]] syntax is expanded
+with the following additional tests:
+ Tests whether the specified plugin is enabled.
+ Tests whether the glob matches the name of the page that contains the
+ Tests whether the glob matches the name of the page that is being built.
+ That might be different than the name of the page that contains the
+ conditional, if it's being inlined into another page.
+ Tests whether the page is being included onto another page.
+[[!meta robots="noindex, follow"]]