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This page and subpages of it can be used by users to record information about themselves or to test and draft new content. Pages of the form User:UserName/Foo.js or User:UserName/Foo.css can only be edited by the user themselves or by interface administrators (or administrators before MediaWiki 1.32).

This namespace is the talkspace associated with the “User” namespace. Pages in this namespace are mainly used to leave messages for particular users or inform them of discussions that may be of interest to them. To facilitate this, when a page User talk:UserName is edited, whenever the user UserName loads a page, a notice is displayed at the top of the page informing them of the edit:

This namespace is normally used for meta-discussions related to the operation and development of the wiki. It automatically redirects the user to a namespace labeled after the wiki's name, example: [[Project:Licenses]] → [[Wikipedia:Licenses]].

Because this namespace's name changes from wiki to wiki, you may want to simply look at the 5th entry in any dropdown containing a list of all namespaces. The project namespace will be listed immediately after the User talk namespace. On some wiki farms, the name "Meta" may be used for this namespace.

 

The “MediaWiki” namespace is used to hold system messages and other important content. For instance, the page MediaWiki:Edit (or MediaWiki:Vector-view-edit in the default “Vector” skin) contains the text that fills the “Redakti” tab at the top of every page. If that page exists, it overrides the default content, which is “Edit.” Similarly, MediaWiki:Common.css is the system message that holds the CSS code that is loaded for all users for each page. It has the special property that the entire namespace can only be edited by users with the (editinterface) user right. Since MediaWiki 1.32, JavaScript and CSS pages needs also editinterface and (respectively) editsitejs or editsitecss rights to edit.

The “Help” namespace is usually used to hold help files, instructions and “how-to” guides. It has no special properties. See Help namespace content.

The “Category” namespace contains categories, dynamic lists of other pages. To facilitate this, linking directly to a category page does not output an inline link, but instead includes the page into the associated category page. So the code [[Category:Help]] causes a category link to appear at the bottom of the page (at the bottom in the box marked “Kategorioj”). Clicking on that link takes you to the category page, where this page is visible in the category list.

To create an inline link to a category page, you need to add a colon to the front of the namespace: [[:Category:Help]] produces Category:Help. See Help:Kategorioj for more details on category link syntax.

Namespace names and aliases can be localized by developers. To request the localization of namespace names, please file a MediaWiki internationalization task at Phabricator . In the description of the task, you should provide translations of all the namespaces in the table to the right, as well as any additional namespaces on your wiki (such as "Module" or "Gadget").

Namespace names can be translated into languages other than English and individual namespaces can be renamed, as set by a wiki's system admins (using Namespace manager). These names are known as the 'localized' namespace names. However, all namespaces have a 'canonical name', the original English name which will work on any installation of MediaWiki. So linking to User:Foo will always locate the user page for the user foo, whether the wiki is in French (where the localized name would be Utilisateur:Foo), Russian (Участник:Foo), or Hindi (सदस्य:Foo).

On some wikis there are also namespace aliases: alternative names that will also be resolved to the localised names. For instance, a wiki might define "T" as an alias for Template, such that typing T:Foo is equivalent to Template:Foo, saving a few characters and seconds. An actual example would be on the English Wikipedia, where "WP" is an alias for Project, which is the namespace "Wikipedia".

See Manual:Using custom namespaces for more information.

JavaScript

The JavaScript variable wgCanonicalNamespace contains the full namespace name. The variable wgNamespaceNumber contains the numerical index of the namespace.

The ‎<body> tag of the HTML page output is given two CSS classes that vary by namespace: A class ns-#, where # is the index of the namespace, and ns-XXX, where XXX is "subject" for all subject namespaces , "special" for pages in the Special namespace, and "talk" for talk namespaces . So CSS code such as the following can be used to change the appearance of an object based on its namespace:

.ns-subject a {   /* Almost all links on subject pages to be green. */
    color: #0f0;
}
.ns-talk a {      /* Links on talk pages to be blue. */
    color: #00f;
}
.ns-3 a {         /* and links on user talk pages to be red */
    color: #f00;
}

You can get a complete list of all namespace names of a MediaWiki installation from the Search results page Advanced tab, or from any recent changes page such as contributions or watchlist in its options box, in a drop-down list. For the system properties of each namespace, use the MediaWiki API :

• Manual:Namespace
• Manual:Using custom namespaces
• Manual:$wgNamespacesToBeSearchedDefault