Manual:$wgXhtmlDefaultNamespace

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<translate> Output</translate>: $wgXhtmlDefaultNamespace
Namespace to use when outputting in XHTML mode.
<translate> Introduced in version:</translate>1.9.0 (r18943)
<translate> Deprecated in version:</translate>1.22.0 (Gerrit change 63106; git #97caae59)
<translate> Removed in version:</translate>1.34.0 (Gerrit change 522570; git #a8d26127)
<translate> Allowed values:</translate>(string)
<translate> Default value:</translate>'http://www.w3.org/1999/xhtml' (defined in Setup.php )

Details

What namespace to use when in XHTML mode. This is the xmlns attribute on the root ‎<html> element. When in HTML5 mode (default in recent MediaWiki), this setting is ignored.

See also