Plainlinks

From MediaWiki.org

The MediaWiki css class plainlinks is one of several built in classes that you can use. Specifically it is most useful for constructing internal links to special pages that are not otherwise possible. The plainlinks class removes the little arrow that would normally accompany an 'external' link.

An example of the use of the plainlinks class within a template would be the following:

<span class="plainlinks">[{{ fullurl: Special:Allpages |namespace={{{1|3}}} }} {{ ns: {{{1|3}}} }}]</span>

Result: User talk
or simply

<span class="plainlinks">http://www.mediawiki.org/w/index.php?title=Special:Allpages&namespace=3</span>

Result: http://www.mediawiki.org/w/index.php?title=Special:Allpages&namespace=3
or even

<span class="plainlinks">[http://www.mediawiki.org/w/index.php?title=Special:Allpages&namespace=3 Link Text]</span>

Result: Link Text

You could also adjust the css file with the correct internal link color #002bb8. Change in plainlinks a:

#bodyContent .plainlinks a {
	background: none !important;
	padding: 0 !important;
	color: #002bb8 !important;
}

Note:: This is actually a fix for a reported bug. Links pointing to the own domain should be recognized as internal links by MediaWiki.