the MediaWiki icon but plain text instead.
$skin: Skin object
+'SkinPreloadExistence': Supply titles that should be added to link existence
+cache before the page is rendered.
+&$titles: Array of Title objects
+$skin: Skin object
+
'SkinSubPageSubtitle': At the beginning of Skin::subPageSubtitle().
&$subpages: Subpage links HTML
$skin: Skin object