core to their own respective repositories. See also
https://www.mediawiki.org/wiki/Skin:Modern and
https://www.mediawiki.org/wiki/Skin:CologneBlue.
+* BREAKING CHANGE: Skins built for MediaWiki 1.15 and earlier that do not use
+ the "headelement" template key are no longer supported. Setting
+ $useHeadElement = false; is no longer supported and will not cause old keys
+ like "headlinks", "skinnameclass", etc. to be defined.
==== Renamed classes ====
* CLDRPluralRuleConverter_Expression to CLDRPluralRuleConverterExpression