will no longer be output and OutputPage::addKeyword no longer exists.
* Methods Title::userCanEditCssSubpage and Title::userCanEditJsSubpage,
deprecated since 1.19, have been removed.
+* (bug 50134) Hook functions are no longer required to return a value. When a
+ hook function does not return a value (or when it returns an explicit null),
+ processing continues. To abort the hook, a hook function must return an
+ explicit, boolean false or a string error message. Other falsey values are
+ tantamount to a 'return true' in earlier versions of MediaWiki.
== Compatibility ==