* $wgSkipSkin, which has been replaceable by $wgSkipSkins since 2005 (r9249), is
now formally deprecated.
* Removed deprecated $wgDisabledActions as it is hardly used anywhere.
+* $wgRateLimitLog has been deprecated and replaced by
+ $wgDebugLogGroup['ratelimit'].
=== New features in 1.23 ===
* ResourceLoader can utilize the Web Storage API to cache modules client-side.
whether to send a watchlist email notification.
* (bug 42026) Special:Contributions now includes an option to filter page
creations, similar to the topOnly option.
+* Add mediawiki.ui.button styling to all pages so wiki content can use styled
+ buttons.
+* Special:UserLogin/signup now does AJAX checks for invalid and taken usernames,
+ displaying the error live.
=== Bug fixes in 1.23 ===
* (bug 41759) The "updated since last visit" markers (on history pages, recent
message instead of leading the user to make a null edit.
* (bug 52659) mediawiki.notification: Notification area remained visible when
empty and thus was stealing pointer events from links on the page.
+* (bug 26811) When a DBUnexpectedError occurs, DB server hostnames are now
+ hidden unless $wgShowExceptionDetails is true, and $wgShowDBErrorBacktrace
+ no longer applies in such cases.
+* (bug 60960) Avoid doing file_exist() checks on data: URIs, as they cause
+ warnings to be printed on Windows due to large path length.
=== Web API changes in 1.23 ===
* (bug 54884) action=parse&prop=categories now indicates hidden and missing
* The jquery.delayedBind ResourceLoader module was deprecated in favor of the
jquery.throttle-debounce module. It will be removed in MediaWiki 1.24.
* mw.user.bucket has been deprecated.
+* On Special:PrefixIndex, a table#mw-prefixindex-list-table was changed to
+ table.mw-prefixindex-list-table to avoid duplicate ids when the special page
+ is transcluded.
+* (bug 62198) window.$j has been deprecated.
+* Preference "Disable link title conversion" was removed.
==== Removed classes ====
* FakeMemCachedClient (deprecated in 1.18)