mediawiki/RELEASE-NOTES-1.27
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RELEASE-NOTES-1.27
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			== MediaWiki 1.27.7 ==

			This is a maintenance release of the MediaWiki 1.27 branch.

			=== Changes since MediaWiki 1.27.6 ===
			* Add missing `use MediaWiki\MediaWikiServices;` to LogEventsList.php.
			* Remove broken tests from ApiBlockTest.php.

			== MediaWiki 1.27.6 ==

			This is a security and maintenance release of the MediaWiki 1.27 branch.

			=== Changes since MediaWiki 1.27.5 ===
			* (T204729) WatchedItemStore::countVisitingWatchersMultiple() shouldn't query all
			titles when asked for none.
			* (T109121) Remove deprecated pear/mail_mime-decode from composer suggested libraries.
			* (T207241) Augment precision of updatelist time.
			* (T207540) Include IP address in "Login for $1 succeeded" log entry.
			* (T205765) Don't link to the obsolete "Extension Matrix" page in installer.
			* (T207603) SECURITY: User JS may no longer be loaded with mime type text/javascript if
			there is no account associated with the username.
			* (T113042) SECURITY: Do not allow loading pages raw with a text/javascript MIME type if
			non-admins can edit the page.
			* (T207541) Pass email address to mail().
			* (T209335) Clarify the default sidebar 'Help' link is about MediaWiki itself.
			* (T213359) Update mediawiki/mediawiki-codesniffer to 0.8.1.
			* (T208871) The hard-coded Google search form on the database error page was
			removed.
			* (T216968) Return pageid as int in both list=iwbacklinks and list=langbacklinks.
			* (T218608) Fix an issue that prevents Extension:OAuth working when
			$wgBlockDisablesLogin is true.
			* (T219728) Added support for new Japanese era name "Reiwa".
			* (T25227) SECURITY: action=logout now requires to be posted and have a csrf token.
			* SpecialPage::checkLoginSecurityLevel() will now preserve POST data when
			reauthenticating.
			* FormSpecialPage::execute() will now call checkLoginSecurityLevel() if
			getLoginSecurityLevel() returns non-false.
			* (T197279) SECURITY: Fix reauth in Special:ChangeEmail.
			* (T208881) SECURITY: blacklist CSS var().
			* (T209794) SECURITY: rate-limit and prevent blocked users from changing email.
			* (T199540) SECURITY: API: Respect $wgBlockCIDRLimit in action=block.
			* (T212118) SECURITY: Fix cache mode for (un)patrolled recent changes query.
			* (T222036, T222038) SECURITY: Add permission check for user is permitted to
			view the log type.
			* (T221739) SECURITY: resources: Patch jQuery 1.11.3 for CVE-2019-11358.

			== MediaWiki 1.27.5 ==

			This is a security and maintenance release of the MediaWiki 1.27 branch.

			=== Changes since 1.27.4 ===
			* (T169545, CVE-2018-0503) SECURITY: $wgRateLimits entry for 'user' overrides
			'newbie'.
			* (T194605, CVE-2018-0505) SECURITY: BotPasswords can bypass CentralAuth's
			account lock.
			* Upgraded Moment.js from v2.8.4 to v2.19.3.
			* (T160298) Fixed Special:ActiveUsers due to bad backport.
			* (T87572) Make FormatMetadata::flattenArrayReal() work for an associative array.
			* Updated list of SPDX licenses for extensions.
			* (T189567) the CLI installer (maintenance/install.php) learned to detect and
			include extensions. Pass --with-extensions to enable that feature.
			* (T192584) Stop incorrectly passing USE INDEX to RecentChange::newFromConds().
			* Add default edit rate limit of 90 edits/minute for all users.
			* (T196125) php-memcached 3.0 (provided with PHP 7.0) is now supported.
			* (T196672) The mtime of extension.json files is now able to be zero.
			* (T118683) Fix exception from &$user deref on HHVM in the TitleMoveComplete hook.
			* (T180403) Validate $length in padleft/padright parser functions.
			* (T143790) Make $wgEmailConfirmToEdit only affect edit actions.
			* Special:BotPasswords now requires reauthentication.
			* (T191608, T187638) Add 'logid' parameter to Special:Log.
			* (T193829) Indicate when a Bot Password needs reset.
			* (T151415) Log email changes.
			* (T118420) Unbreak Oracle installer.

			== MediaWiki 1.27.4 ==
			This is a security and maintenance release of the MediaWiki 1.27 branch.

			=== Changes since 1.27.3 ===
			* (T100085) Better handling of jobs execution in post-connection shutdown.
			* (T141604) Support conditionally registered namespaces.
			* (T167798) Fix highlighting for phrase queries and phrase search.
			* (T151136) Provide credits information to callbacks.
			* (T160462) Allow namespaces defined in extension.json to be overwritten locally.
			* (T168856) Allow SVGs created by Dia to be uploaded.
			* (T144705) (T148662) Password reset link is no longer shown when no reset options are
			available.
			* (T143788) (T174262) Various backports for PHP 7.0 and 7.1 support.
			* (T66795) $wgUserEmailUseReplyTo is now true by default to work around restrictive DMARC
			policies.
			* DB_REPLICA constant added from REL1_28+ to ease backports to extensions and core.
			* (T175439) Unbreak Postgres Updater when setting defaults for a column.
			* (T160298) Remove use of implicitGroupBy() in ActiveUsersPager.
			* (T142304) Allow putting the app ID in the password for bot passwords.
			* Updated dev dependancy phpunit/phpunit from v4.8.24 to v4.8.36.
			* (T178451) SECURITY: Potential XSS when $wgShowExceptionDetails = false and browser
			sends non-standard url escaping.
			* (T165846) SECURITY: BotPassword login attempts weren't throttled.
			* (T128209) SECURITY: Reflected File Download from api.php.
			* (T134100) SECURITY: Do not reveal if user exists during login failure.
			* (T176247) SECURITY: Ensure Message::rawParams can't lead to XSS.
			* (T125163) SECURITY: Make anchor for headlines escape > and <.
			* (T180237) SECURITY: Protect vendor folder with .htaccess.
			* (T180231) SECURITY: Remove PHPUnit file with known RCE if exists in update.php.
			* (T124404) SECURITY: XSS in langconverter when regex hits pcre.backtrack_limit.
			* (T119158) SECURITY: Handle -{}- syntax in attributes safely.

			== MediaWiki 1.27.3 ==
			Due to a packaging error, the wrong version of the SyntaxHighlight extension was
			included in the tarball version of MediaWiki 1.27.2. The version included had a
			serious security issue in it (T158689). There was also some minor code fixes in
			MediaWiki itself since 1.27.2, but none of them were security relevant.

			=== Changes since 1.27.2 ===
			* (T145664) Fix broken wincache merge() implementation
			* (T163434) Add wikimedia/testing-access-wrapper for forwards compatibility
			* (T153505) Fix php warnings on php 7.1 due to use of &$this

			== MediaWiki 1.27.2 ==
			This is a security and maintenance release of the MediaWiki 1.27 branch.

			ApiCreateAccount was removed in 1.27.0. It was incorrectly still marked as
			deprecated (rather than already removed) in the RELEASE-NOTES at the point 1.27.0
			was released.

			=== Changes since 1.27.1 ===

			* (T68404) CSS3 attr() function with url type argument is no longer allowed
			in inline styles.
			* $wgRunJobsAsync is now false by default (T142751). This change only affects
			wikis with $wgJobRunRate > 0.
			* (T152717) Better escaping for PHP mail() command
			* Submitting the lgtoken and lgpassword parameters in the query string to
			action=login is now deprecated and outputs a warning. They should be submitted
			in the POST body instead.
			* Submitting sensitive authentication request parameters to action=clientlogin,
			action=createaccount, action=linkaccount, and action=changeauthenticationdata
			in the query string is now deprecated and outputs a warning. They should be
			submitted in the POST body instead.
			* (T158766) Avoid SQL error on MSSQL when using selectRowCount()
			* (T145635) Fix too long index error when installing with MSSQL.
			* (T156184) $wgRawHtml will no longer apply to internationalization messages.
			* (T160519) CACHE_ANYTHING will not be CACHE_ACCEL if no accelerator is installed.
			* (T109140) (T122209) SECURITY: Special:UserLogin and Special:Search allow redirect
			to interwiki links.
			* (T144845) SECURITY: XSS in SearchHighlighter::highlightText() when
			$wgAdvancedSearchHighlighting is true.
			* (T125177) SECURITY: API parameters may now be marked as "sensitive" to keep
			their values out of the logs.
			* (T150044) SECURITY: "Mark all pages visited" on the watchlist now requires a CSRF
			token.
			* (T156184) SECURITY: Escape content model/format url parameter in message.
			* (T151735) SECURITY: SVG filter evasion using default attribute values in DTD
			declaration.
			* (T161453) SECURITY: LocalisationCache will no longer use the temporary directory
			in it's fallback chain when trying to work out where to write the cache.
			* (T48143) SECURITY: Spam blacklist ineffective on encoded URLs inside file inclusion
			syntax's link parameter.
			* (T108138) SECURITY: Sysops can undelete pages, although the page is protected against
			it.

			== MediaWiki 1.27.1 ==

			This is a maintenance release of the MediaWiki 1.27 branch.

			=== Changes since 1.27.0 ===
			* BREAKING CHANGE: $wgHTTPProxy is now required for all external requests
			made by MediaWiki via a proxy. Relying on the http_proxy environment
			variable is no longer supported.
			* (T139565) SECURITY: API: Generate head items in the context of the given title
			* (T137264) SECURITY: XSS in unclosed internal links
			* (T133147) SECURITY: Escape '<' and ']]>' in inline <style> blocks
			* (T133147) SECURITY: Require login to preview user CSS pages
			* (T132926) SECURITY: Do not allow undeleting a revision deleted file if it is
			the top file
			* (T129738) SECURITY: Make $wgBlockDisablesLogin also restrict logged in
			permissions
			* (T129738) SECURITY: Make blocks log users out if $wgBlockDisablesLogin is true
			* (T115333) SECURITY: Check read permission when loading page content in ApiParse
			* (T57548) Remove support for $wgWellFormedXml = false, all output is now well formed
			* (T139670) Move 'UserGetRights' call before application of Session::getAllowedUserRights()

			== MediaWiki 1.27 ==

			=== PHP version requirement ===
			As of 1.27, MediaWiki now requires PHP 5.5.9 or higher (see Compatibility
			section). Additionally, the following PHP extensions are required:
			* ctype
			* iconv
			* json
			* mbstring (new requirement in 1.27)
			* xml
			The following PHP extensions are strongly recommended:
			* openssl

			=== Configuration changes in 1.27 ===
			* $wgAllowMicrodataAttributes and $wgAllowRdfaAttributes were removed,
			now always enabled. If you use RDFa on your wiki, you now have to explicitly
			set $wgHtml5Version to 'HTML+RDFa 1.0' or 'XHTML+RDFa 1.0'.
			* $wgUseLinkNamespaceDBFields was removed.
			* Deprecated $wgResourceLoaderMinifierStatementsOnOwnLine and
			$wgResourceLoaderMinifierMaxLineLength, because there was little value in
			making the behavior configurable. The default values (`false` for the former,
			1000 for the latter) are now hard-coded.
			* $wgDebugDumpSqlLength was removed (deprecated in 1.24).
			* $wgDebugDBTransactions was removed (deprecated in 1.20).
			* $wgUseXVO has been removed, as it provides functionality only used by
			custom Wikimedia patches against Squid 2.x that probably noone uses in
			production anymore. There is now $wgUseKeyHeader that provides similar
			functionality but instead of the MediaWiki-specific X-Vary-Options header,
			uses the draft Key header standard.
			* $wgScriptExtension (and support for '.php5' entry points) was removed. See the
			deprecation notice in the release notes for version 1.25 for advice on how to
			preserve support for '.php5' entry points via URL rewriting.
			* Password handling via the User object has been deprecated and partially
			removed, pending the future introduction of AuthManager. In particular:
			** expirePassword(), getPasswordExpireDate(), resetPasswordExpiration(), and
			getPasswordExpired() have been removed. They were unused outside of core.
			** The mPassword, mNewpassword, mNewpassTime, and mPasswordExpires fields are
			now private and will be removed in the future.
			** The getPassword() and getTemporaryPassword() methods now throw
			BadMethodCallException and will be removed in the future.
			** The ability to pass 'password' and 'newpassword' to createNew() has been
			removed. The only users of it seem to have been using it to set invalid
			passwords, and so shouldn't be greatly affected.
			** setPassword(), setInternalPassword(), and setNewpassword() have been
			deprecated, pending the introduction of AuthManager.
			** User::randomPassword() is deprecated in favor of a new method
			PasswordFactory::generateRandomPasswordString()
			** User::getPasswordFactory() is deprecated, callers should just create a
			PasswordFactory themselves.
			** A new constructor, User::newSystemUser(), has been added to simplify the
			creation of passwordless "system" users for logged actions.
			* $wgMaxSquidPurgeTitles was removed.
			* $wgAjaxWatch was removed. This is now enabled by default.
			* $wgUseInstantCommons now hotlinks Commons images by default instead of
			downloading originals and thumbnailing them locally. This allows wikis to save
			on CPU and bandwidth while reducing time to first byte for pages, even without
			a thumbnail handler. See $wgForeignFileRepos documentation for tweaks.
			* (T27397) WebP is enabled by default as an uploadable filetype.
			* (T48998) $wgArticlePath must now be either a full url, or start with a "/".
			* $wgRateLimitLog was removed; use $wgDebugLogGroups['ratelimit'] instead.
			* Deprecated API formats dbg, txt, and yaml have been removed.
			* CLDRPluralRule* classes have been replaced with
			wikimedia/cldr-plural-rule-parser.
			* Removed $wgProfilePerHost, $wgUDPProfilerHost, $wgUDPProfilerPort,
			$wgUDPProfilerFormatString, $wgStatsMethod, $wgAggregateStatsID,
			$wgStatsFormatString, and $wgProfileCallTree (deprecated since 1.20).
			* For proper operation of LocalIdLookup with shared user tables, ensure that
			$wgSharedDB and $wgSharedTables are properly set even on the "central" wiki
			that all others are sharing from and that $wgLocalDatabases is set to the
			full list of sharing wikis on all those wikis.
			* Massive overhaul to session handling:
			** $wgSessionsInObjectCache is no longer supported and must be true, due to
			MediaWiki\Session\SessionManager. $wgSessionHandler is similarly no longer
			used.
			** ObjectCacheSessionHandler is removed, replaced with
			MediaWiki\Session\PhpSessionHandler.
			** PHP session handling in general ($_SESSION, session_id(), and so on) is
			deprecated. Use MediaWiki\Session\SessionManager instead. A new config
			variable, $wgPHPSessionHandling, is available to cause use of $_SESSION to
			issue a deprecation warning or to cause most PHP session handling to throw
			exceptions.
			** Deprecated UserSetCookies hook. Session-handling extensions should generally
			be creating a custom subclass of CookieSessionProvider. Other extensions
			messing with cookies can no longer count on user data being saved in cookies
			versus other methods.
			** Deprecated UserLoadFromSession hook, extensions should create a
			MediaWiki\Session\SessionProvider.
			** The User cannot be loaded from session until after Setup.php completes.
			Attempts to do so will be ignored and the User will remain unloaded.
			** CSRF tokens may be fetched from the MediaWiki\Session\Session, which uses
			the MediaWiki\Session\Token class.
			* MediaWiki will now auto-create users as necessary, removing the need for
			extensions to do so. An 'autocreateaccount' right is added to allow
			auto-creation when 'createaccount' is not granted to all users.
			* Deprecated AuthPluginAutoCreate hook in favor of LocalUserCreated.
			* Most cookie-handling methods in User are deprecated.
			* $wgAllowAsyncCopyUploads and $CopyUploadAsyncTimeout were removed. This was an
			experimental feature that has never worked.
			* Login and createaccount tokens now vary by timestamp.
			* LoginForm::getLoginToken() and LoginForm::getCreateaccountToken()
			return a MediaWiki\Session\Token, and tokens must be checked using that
			class's methods.
			* $wgEnotifUseJobQ was removed and the job queue is always used.
			* The functionality of the ApiSandbox extension has been merged into core. The
			extension should no longer be used.
			* $wgPreloadJavaScriptMwUtil was removed (deprecated in 1.26).
			Extensions, skins, gadgets and scripts that use the mediawiki.util module must
			express a dependency on it.
			* $wgIncludeLegacyJavaScript, deprecated in MediaWiki 1.26, now defaults false.
			Extensions, skins, gadgets and scripts that need the mediawiki.legacy.wikibits
			module should express a dependency on it.
			* Removed configuration option $wgCopyrightIcon (deprecated since 1.18). Use
			$wgFooterIcons['copyright']['copyright'] instead.
			* If the openssl and mcrypt PHP extensions are both unavailable, secure
			session storage (used for login) will raise an exception. This exception may
			be bypassed by setting $wgSessionInsecureSecrets = true.
			* Massive overhaul to authentication:
			** AuthPlugin and AuthPluginUser are deprecated.
			** LoginForm and associated templates are deprecated. Extensions which called
			static LoginForm methods should be converted into authentication providers.
			** The following hooks are deprecated:
			*** AbortAutoAccount (create a MediaWiki\Auth\PreAuthenticationProvider instead)
			*** AbortLogin (create a MediaWiki\Auth\PreAuthenticationProvider instead)
			*** AbortNewAccount (create a MediaWiki\Auth\PreAuthenticationProvider instead)
			*** AddNewAccount (use LocalUserCreated instead)
			*** AuthPluginSetup (create a MediaWiki\Auth\PrimaryAuthenticationProvider instead)
			*** ChangePasswordForm (use AuthChangeFormFields instead, or security levels)
			*** LoginUserMigrated (create a MediaWiki\Auth\PreAuthenticationProvider instead)
			*** UserCreateForm (create a MediaWiki\Auth\AuthenticationProvider of some type instead)
			*** UserLoginForm (create a MediaWiki\Auth\AuthenticationProvider of some type instead)
			** The following hooks are removed:
			*** AbortChangePassword
			*** LoginPasswordResetMessage
			*** PrefsPasswordAudit
			** The UserLoginComplete hook will no longer be called for all logins, only for
			those via the web UI. Use UserLoggedIn if you need to do something on all
			logins.
			** $wgRequirePasswordforEmailChange is removed.
			* $wgWellFormedXml has been removed.

			=== New features in 1.27 ===
			* $wgDataCenterUpdateStickTTL was also added. This decides how long a user
			sticks to the primary DC (via cookies) after they make changes to the site.
			* Added a new hook, 'UserMailerTransformContent', to transform the contents
			of an email. This is similar to the EmailUser hook but applies to all mail
			sent via UserMailer.
			* Added a new hook, 'UserMailerTransformMessage', to transform the contents
			of an emai after MIME encoding.
			* Added a new hook, 'UserMailerSplitTo', to control which users have to be
			emailed separately (ie. there is a single address in the To: field) so
			user-specific changes to the email can be applied safely.
			* $wgCdnMaxageLagged was added, which limits the CDN cache TTL
			when any load balancer uses a DB that is lagged beyond the 'max lag'
			setting in the relevant section of $wgLBFactoryConf.
			* User::newSystemUser() may be used to simplify the creation of passwordless
			"system" users for logged actions from scripts and extensions.
			* Extensions can now return detailed error information via the API when
			preventing user actions using 'getUserPermissionsErrors' and similar hooks
			by using ApiMessage instances instead of strings for the $result value.
			* $wgAPIMaxLagThreshold was added to limit bot changes when databases lag
			becomes too high.
			* Skins and extensions can now use FlexBox mixins (.flex-display(@display: flex)
			and .flex(@grow: 1, @shrink: 1, @width: auto, @order: 1)) in Less to create
			cross-browser-compatible FlexBox rules. Users will still need to add fallback
			float rules or the like for compatibility with IE9- separately.
			* Added MWTimestamp::getTimezoneString() which returns the localized timezone
			string, if available. To localize this string, see the comments of
			$wgLocaltimezone in includes/DefaultSettings.php.
			* Added CentralIdLookup, a service that allows extensions needing a concept of
			"central" users to get that without having to know about specific central
			authentication extensions.
			* $wgMaxUserDBWriteDuration added to limit huge user-generated transactions.
			Regular web request transactions that takes longer than this are aborted.
			* Added a new hook, 'TitleMoveCompleting', which runs before a page move is
			committed.
			* $wgCdnReboundPurgeDelay was added to provide secondary delayed purges of URLs
			from CDN to mitigate DB replication lag and WAN cache purge lag.
			* (T49162) Installer will default to setting CACHE_ACCEL as the main cache type
			if it is available.
			* It is now possible to patrol file uploads (both for new files and new versions
			of existing files). Special:NewFiles has gained an option to filter by patrol
			status. This functionality can be disabled using $wgUseFilePatrol.
			* MediaWiki\Session infrastructure allows for easier use of session mechanisms
			other than the usual cookies.
			** SessionMetadata and SessionCheckInfo hooks allow for setting and checking
			custom session metadata.
			* Added MWGrants and associated configuration settings $wgGrantPermissions and
			$wgGrantPermissionGroups to hold configuration for authentication features
			such as OAuth that want to allow restricting the user rights a user may make
			use of.
			** If you're already using the OAuth extension, these new variables are
			identical to (and will replace) $wgMWOAuthGrantPermissions and
			$wgMWOAuthGrantPermissionGroups.
			* Added MWRestrictions as a class to check restrictions on a WebRequest, e.g.
			to assert that the request comes from a particular IP range.
			* Added bot passwords, a rights-restricted login mechanism for API-using bots.
			* Whitelisted the following HTML attributes for all elements in wikitext:
			aria-describedby, aria-flowto, aria-label, aria-labelledby, aria-owns.
			* Removed "presentation" restriction on the HTML role attribute in wikitext.
			All values are now allowed for the role attribute.
			* $wgContentHandlers now also supports callbacks to create an instance of the
			appropriate ContentHandler subclass.
			* Added $wgAuthenticationTokenVersion, which if non-null prevents the
			user_token database field from being exposed in cookies. Setting this would
			be a good idea, but will log out all current sessions.
			* $wgEventRelayerConfig was added, for managing PubSub event relay configuration,
			specifically for reliable CDN url purges.
			* Requests have unique IDs, equal to the UNIQUE_ID environment variable (when
			MediaWiki is behind Apache+mod_unique_id or something similar) or a randomly-
			generated 24-character string. This request ID is used to annotate log records
			and error messages. It is available client-side via mw.config.get( 'wgRequestId' ).
			The request ID supplants exception IDs. Accordingly, MWExceptionHandler::getLogId()
			is deprecated.
			* (T33313) Add a preference for watching uploads by default, also applies
			to API-based upload tools.
			* $wgJpegPixelFormat was added to override chroma subsampling for JPEG image
			thumbnails created via ImageMagick. Defaults to 'yuv420', providing bandwidth
			savings versus the previous behavior on many files.
			* MediaWiki\Auth infrastructure (called "AuthManager") allows for more flexible
			configuration of multiple authentication pieces that was possible with
			AuthPlugin. For example, it's now easy to plug in second-factor
			authentication, or add additional checks to the login process, or to support
			multiple login methods at once, or to support non-password-based login methods.
			** Providers are configured via the global setting $wgAuthManagerConfig.
			** New hook, AuthChangeFormFields, to adjust the form fields on
			AuthManager-related special pages.
			** New hook, AuthManagerLoginAuthenticateAudit, for additional logging of
			AuthManager-related authentication requests.
			** New hook, ChangeAuthenticationDataAudit, for additional logging of
			AuthManager-related authentication data changes.
			** New hook, SecuritySensitiveOperationStatus, to work with the new mechanism
			for requiring a recent login before taking security-sensitive operations
			like changing a password.
			** Two new globals, $wgChangeCredentialsBlacklist and $wgRemoveCredentialsBlacklist
			can be used to prevent the web UI and the API changing certain authentication data.
			* The file upload dialog (available if you install WikiEditor or VisualEditor)
			can now be configured using $wgUploadDialog.

			=== External library changes in 1.27 ===

			==== Upgraded external libraries ====
			* Updated oojs/oojs-ui from v0.12.12 to v0.13.3.
			* Updated composer/semver from v1.0.0 to v1.2.0.
			* Updated liuggio/statsd-php-client to 1.0.18.
			* Updated QUnit from v1.18.0 to v1.22.0.

			==== New external libraries ====
			* Added wikimedia/base-convert v1.0.1.
			* Added wikimedia/cldr-plural-rule-parser v1.0.0.
			* Added wikimedia/relpath v1.0.3.
			* Added wikimedia/running-stat v1.1.0.
			* Added wikimedia/php-session-serializer v1.0.3.

			==== Removed and replaced external libraries ====

			=== Bug fixes in 1.27 ===
			* Special:Upload will now display correct maximum allowed file size when running
			under HHVM (T116347).
			* (T54077) The APIEditBeforeSave hook will once again give only the content of
			the section being edited, rather than the whole revision. This reverts the
			change made in MediaWiki 1.22.

			=== Action API changes in 1.27 ===
			* Added list=allrevisions.
			* generator=recentchanges now has the option to generate revids.
			* ApiPageSet::setRedirectMergePolicy() was added. This allows generator
			modules to define how generator data for a redirect source gets merged
			into the redirect destination.
			* prop=imageinfo&iiprop=uploadwarning will no longer include the possibility of
			"was-deleted" warning.
			* Added difftotextpst to query=revisions which preforms a pre-save transform on
			the text before diffing it.
			* Deprecated formats dbg, txt, and yaml have been removed.
			* (T47988) The protect log event details now use new-style formatting.
			* The following response properties from action=login are deprecated, and may
			be removed in the future: lgtoken, cookieprefix, sessionid. Clients should
			handle cookies to properly manage session state.
			* action=login transparently allows login using bot passwords. Clients should
			merely need to change the username and password used after setting up a bot
			password.
			* action=upload no longer understands statuskey, asyncdownload or leavemessage.
			* action=login is deprecated for uses other than bot passwords.
			* list=users can now indicate if a missing username is creatable.
			* action=createaccount is changed in a non-backwards-compatible manner.
			* Added action=query&meta=authmanagerinfo.
			* Added action=clientlogin to be used to log into the main account instead of
			action=login.
			* Added action=linkaccount.
			* Added action=unlinkaccount.
			* Added action=changeauthenticationdata.
			* Added action=removeauthenticationdata.
			* Added action=resetpassword.
			* (T125177) SECURITY: API parameters may now be marked as "sensitive" to keep
			their values out of the logs.

			=== Action API internal changes in 1.27 ===
			* ApiQueryORM removed.
			* The following classes have been removed:
			** ApiFormatDbg
			** ApiFormatTxt
			** ApiFormatYaml
			* ApiBase::addTokenProperties() was removed (deprecated since 1.24).
			* ApiBase::getFinalPossibleErrors() was removed (deprecated since 1.24).
			* ApiBase::getFinalResultProperties() was removed (deprecated since 1.24).
			* ApiBase::getRequireAtLeastOneParameterErrorMessages() was removed (deprecated since 1.24).
			* ApiBase::getPossibleErrors() was removed (deprecated since 1.24).
			* ApiBase::getRequireMaxOneParameterErrorMessages() was removed (deprecated since 1.24).
			* ApiBase::getRequireOnlyOneParameterErrorMessages() was removed (deprecated since 1.24).
			* ApiBase::getResultProperties() was removed (deprecated since 1.24).
			* ApiBase::getTitleOrPageIdErrorMessage() was removed (deprecated since 1.24).
			* ApiBase::parseErrors() was removed (deprecated since 1.24).
			* ApiQueryBase::titleToKey(), ApiQueryBase::keyToTitle() and
			ApiQueryBase::keyPartToTitle() all removed (deprecated since 1.24).
			* ApiQueryBase::checkRowCount() was removed (deprecated since 1.24).
			* ApiQueryBase::getDirectionDescription() was removed (deprecated since 1.25).
			* ApiQuery::getGenerators() was removed (deprecated since 1.21).
			* ApiQuery::getModules() was removed (deprecated since 1.21).
			* ApiQuery::getModuleType() was removed (deprecated since 1.21).
			* ApiQuery::setGeneratorContinue() was removed (deprecated since 1.24).
			* ApiMain::getModules() was removed (deprecated since 1.21).
			* ApiBase::getVersion() was removed (deprecated since 1.21).
			* ApiMain::getShowVersions() was removed (deprecated in 1.21).
			* ApiMain::addModule() was removed (deprecated in 1.21).
			* ApiMain::addFormat() was removed (deprecated in 1.21).
			* ApiMain::getFormats() was removed (deprecated in 1.21).
			* ApiPageSet::finishPageSetGeneration() was removed (deprecated in 1.21).
			* ApiCreateAccount was removed.

			=== Languages updated in 1.27 ===

			MediaWiki supports over 350 languages. Many localisations are updated
			regularly. Below only new and removed languages are listed, as well as
			changes to languages because of Phabricator reports.

			* (T113688) Change default numerals from Gurmukhi to Arabic for Punjabi locale.
			* (T116020) Aliases of magic words in MessagesXx.php are sorted by usage.

			=== Other changes in 1.27 ===
			* Added dependency injection (DI) infrastructure, see docs/injection.txt for details.
			It is planned to incrementally move MediaWiki code towards using DI, using the
			service locator (SL) pattern as a stepping stone.
			* ProfilerOutputUdp was removed. Note that there is a ProfilerOutputStats class.
			* WikiPage::doDeleteArticleReal() and WikiPage::doDeleteArticle() now
			ignore the 2nd and 3rd arguments (formerly $id and $commit).
			* Removed "loaderScripts" option from ResourceLoaderFileModule class.
			* Removed ORM-like wrapper added in 1.20.
			* LinkCache::getGoodLinks and LinkCache::getBadLinks were removed
			(deprecated in 1.26).
			* WikiPage::doQuickEdit() was removed (deprecated since 1.21).
			* Removed SiteObject and SiteArray classes (deprecated in 1.21).
			* MessageBlobStore::getInstance() was removed (deprecated since 1.25).
			* (T84937) Free external links ("autolinked" urls) will now be terminated
			by   and HTML entity encodings of &nbsp, <, and >.
			* (T36948) The default file revert message's timestamp is now in
			$wgLocaltimezone, instead of UTC.
			* The default name of the 'suppress' group page has been changed from
			'Project:Oversight' to 'Project:Suppress'.
			* DatabaseBase::resultObject() is now protected (use outside Database classes
			not necessary since 1.11).
			* Calling ResourceLoaderFileModule::readStyleFiles() without a
			ResourceLoaderContext instance is deprecated.
			* ResourceLoader::getLessCompiler() now takes an optional parameter of
			additional LESS variables to set for the compiler.
			* wfBaseConvert() marked as deprecated, use Wikimedia\base_convert() directly
			instead.
			* Obsolete maintenance scripts clearCacheStats.php and showCacheStats.php
			were removed. The underlying data is sent to StatsD (see $wgStatsdServer).
			* Removed msg_resource_links database table and associated code.
			* Removed msg_resource database table and associated code.
			* Skin::getNamespaceNotice() was removed.
			* wfIsConfiguredProxy() was removed (deprecated since 1.24).
			* wfDebugTimer() was removed (deprecated since 1.25).
			* wfIsTrustedProxy() was removed (deprecated since 1.24).
			* wfGetIP() was removed (deprecated since 1.19).
			* MWHookException was removed.
			* OutputPage::appendSubtitle() was removed (deprecated since 1.19).
			* OutputPage::loginToUse() was removed (deprecated since 1.19).
			* Article::loadContent() was removed (deprecated since 1.19).
			* User::editToken() was removed (deprecated since 1.19).
			* Removed --force-normal option of dumpBackup.php, as it no longer served
			any useful purpose since 1.22.
			* The functions processOption() and processArgs() on the BackupDumper and
			TextPassDumper classes have been removed.
			* The maintenance/backupTextPass.inc file was deleted. You should include
			maintenance/dumpTextPass.php instead.
			* WikiPage::getUsedTemplates() was removed (deprecated since 1.19).
			* wfEmptyMsg() was removed (deprecated since 1.18).
			* OutputPage::permissionRequired() was removed (deprecated since 1.18).
			* OutputPage::blockedPage() was removed (deprecated since 1.18).
			* User::getSkin() was removed (deprecated since 1.18).
			* OutputPage::includeJQuery() was removed (deprecated since 1.17).
			* WikiPage::updateRestrictions() was removed (deprecated since 1.19).
			* WikiPage::testPreSaveTransform() was removed (deprecated since 1.19).
			* LogPage::logName() was removed (deprecated since 1.19).
			* LogPage::logHeader() was removed (deprecated since 1.19).
			* wfCheckLimits() was removed (deprecated since 1.24).
			* Linker::makeKnownLinkObj() was removed (deprecated since 1.16).
			* Linker::makeLinkObj() was removed (deprecated since 1.16).
			* wfMsgForContentNoTrans() was removed (deprecated since 1.18).
			* ChangesList::usePatrol was removed (deprecated since 1.22).
			* wfMsgNoTrans() was removed (deprecated since 1.18).
			* Linker::makeImageLink2 was removed (deprecated since 1.20).
			* Title::userIsWatching() was removed (deprecated since 1.20).
			* Removed WaitForSlave maintenance script; use SELECT MASTER_POS_WAIT()
			database function directly instead.
			* wfMsg() was removed (deprecated since 1.18).
			* wfMsgForContent() was removed (deprecated since 1.18).
			* wfMsgReal() was removed (deprecated since 1.18).
			* wfMsgGetKey() was removed (deprecated since 1.18).
			* wfMsgHtml() was removed (deprecated since 1.18).
			* wfMsgWikiHtml() was removed (deprecated since 1.18).
			* wfMsgExt() was removed (deprecated since 1.18).
			* Language::armourMath() was removed (deprecated since 1.22).
			* LanguageConverter::armourMath() was removed (deprecated since 1.22).
			* FakeConverter::armourMath() was removed (deprecated since 1.22).
			* The unused jquery.validate ResourceLoader module was removed.
			* FileRepo::getRootUrl() was removed (deprecated since 1.20).
			* User::generateToken() was removed (deprecated since 1.20).
			* WikiPage::getRawText() was removed (deprecated since 1.21).
			* ParserOutput::hasCustomDataUpdates() was removed (deprecated since 1.25).
			* ParserOutput::addSecondaryDataUpdate() was removed (deprecated since 1.25).
			* ParserOutput::getSecondaryDataUpdates() was removed (deprecated since 1.25).
			* Gallery images with multiple caption pipes no longer concatenate them all
			together but instead pick the final one, similar to image syntax.
			* XML-like parser tags (such as <gallery>), when unclosed, will be left unparsed
			rather than consume everything until the end of the page.
			* New maintenance script resetUserEmail.php allows sysadmins to reset user emails in case
			a user forgot password/account was stolen.
			* wfCheckEntropy() was removed (deprecated in 1.27).
			* Browser support for Internet Explorer 8 lowered from Grade A to Grade C.
			* ContentHandler::supportsCategories method added. Default is true.
			CategoryMembershipChangeJob updates are skipped for content that
			does not support categories.
			* wikidiff difference engine is no longer supported, anyone still using it are encouraged
			to upgrade to wikidiff2 which is actively maintained and has better package availability.
			* Database logic was removed from WatchedItem and a WatchedItemStore was created:
			** WatchedItem::IGNORE_USER_RIGHTS and WatchedItem::CHECK_USER_RIGHTS were deprecated.
			User::IGNORE_USER_RIGHTS and User::CHECK_USER_RIGHTS were introduced.
			** WatchedItem::fromUserTitle was deprecated in favour of the constructor.
			** WatchedItem::resetNotificationTimestamp was deprecated.
			** WatchedItem::batchAddWatch was deprecated.
			** WatchedItem::addWatch was deprecated.
			** WatchedItem::removeWatch was deprecated.
			** WatchedItem::isWatched was deprecated.
			** WatchedItem::duplicateEntries was deprecated.
			** EmailNotification::updateWatchlistTimestamp was deprecated.
			** User::getWatchedItem was removed.
			* Unit tests don't work with external PHPUnit anymore, Composer is now the only supported
			way. Run `composer install` to install it and other dev dependencies to run unit tests.
			* wl_id field added to the watchlist table.
			* Revision::getRawText() was removed (deprecated since 1.21).
			* WikiPage::replaceSection() was removed (deprecated since 1.21).
			* Article::replaceSection() was removed (deprecated since 1.21).
			* Language::getLangObj() was removed (deprecated since 1.24).
			* Language::getLanguageName() was removed (deprecated since 1.20).
			* Language::getLanguageNames() was removed (deprecated since 1.20).
			* Language::getTranslatedLanguageNames() was removed (deprecated since 1.20).
			* Language::specialPage() was removed (deprecated since 1.24).
			* MediaWikiTestCase::assertException() was removed (deprecated since 1.22).
			* OutputPage::getHeadItems() was removed (deprecated since 1.24).
			* OutputPage::getScript() was removed (deprecated since 1.24).
			* OutputPage::out() was removed (deprecated since 1.22).
			* OutputPage::setAllowedModules() was removed (deprecated since 1.24).
			* UserrightsPage::makeGroupNameListForLog() was removed (deprecated since 1.21).
			* MediaWikiSite::newFromGlobalId() was removed (deprecated since 1.21).
			* Title::newFromRedirect() was removed (deprecated since 1.21).
			* Skin::commonPrintStylesheet() was removed (deprecated since 1.22).
			* Skin::getCommonStylePath() was removed (deprecated since 1.24).
			* Skin::newFromKey() was removed (deprecated since 1.24).
			* Skin::getUsableSkins() was removed (deprecated since 1.23).
			* LoadBalancer::pickRandom() was removed (deprecated in 1.21).
			* Article::getUndoText() and WikiPage::getUndoText were removed (deprecated since
			1.21).
			* DifferenceEngine::setText() was removed (deprecated in 1.21).
			* Title::newFromRedirectArray() was removed (deprecated in 1.21).
			* UserMailer::send() no longer accepts $replyto as the 5th argument and $contentType
			as the 6th. These must be passed in the options array now.
			* Title::newFromRedirectRecurse() was removed (deprecated in 1.21).
			* Skin::accesskey was removed (deprecated since 1.21).
			* Skin::blockLink was removed (deprecated since 1.21).
			* Skin::buildRollbackLink was removed (deprecated since 1.21).
			* Skin::emailLink was removed (deprecated since 1.21).
			* Skin::formatComment was removed (deprecated since 1.21).
			* Skin::formatHiddenCategories was removed (deprecated since 1.21).
			* Skin::formatLinksInComment was removed (deprecated since 1.21).
			* Skin::formatRevisionSize was removed (deprecated since 1.21).
			* Skin::formatSize was removed (deprecated since 1.21).
			* Skin::formatTemplates was removed (deprecated since 1.21).
			* Skin::generateTOC was removed (deprecated since 1.21).
			* Skin::getInternalLinkAttributes was removed (deprecated since 1.21).
			* Skin::getInternalLinkAttributesObj was removed (deprecated since 1.21).
			* Skin::getInterwikiLinkAttributes was removed (deprecated since 1.21).
			* Skin::getInvalidTitleDescription was removed (deprecated since 1.21).
			* Skin::getLinkColour was removed (deprecated since 1.21).
			* Skin::getRevDeleteLink was removed (deprecated since 1.21).
			* Skin::getRollbackEditCount was removed (deprecated since 1.21).
			* Skin::makeBrokenImageLinkObj was removed (deprecated since 1.21).
			* Skin::makeCommentLink was removed (deprecated since 1.21).
			* Skin::makeExternalImage was removed (deprecated since 1.21).
			* Skin::makeExternalLink was removed (deprecated since 1.21).
			* Skin::makeHeadline was removed (deprecated since 1.21).
			* Skin::makeImageLink was removed (deprecated since 1.21).
			* Skin::makeMediaLinkFile was removed (deprecated since 1.21).
			* Skin::makeMediaLinkObj was removed (deprecated since 1.21).
			* Skin::makeSelfLinkObj was removed (deprecated since 1.21).
			* Skin::makeThumbLink2 was removed (deprecated since 1.21).
			* Skin::makeThumbLinkObj was removed (deprecated since 1.21).
			* Skin::normaliseSpecialPage was removed (deprecated since 1.21).
			* Skin::normalizeSubpageLink was removed (deprecated since 1.21).
			* Skin::processResponsiveImages was removed (deprecated since 1.21).
			* Skin::revComment was removed (deprecated since 1.21).
			* Skin::revDeleteLink was removed (deprecated since 1.21).
			* Skin::revDeleteLinkDisabled was removed (deprecated since 1.21).
			* Skin::revUserLink was removed (deprecated since 1.21).
			* Skin::revUserTools was removed (deprecated since 1.21).
			* Skin::specialLink was removed (deprecated since 1.21).
			* Skin::splitTrail was removed (deprecated since 1.21).
			* Skin::titleAttrib was removed (deprecated since 1.21).
			* Skin::tocIndent was removed (deprecated since 1.21).
			* Skin::tocLine was removed (deprecated since 1.21).
			* Skin::tocLineEnd was removed (deprecated since 1.21).
			* Skin::tocList was removed (deprecated since 1.21).
			* Skin::tocUnindent was removed (deprecated since 1.21).
			* Skin::tooltip was removed (deprecated since 1.21).
			* Skin::tooltipAndAccesskeyAttribs was removed (deprecated since 1.21).
			* Skin::userTalkLink was removed (deprecated since 1.21).
			* Skin::userToolLinksRedContribs was removed (deprecated since 1.21).
			* wikidiff3 is now the default and only PHP diff engine. It provides improved diff
			performance on complex changes. $wgExternalDiffEngine = 'wikidiff3' therefore
			makes no difference now. Users are still recommended to use wikidiff2 if possible,
			though.
			* User::addNewUserLogEntry() was deprecated.
			* User::addNewUserLogEntryAutoCreate() was deprecated.
			* User::isPasswordReminderThrottled() was deprecated.
			* Bot-oriented parameters to Special:UserLogin (wpCookieCheck, wpSkipCookieCheck)
			were removed.
			* Installer can now be customized without patching MediaWiki code, see
			mw-config/overrides/README for details.

			== Compatibility ==

			MediaWiki 1.27 requires PHP 5.5.9 or later. There is experimental support for
			HHVM 3.6.5 or later.

			MySQL is the recommended DBMS. PostgreSQL or SQLite can also be used, but
			support for them is somewhat less mature. There is experimental support for
			Oracle and Microsoft SQL Server.

			The supported versions are:

			* MySQL 5.0.3 or later
			* PostgreSQL 8.3 or later
			* SQLite 3.3.7 or later
			* Oracle 9.0.1 or later
			* Microsoft SQL Server 2005 (9.00.1399)

			== Upgrading ==

			1.27 has several database changes since 1.26, and will not work without schema
			updates. Note that due to changes to some very large tables like the revision
			table, the schema update may take quite long (minutes on a medium sized site,
			many hours on a large site).

			If upgrading from before 1.11, and you are using a wiki as a commons
			repository, make sure that it is updated as well. Otherwise, errors may arise
			due to database schema changes.

			If upgrading from before 1.7, you may want to run refreshLinks.php to ensure
			new database fields are filled with data.

			If you are upgrading from MediaWiki 1.4.x or earlier, you should upgrade to
			1.5 first. The upgrade script maintenance/upgrade1_5.php has been removed
			with MediaWiki 1.21.

			Don't forget to always back up your database before upgrading!

			See the file UPGRADE for more detailed upgrade instructions.

			For notes on 1.26.x and older releases, see HISTORY.

			== Online documentation ==

			Documentation for both end-users and site administrators is available on
			MediaWiki.org, and is covered under the GNU Free Documentation License (except
			for pages that explicitly state that their contents are in the public domain):

			https://www.mediawiki.org/wiki/Documentation

			== Mailing list ==

			A mailing list is available for MediaWiki user support and discussion:

			https://lists.wikimedia.org/mailman/listinfo/mediawiki-l

			A low-traffic announcements-only list is also available:

			https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce

			It's highly recommended that you sign up for one of these lists if you're
			going to run a public MediaWiki, so you can be notified of security fixes.

			== IRC help ==

			There's usually someone online in #mediawiki on irc.freenode.net.

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