+* Removed ParserOptions::setSkin(). (deprecated since 1.19)
+* Removed Title::escapeCanonicalURL(). (deprecated since 1.19)
+* Removed Title::escapeLocalURL(). (deprecated since 1.19)
+* Removed Title::escapeFullURL(). (deprecated since 1.19)
+* Removed User::isValidEmailAddr(). (deprecated since 1.18)
+* Removed Title::getEscapedText(). (deprecated since 1.19)
+* Removed Language::getFallbackLanguageCode(). (deprecated since 1.19)
+* Removed WikiPage::isBigDeletion(). (deprecated since 1.19)
+* Removed MWInit class which contained functions related to a now discontinued
+ PHP compiler called hphpc. (deprecated since 1.22)
+* ApiResult::enableSizeCheck() and disableSizeCheck() are now obsolete.
+* Removed ResourceLoaderGetStartupModules hook. (deprecated since 1.23)
+* Removed getFormFields(), onSubmit() and onSuccess() from FormlessAction, as
+ these were meant specifically for FormAction instead.
+* Removed Action::execute().
+* Removed AjaxAddScript which has been obsolete since ResourceLoader and
+ is unused by any modern extension.