* HTMLForm mutators can now be chained (they return $this)
* A new message, "api-error-filetype-banned-type", is available for formatting
API upload errors due to the file extension blacklist.
-* jsMessage: Redesigned in Vector/Monobook as floating bubble with auto-hide.
* New hook 'ParserTestGlobals' allows to set globals before running parser tests.
* Allow importing pages as subpage.
* Add lang and hreflang attributes to language links on Login page.
* Added ResourceLoader module "jquery.badge".
* mw.util.$content now points to the overall content area in the skin rather than just
page text content area. If you need the old behaviour please use $( '#mw-content-text').
+* jsMessage has been replaced with a floating bubble notification system complete
+ with auto-hide, multi-message support, and message replacement tags.
+* jquery.messageBox which appears to be unused by both core and extensions has
+ been removed.
=== Bug fixes in 1.20 ===
* (bug 30245) Use the correct way to construct a log page title.