Wikimedia Bugzilla is closed!

Wikimedia migrated from Bugzilla to Phabricator. Bug reports are handled in Wikimedia Phabricator.
This static website is read-only and for historical purposes. It is not possible to log in and except for displaying bug reports and their history, links might be broken. See T35346, the corresponding Phabricator task for complete and up-to-date bug report information.

http://www.mediawiki.org/wiki/ResourceLoader/Migration_guide_for_extension_developers

No mention of lrt/rtl flipping or how to avoid flash of unstyled content.

Kick-start:

https://www.mediawiki.org/w/index.php?title=ResourceLoader%2FDeveloping_with_ResourceLoader&action=historysubmit&diff=474777&oldid=432623

* https://www.mediawiki.org/wiki/ResourceLoader/Developing_with_ResourceLoader
* https://www.mediawiki.org/wiki/ResourceLoader/Features

And in particular:
* https://www.mediawiki.org/wiki/ResourceLoader/Features#Flipping
* https://www.mediawiki.org/wiki/ResourceLoader/Developing_with_ResourceLoader#Annotations
* https://www.mediawiki.org/wiki/ResourceLoader/Developing_with_ResourceLoader#Module_structure