User blog comment:DaNASCAT/Update Your CSS and JavaScript To Speed Up Your Wiki/@comment-3508190-20120901063931/@comment-166269-20120912183711

While it's cool to hear you guys're adding support for redirects, that wasn't the problem here: when I was originally trying to add this, the problematic stylesheet was located at "MediaWiki:OldInfoboxStyle.css", and there wasn't anything (not even a redirect) located at "MediaWiki:Oldinfoboxstyle.css". Therefore, when Pecoes had me try loading the nonexistent CSS, ResourceLoader simply skipped it instead of loading the broken CSS and causing browsers to choke on it. Deltaneos fixed the broken stylesheet and moved it to the lowercase title a few days later, at which point (assuming proper browser cache clearage) it would have started having an effect, without breaking things. As I explained previously, the reason it appeared to work in the time between telling ResourceLoader to load the nonexistent CSS and the time Deltaneos fixed the actual CSS and moved it to that title, is because it is an older version of some of w:c:enanimanga:MediaWiki:Anime-Common.css, which picked up the slack (yes, that very last bit was a straight copy-paste from my previous comment on this).