Thread:Extension talk:WYSIWYG/MW 1.24 WYSIWYG/FCKeditor V4 : allowedContent(ACF) cannot be updated for new buttons/plugins/reply

I noticed the same problem with disallowedContent that seems to be bypassed (See below in "How to strip unwanted styles"). It is not really surprising since WYSIWYG integration into Mediawiki changes the way text is parsed. I found a custom way to remove more tags, but I have no idea about how to prevent WYSIWYG to remove tags...