Board Thread:JS and CSS Support/@comment-34804319-20190130154754/@comment-26497423-20190130195047

Gotcha, you don't need to add  after each article import, so instead of u:dev:MediaWiki:FandomizedCommunityRail/code.css&only=styles|u:dev:MediaWiki:FandomizedActivityFeed.css&only=styles you can just do u:dev:MediaWiki:FandomizedCommunityRail/code.css|u:dev:MediaWiki:FandomizedActivityFeed.css and keep the  at the end of the import

If you want some more explanation as to why this is, it's all one request so you only need to specify to only include styles once, so the parameters on the request are
 * mode which is pretty much always articles
 * only which can be either styles or scripts
 * and articles which is a pipe separated list of article paths, which are formed as

Hope it helps