In multisite scenarios or when you use optimization libraries you’ll need to set the TinyMCE editor css dynamically from the code.
I’ve experience that it can be tricky setting up content provider. Content Providers in EPiServer is a way of publishing external data as pages/blocks etc. Here is an example of an RSS Content Provider.
Sometimes you want to customize your mirrored content, in this example I can customize the url segment, setting the ACLs, and localization. And we do use Fetchdata.
Content Providers in EPiServer is a way of publishing external data as pages/blocks etc… but also a way of publishing content in several places on your web.