ms-rteElement not working from Azure CDN

Question

I've put some of our CSS and JavaScript files on Azure storage. These files are used across different websites. The problem is SharePoint seems to ignore ms-rteElement and rteStyle styles when the files are coming from a remote server. They don't appear in the ribbon.

Is it possible to use rteElement and rteStyle on a remotely hosting css file? If not, why doesn't it work?

Answer 1

The solution we came up with is to have a local css file with just the -ms-name property.

/* Contact Style */
p.ms-rteElement-contact
{
    -ms-name: "Contact";
}