Hi Emilija,

In CMS 12 the styling configuration for the xhtmlstring changed.

This used to be set in the web.config, in CMS 12 this is set through the module.config.

<?xml version="1.0" encoding="utf-8" ?>
<module>
    <clientResources>
        <add name="epi-cms.widgets.base" path="Styles/editorStyles.css" resourceType="Style"/>
    </clientResources>
</module>

Paul

We have custom ContentAreaRenderer which had an initialization module similar to the one this link. We followed this guide for changes related to CMS 12 but  noticed that no break points are being hit in the class that defined style changes for the rich text editor. 

What we missed apparently was to add this row

services.AddTransient<ContentAreaRenderer, CUSTOMRENDERERNAME>();