I have the impression that site builders/admins use a different theme for the admin backend. How cool would it be to be able to preview the changes made to the layout/blocks of the frontend theme as they make changes in the UI?
Here's how Craft CMS does it with their WYSIWYG editor:

We already have a live preview in place for views and another for the color-picker, so perhaps we can abstract and reuse that.
GitHub Issue #:
986
Recent comments
The specific tags I need are "<ruby>" and "<rt>" Wow, yeah, that's a pain with CKEditor5. A custom plugin, for sure, but no clue, what the code has to look like...
Specific tags to work in CKEditor 5
I think maybe the problem is with CKEditor stripping the tags - it can be more aggressive than what you would expect from the text format settings. I copied your examples into an example page...
Specific tags to work in CKEditor 5
This saved my day, exactly what I had cooked up but I could not find the necessary settings. Thanks a bundle :)
How to relate one view to different nodes?