how can I get html without additional prefix fr-original?

[meicx]

I have use this.editor.html.get() to get html content but I find all class in html tag has changed to fr-original-class, how can I get the original html?

I have found _original_html in this.editor but it is empty:

[stefanneculai]

The original attributes are being added in order to be able to revert back the HTML at the moment you have the useClasses option disabled. If you would like to remove them, then you could be either enable the useClasses option or filter the result and remove them. With the 2nd approach you should consider the fact that you might not be getting the same editing experience if you put the editor ouput back in the editor.