Thank you for contacting us!
The behavior which you have experienced is a known one. Telerik RadRichTextBox currently does not support table’s styles editing of an imported HTML document.
This is already added to our to-do list but I cannot say when it might be implemented. The preferences and demands of our clients are highly valued when determining our roadmap for future releases.
If you have any comments or other questions, do not hesitate to contact us again.
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