Thank you for the clarification.
I understand what you want, but currently this is not supported by the export to HTML functionality of RadGridView. I am happy, though, to inform you that this functionality will be added in our upcoming service pack, which is due at some point this month. We will also add functionality to handle the cell text wrapping which originates from the fact that you can set different column widths and text wrapping should also be handled.
I hope you will find the new functionality useful. If you have other questions or feedback, we would love to hear it.
the Telerik team