Hello,
There are two approaches that you can try:
1) The first one is to define a global CSS Class for table or td elements and apply it to the content area. See these resources for more information:
Customize Content Area
and
Setting Content Area Defaults
2) The other option is to attach to the
OnClientPasteHtml event and modify the content inserted via the InsertTable and TableWizard tools.
Kind regards,
Rumen
the Telerik team
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