There is no initial / base browser that we build our controls on - while they are being developed, they are tested and tuned for all major browsers. As for RadEditor, every browser has its own engine for RichText editing and the editor uses that functionality. At present, our main concern is to have XHTML compliant output across all major browsers. We are also working on the Identical output in different browsers but at this point I cannot give you an exact time frame.
All the best,
the Telerik team
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