Hello Sumit,
As it is explained in the mentioned help article each browser has preset default font decoration for the editable content. In the following KB article you can find detailed explanation on some specific scenarios and solutions:
No FONT tags are applied when I type text in the editor
You can use the following code solution to wrap the initial content or the empty content of RadEditor in a span tag with Calibri 12px, e.g.
You can modify the values depending on your requirements. This could be helpful for your scenario.
Best regards,
Rumen
the Telerik team
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