By default, RadEditor has enabled built-in filters - RemoveScripts and EncodeScripts
which remove any script tags from the content to prevent Cross-Server-Script attacks. In order to allow execution of scripts inside RadEditor content area you need to disable these content filters, e.g.:
Also, you need to set RadEditor to work in Full HTML Edit mode. Please find how to achieve this in the following live demo:
Editor / Full HTML Page Edit
Please note that such modification is highly not recommended.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items