Dear Kendo-Supportteam,

We are experiencing an issue with the Editor component.

It turns out that setting the iframe input to false causes the paste event to be triggered twice.
Once as documented before the valueChange event and once seemingly as the native paste event after valueChange.

There are multiple issues resulting from this.

1. Calling preventDefault on the initial event also does NOT prevent the native event from triggering directly after. Only the following events from the Editor itself are prevented.
2. As the next event is the actual native event of type ClipboardEvent, the interface is different from what the type definitions suggest. Leading to errors, if the attached method tries to just call isDefaultPrevented on the event.

It is quite easy to reproduce this from your event demonstration examples by just setting the iframe input to false and maybe also trying to call isDefaultPrevented in the respective paste event handler.

Kind Regards,
Hannah