By default RadEditor will not add such formatting to your content. I am at a loss how to reproduce your problem. I tested with your RadEditor declaration and I was not able to reproduce the problem.
I also experimented with adding some global CSS on the page to see if it will cause the issue to manifest itself:
p, span, body
It did not make any difference.
It must be something in your page in addition to the RadEditor declaration that causes this behavior to happen. It is also possible if your original first line of content was pasted from somewhere else - e.g. MS Word.
Are you able to reproduce the problem in more than one browser (e.g. not just in IE, but FF as well)?
Can you send us a simple runnable project that reproduces the problem as well as steps to reproduce it?
On a side note, to remove such undesired content you can attach to the editor's onsubmit event and go through the DOM, e.g. something like this:
| var span = editor.get_document().getElementsByTagName("SPAN");
| for (var i=0; i< spans.length;i++)
| spans[i].style.backgroundColor = "";
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.