Thanks for the writing.
Our Markup Editor uses the rendering engine of Internet Explorer (Trident). On the other hand, our HTML-like text formatting is a custom rendering engine developed for RadControls for WinForms and providing a text styling mechanism, which can be quickly applied to all Telerik controls and their elements. It enhances one of the smallest element in the Telerik Presentation Framework - the TextPrimitive. The rich text formatting mechanism uses a few plain HTML tags to display the formatted text such as font style, font color, font size, etc. Because of this, you may expect some inconsistencies between our Markup editor and the TPF rendering engine.
Do not hesitate to contact us if you have other questions.
All the best,
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!