Rossi shed more light on how Microsoft plans to deliver a new Spartan Web browser while also permitting organizations dependent on older Internet Explorer technologies to retain compatibility with their legacy Web apps and intranet sites.
The Spartan browser will have a new rendering engine, called "EdgeHTML," which is the result of Microsoft forking of the Trident engine code used for Internet Explorer. Spartan will contain both engines, the new EdgeHTML one as well as the legacy Trident engine called "MSHTML" (see chart)