Existing browser engines (Chromium, WebKit, Gecko) definitely have a lot of cruft in them for compatibility purposes. An engine designed to be much lighter weight and modern would be a great fit for embedding into applications.
As opposed to writing a new engine from scratch (Servo), I wonder how feasible it would be to fork one of these existing engines and modularize its contents? The ability to start from (close to) zero and then pick and choose which features you want in your engine would be pretty attractive to lots of developers. The application that never expects to play any sort of media or access any peripherals could exclude the respective components from the build entirely.
As opposed to writing a new engine from scratch (Servo), I wonder how feasible it would be to fork one of these existing engines and modularize its contents? The ability to start from (close to) zero and then pick and choose which features you want in your engine would be pretty attractive to lots of developers. The application that never expects to play any sort of media or access any peripherals could exclude the respective components from the build entirely.