We already use cairo/freetype/skia to do essentially all the document rendering in software (not for the Qt prototype though), so that's not a big leap to get t

We already use cairo/freetype/skia to do essentially all the document rendering in software (not for the Qt prototype though), so that's not a big leap to get that blitted out. Incrementally then using more of html canvas to speed things up might be next. Most of the work is going to be having the GUI (toolbar/notebook bar, menues, sidebar, dialogs) browser-native of course.