>There are legacy parts of browser layout that make it impossible(?) to optimize some rendering while being standards compatible. If you just chose a subset tha

>There are legacy parts of browser layout that make it impossible(?) to optimize some rendering while being standards compatible. If you just chose a subset that is fast to implement and focused on being subset you narrow the scope of the project and enable optimizations. Embedded browser engines though are either wrappers for Webkit and Blink (thus also including the "legacy parts of browser layout that make it impossible(?) to optimize some rendering") OR simplistic web rendering engines that are not as capable as Chrome/Webkit for layout and not compatible with all modern CSS/HTML features.