This thing HAS existed for a while (CEF/Electron, Awesomium, QtWebKit, GTKWebKit, etc.) but the size, memory usage, and flexibility has always been prohibitive.

This thing HAS existed for a while (CEF/Electron, Awesomium, QtWebKit, GTKWebKit, etc.) but the size, memory usage, and flexibility has always been prohibitive. Ultralight addresses all of those through a new, lightweight WebKit fork geared specifically for embedding in other apps. This is a major rewrite and has taken 4+ years to complete. I am the former creator of Awesomium and decided to tackle this issue myself. Also, the library does come with a DOM implementation and most existing JS libraries work just fine.