I'm sorry to piss on your parade but xwidget is terrible. First, webkit (with no protections) running inside Emacs is a security disaster. Second, GTK is a pile of steaming shit, has memory leaks and causes Emacs crashes on Linux. People on #emacs are recompiling without GTK toolkit support in order to make Emacs stable. GTK on Windows and OSX is even worse. I'm laughing just thinking about the unholy clusterfuck that will be someone trying this on these platforms. Third, Joakim Verona, the author of xwidget patch, is a clueless academic. His code stinks, just take a look at the source and tell me you'd be comfortable running that garbage inside your Emacs. I'm extremely disappointed that Eli merged this vomit and even more, that somebody actually thought GTK widgets inside Emacs is a good idea, especially when everyone is migrating away from GTK and treating it like a leper.