AwwsomThis feature can access local resource(fs etc..)?
sure, you can use gio api to access files.
Dose HTML5 or other JS library(jquery,proty.js etc.) work?
probably not, because gtk library doesn't provide DOM for visit, all html or js library based on DOM visit.but you can see seedkit project, it provide a way for write desktop app with web application way :PBTW, it's still UNSTABLE