It’s not a great phone app without ASP.NET services and push notifications

Does the HTML5 with RIA Services supports CRUD(Create, Update, Delete) opperations in Offline mode?
How works the synchronization? What happens if somebody deleted the record and you want to sync it with an update?
I am not able to build the codes successfully. I am not java script guys too.
Is the works on pub sub mechanism. Will HTML client get notification if it subscribes to WCF service which is getting data from Cloud Service bus???
Need help and suggestions on this please.