XMPP Chat Web Client for Browsers & Hybrid App

I need a very simple & ROBUST javascript Only web client for XMPP Ejabberd Server. Functionality - Start chat - Send & Receive Message - End chat - If internet goes down, store message in local store & keep polling. When internet is avaialble, send pending messages & display received messages. - After chat ends, delete all messages from [login to view URL] - Chat should continue uninterrupted when navigating from one web page to another. XMPP Functions: - Register account - No - Start chat - Send & Receive Message - Typing Indicator (Both ways) - Message Read Confirmation (Both ways) - End Chat Compatible: - Chrome, FF, IE, Safari on Laptop, Tablets, Windows, Linux, MAC - Integrate in Hybrid Apps (Cordova & other frameworks for future). IMP: (1) We want to use *maximum* native HTML5, CSS, Javascript code to ensure minimal conflict when integrating with hybrid app. (2) No additional features. Simple send/receive chats. PLS ASK QUESTION BEFORE BIDDING.