A different way of making web apps (Score 2, Insightful)

It would not be better to use the browser to show only HTML, extend HTML document oriented tags with application oriented tags, SVG and use a protocol designed for applications not one for download documents? A protocol like X11 but with HTML, DOM nodes and DOM modifications. A stateful protocol without cookies, binary, designed for minimizing the amount of data traffic needed between server and client. The server sends HTML pages and DOM modifications to the client/browser at any moment and the cliente/browser shows the HTML, make the DOM modifications and sends function execution request to the server with user input. Just some ideas