Providing state information to a server includes accessing a document object model (DOM) for a web application, the DOM corresponding to a tree structure which represents a first state of the web application. An indication of the first state of the web application is provided to a server based on the DOM. A determination is made that a predetermined event has occurred at the system, the predetermined event indicating that a second state of the web application, different than the first state of the web application, is to be provided to the server. In response to the determination, an indication of the second state of the web application, corresponding to an updated version of the DOM, is provided to the server.