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Exactly what are the capabilities required of a browser to run AJAX functionalities? As mentioned, a browser needs to provide two key capabilities: a proxy mechanism to make client code able to place out-of-band HTTP calls, and an updatable DOM.There's a W3C ratified standard for the updatable DOM. A W3C standard for the proxy component is currently being developed. It takes the form of the XMLHttpRequest object and is devised as an interface exposed by the browser to allow script code to perform HTTP client functionality, such as submitting form data or loading data from a remote Web site.