Web Storage and DOM Storage (Document Object Model) are web application software methods and protocols used for storing data in a web browser. Web storage supports persistent data storage, similar to cookies, as well as window-local storage. Web storage is being standardized by the World Wide Web Consortium (W3C). It was originally part of the HTML 5 specification, but is now in a separate specification. http://en.wikipedia.org/wiki/Web_Storage
see related Google Gears.
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