HTML5's Local Storage and the Web Storage Specification
HTML5 Storage (web storage) is actually the storing of a key/value pair on the web client (browser). Web storage has several advantages over more traditional cookies, and works on most of the current web browsers, including Chrome 8, Safari 5, Internet Explorer 8, and Firefox 3.6.
Web storage is a feature of modern browsers that enables an experience that is closer to a standard desktop application than what we expect from a standard web browser. The Web Storage API is simple to use, and consistent across most current web browsers.