Guide To WordPress Web Hosting
Web Storage is a technique for Web applications to store data in a web browser. DOM Storage is standardized by the World Wide Web Consortium (W3C). Originally it was part of the HTML5 specification, but has now been spun off into a separate specification.
Currently, DOM Storage works with Internet Explorer 8, Mozilla based browsers (Firefox 2 +, officially since 3.5), Safari 4, Google Chrome 4, and Opera support 10:50. DOM Storage can be described as an evolution of cookies into super cookies. The technique provides much greater storage capacity (5MB per domain in Firefox, 10MB per storage area in Internet Explorer) and developing better interfaces. In some respects, however, it differs from cookies.
In contrast to cookies, both WordPress Web Hosting server and client can access the DOM Storage fully controlled by the client.
Data is not transmitted with every HTTP request to the server and a web server can not write data directly in the DOM Storage. Access is only via scripts on the page.