There are the following storage types in browser side when do Javascript based web app.
- Cookie: there is # of cookies per domain limit, and size limit (around 4K limit)
- Memory: limit by system (?), data lost during browser refresh
- WebStorage: (sessionStorage, or localStorage) - http://diveintohtml5.info/storage.html
- AppCache: It is to store the whole web-app (pages, images, css, JavaScript) in the browser to make it available offline.
- Web SQL: relational database, SQLlite on browser, deprecated
- IndexedDB: NoSQL DB on browser side. IndexedDB which is already available on Chrome 12+ and Firefox 5+, and, soon, in IE 10 as well.
- GlobalStorage - deprecated
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