Saving data in HTML5

Question

Can someone tell me about DATA PERSISTENCE in

• HTML5 Web SQL Database
• Local storage
• Session Storage

Also tell us how they will be affected by clearing the cache.

Answer 1

Has all the necessary information: http://www.html5rocks.com/en/features/offline

Answer 2

• HTML5 Web SQL seems abandoned, so I will not document this.
• The local storage is stored "forever", that is, until the application or user explicitly clears the data.
• Saving a session is only saved until the end of the browser session (some browsers save data in a crash situation)

Clearing the cache should not affect the stored data, but clearing the cookies can destroy it.