It’s a straightforward tutorial on creating a simple application using webdatabase. here’s the intro:

Web Databases are new in HTML5. Web Databases are hosted and persisted inside a user’s browser. By allowing developers to create applications with rich query abilities it is envisioned that a new breed of web applications will emerge that have the ability to work online and off-line.

On November 18, 2010, the W3C announced that Web SQL database is a deprecated specification. This is a recommendation for web developers to no longer use the technology as effectively the spec will receive no new updates and browser vendors aren’t encouraged to support this technology. Many major browsers including Chrome, Safari, Opera and nearly all Webkit based mobile devices support WebSQL and will likely maintain support for the foreseeable future.

This tutorial is also available written using “IndexedDB”, the replacement offline storage technology.

This example code demonstrates how to create a very simple todo list manager. It is a very high level tour of some of the features available in HTML5.