Web SQL Database

Web SQL Database is a web page API for storing data in databases that can be queried using a variant of SQL.

The API is supported by Google Chrome,Opera,Safari and the Android Browser.

The W3C Web Applications Working Group ceased working on the specification in November 2010, citing a lack of independent implementations (i.e. the use of a database system other than SQLite as the backend) as the reason the specification could not move forward to become a W3C Recommendation.

Mozilla Corporation were one of the major voices behind the break-up of negotiations and deprecation of the standard, while at the same being the main proponents behind an 'alternative storage' standard, IndexedDB.

...
Wikipedia