[combatentropy]

Implementing WebSQL was so much work that all the browser vendors just basically bundled SQLite and called it a day. The problem was that the working group required at least one other implementation, before it became a standard. But that was such a monstrous project that none of the browser vendors wanted to take it on.

What the browser vendors agreed on is that they would rather have IndexedDB. I've never used it, but they say it is a lower-level API than SQL, and using it you could build your own SQL abstraction layer above it.

So we have as standards the key-value-based localStorage and then, halfway between that and SQL, is IndexedDB.

More: https://hacks.mozilla.org/2010/06/beyond-html5-database-apis...