Also I think IndexDB might turn out to be yet another compatibility headache because everybody will be creating their own implementation (I'm pretty sure there

Also I think IndexDB might turn out to be yet another compatibility headache because everybody will be creating their own implementation (I'm pretty sure there will be at least 3 - Microsoft, Mozilla & Webkit). It's a speculation but most likely this wouldn't be an issue with Web SQL DB because everybody would just use the same SQLLite backend. For a proposed web standard to become an actual web standard there need to be at least two implementations. This is a good, healthy thing. There was going to be no second implementation of Web SQL, so it was never going to become a standard.