Hear me out guys - SQLite, but in a browser! We could call it WebSQL.

That's pretty much why it failed: https://www.w3.org/TR/webdatabase/

> This document was on the W3C Recommendation track but specification work has stopped. The specification reached an impasse: all interested implementors have used the same SQL backend (Sqlite), but we need multiple independent implementations to proceed along a standardisation path.