But IndexedDB has been struggling very hard from day 1 to be as fast and performant as WebSQL. You can do the benchmark yourself [1]. Try inserting 10000 records. WebSQL is by orders of magnitude faster than IndexedDB.

The people who rejected WebSQL proposal had a lack of decisiveness and technically-focused vision. They also interpreted everything very politically.

[1] http://scaljeri.github.io/indexeddb-vs-websql/v2.0.0/