There's a spec in development to make an origin's storage persistent https://storage.spec.whatwg.org/#dom-storagemanager-requestpersistent https://storage.spec.

There's a spec in development to make an origin's storage persistent https://storage.spec.whatwg.org/#dom-storagemanager-requestpersistent https://storage.spec.whatwg.org/#dom-storagemanager-requestp... - at the moment Chrome only drops data from indexeddb and the cache api if the device starts running out of space.