Test IndexedDB: transaction storeNames required arguments On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". dbname = "transaction-storeNames-required.html" indexedDB.deleteDatabase(dbname) indexedDB.open(dbname) PASS db.transaction(); threw exception TypeError: Failed to execute 'transaction' on 'IDBDatabase': 1 argument required, but only 0 present.. PASS successfullyParsed is true TEST COMPLETE