Test closing a database connection in IndexedDB. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". dbname = "transaction-after-close.html" indexedDB.deleteDatabase(dbname) indexedDB.open(dbname) store = db.createObjectStore('store') request = store.put('x', 'y') PASS Put success running first transaction currentTransaction = db.transaction(['store'], 'readwrite') objectStore.put('a', 'b') db.close() Expecting exception from db.transaction(['store'], 'readwrite') PASS Exception was thrown. PASS code is DOMException.INVALID_STATE_ERR PASS ename is 'InvalidStateError' Exception message: Failed to execute 'transaction' on 'IDBDatabase': The database connection is closing. verify that we can reopen the db after calling close indexedDB.open(dbname) second_db = event.target.result currentTransaction = second_db.transaction(['store'], 'readwrite') request = store.put('1', '2') PASS final put success PASS successfullyParsed is true TEST COMPLETE