Test IndexedDB cursor.update required arguments On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". dbname = "cursor-update-value-argument-required.html" indexedDB.deleteDatabase(dbname) indexedDB.open(dbname) db.createObjectStore('autoIncrement', { autoIncrement: true }); request = objectStore.openCursor(); keys = [1, -1, 0, 10, 2000, 'q', 'z', 'two', 'b', 'a']; keyIndex = 0; request = objectStore.add('foo', keys[i]); request = objectStore.add('foo', keys[i]); request = objectStore.add('foo', keys[i]); request = objectStore.add('foo', keys[i]); request = objectStore.add('foo', keys[i]); request = objectStore.add('foo', keys[i]); request = objectStore.add('foo', keys[i]); request = objectStore.add('foo', keys[i]); request = objectStore.add('foo', keys[i]); request = objectStore.add('foo', keys[i]); request = objectStore.openCursor(); cursor = event.target.result; PASS cursor.update(); threw exception TypeError: Failed to execute 'update' on 'IDBCursor': 1 argument required, but only 0 present.. PASS successfullyParsed is true TEST COMPLETE