Test IndexedDB's behavior adding inline and passed key simultaneously On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". dbname = "key-requirements-inline-and-passed.html" indexedDB.deleteDatabase(dbname) indexedDB.open(dbname) objectStore = db.createObjectStore('baz', { keyPath: 'id' }); Expecting exception from objectStore.add({id: 5}, 5); PASS Exception was thrown. PASS code is 0 PASS ename is 'DataError' Exception message: Failed to execute 'add' on 'IDBObjectStore': The object store uses in-line keys and the key parameter was provided. PASS successfullyParsed is true TEST COMPLETE