Test IndexedDB deleteIndex method On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". indexedDB = self.indexedDB || self.webkitIndexedDB || self.mozIndexedDB || self.msIndexedDB || self.OIndexedDB; dbname = "deleteIndex.html" indexedDB.deleteDatabase(dbname) indexedDB.open(dbname) objectStore = db.createObjectStore('foo'); Expecting exception from objectStore.deleteIndex('first') PASS Exception was thrown. PASS code is DOMException.NOT_FOUND_ERR PASS ename is 'NotFoundError' PASS objectStore.deleteIndex() threw exception TypeError: Not enough arguments. index = objectStore.createIndex('first', 'first'); Expecting exception from objectStore.deleteIndex('FIRST') PASS Exception was thrown. PASS code is DOMException.NOT_FOUND_ERR PASS ename is 'NotFoundError' index = objectStore.createIndex('second', 'second'); returnValue = objectStore.deleteIndex('first'); PASS returnValue is undefined Expecting exception from db.createObjectStore('bar'); PASS Exception was thrown. PASS code is DOMException.INVALID_STATE_ERR PASS ename is 'InvalidStateError' Expecting exception from objectStore.deleteIndex('second') PASS Exception was thrown. PASS code is 0 PASS ename is 'TransactionInactiveError' PASS successfullyParsed is true TEST COMPLETE