Test IndexedDB key types 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 = "key-type-infinity.html" indexedDB.deleteDatabase(dbname) indexedDB.open(dbname) db.createObjectStore('foo'); test key as infinity request = objectStore.add([], Infinity); test key as negative infinity request = objectStore.add([], -Infinity); PASS successfullyParsed is true TEST COMPLETE