This test makes sure that storage of indexedDB does not grow unboundedly. 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; indexedDB.deleteDatabase(dbname) indexedDB.open(dbname) db = event.target.result store = db.createObjectStore('store') db = event.target.result store = db.transaction('store', 'readwrite').objectStore('store') request = store.add(new Uint8Array(204800), 'key') PASS 'error' in request is true PASS request.error.code is DOMException.QUOTA_EXCEEDED_ERR PASS request.error.name is "QuotaExceededError" PASS successfullyParsed is true TEST COMPLETE