Example

The following code opens a database asynchronously and make a request.  In your code, you have to access the attribute with vendor prefixes, that is to say, you should use mozIndexedDB for Firefox and webkitIndexedDB for Chrome.

// Taking care of the browser-specific prefixes.
if ('webkitIndexedDB' in window) {
   window.indexedDB = window.webkitIndexedDB;
   window.IDBTransaction = window.webkitIDBTransaction;
} else if ('mozIndexedDB' in window) {
   window.indexedDB = window.mozIndexedDB;
}

...

var db;
function openDB() {
 var request = indexedDB.open("creatures");
 request.onsuccess = function(e) {
   db = request.result;
 }
}