Indexed DB is a database platform that is built-in to HTML5, and it’s meant to work on all browsers as a replacement for WebSQL. Frankly, it’s not quite there yet; I had issues trying to learn Indexed DB using in-browser tools. However, it runs incredibly well in a Windows 8 app. I was able to completely switch my app’s functionality over to Indexed DB in less than a day, and I saw a marked improvement in the speed of my data handling. Although Indexed DB isn’t directly tied to HTML5, it is part of the overall push for better standards in web development that goes hand-in-hand with HTML5, and it’s hard to find it referenced without a mention of HTML5.