How to build web sites that work well across various browsers versions and devices is always challenging for web developers. In this episode, you will learn tools available for interoperability tests, and how to use them. I will demonstrate how easy you will be able to leverage the tools, to identify the problems, and to analyze the interoperability issue in your website. Browser detection, feature detection, CSS prefix, and fallbacks will all be discussed in the future episodes. With a couple of simple changes to your sites, you can take advantage of web standards and HTML5 features today without breaking your sites in the future.