Selenium 3.0 heralds a significant change as it has been shipped after a gap of 5 years. It is only a drop-in replacement for WebDriver API users; however, it has removed the major Selenium core implementation. The Selenium WebDriver API is fully object-oriented compared with the deprecated Selenium RC. The WebDriver API provides multi-language support and runs tests on all the most popular browsers. In this course, we focus on more advanced usage of the Selenium API to enable cross-browser testing, as well as simulating advanced user interactions with complex applications. Debugging rare test failures through advanced techniques and utilizing the specialized parts of each client library are covered as well.