Anton Angelov will explain in many details and code examples how to automate hard-to-test web app functionalities using Selenium 4 BiDirectional and Chrome DevTools APIs. We will discuss test automation of progressive web applications, web sockets, memory leak checks. In addition, you will learn how to perform internationalization, localization, and network performance testing. Finally, we will investigate how you can use the protocols to speed up your tests using the black hole proxy pattern.