The new Thymeleaf Interactive Tutorial is a web application which runs on a local web server --e.g. a local Tomcat-- and proposes a series of exercises to enhance your thymeleaf skills. In order to solve these exercises, you will only need a text editor (and the web server, of course).
Both "extras" modules have been updated in order to conform to the changes in the newer version of the core.
Besides, thymeleaf-extras-springsecurity3 has been modified in order to allow the use of variables from the context in SpringSecurity expressions (e.g. "hasRole(...)"). See the project's page for more detail.