Explore the adaptation of Thymeleaf for Spring 5's reactive web framework in this conference talk from Spring I/O 2017. Discover how Thymeleaf, a popular server-side template engine for Spring users, was refactored to meet the demands of the new reactive infrastructure. Learn about the challenges faced in adjusting to new APIs and implementing back-pressure support. Gain insights into Thymeleaf's evolution from traditional templating to becoming an on-the-fly HTML generator for reactive streams and data publishers. Begin with a brief introduction to Thymeleaf's features for newcomers, then delve into the integration challenges with Spring's reactive web framework and Thymeleaf's overall approach to the reactive paradigm.