Gleb Bahmutov's blog post discusses the testing of the first built-in browser module, KV Storage, using Cypress, following its introduction in Chrome version 74+. KV Storage is designed to modernize data storage by abstracting IndexedDB and reducing reliance on localStorage. The blog outlines a series of Cypress tests to verify the functionality of a demo web application that utilizes KV Storage, emphasizing the need to enable experimental web platform features in Chrome and the challenges associated with testing such experimental features. The post also highlights the use of custom Cypress commands to simplify testing and the importance of setting and resetting IndexedDB values correctly across tests. Bahmutov concludes that the TC39 proposal for a JavaScript standard library could lead to more efficient web applications and more effective developer testing through automation support, which would enhance the overall user experience.