[ad_1] https://i.ytimg.com/vi/IBFb74Yv8wA/hqdefault.jpg On day 3 Jen Kramer of O’Reilly Media, Inc. examines Bootstrap 4’s new features and functions. She looks at the Sass files. That’s right – Bootstrap 4 has dumped LESS in favor of Sass CSS preprocessor files. The files have been completely rewritten and refactored to take advantage of Sass data structures. It’s…