The document discusses how best practices in web development are not static and can change radically over time. It notes that terms like "best practice" may actually imply the worst approach. Different techniques for class names, CSS frameworks, object-oriented CSS, valid code, semantics, and priorities like mobile and print-first are mentioned as areas where practices have evolved. The overall message is that there is no single answer in web development and perspectives on what is best can differ depending on specific needs and circumstances.