Also I think most of the rules might drop out with having in mind the scalability problem. If you do reduce CSS, HTML files to the very limit you might have a h

Also I think most of the rules might drop out with having in mind the scalability problem. If you do reduce CSS, HTML files to the very limit you might have a hard time later when you try to implement another feature. Same applies for JS which is getting more and more complex. Sure you can easily write a single page with vanilla script and even inline it to the HTML, but if you try to support IE it looks like you need to at least include either a library or a more complex JS code. So anyway all those tips are super overthought. The best ( hardest ) coding practice is taking a professional approach and decide where is the boundary between spaghetti code and performance benefit.