1. Respond.js is not in the footer, it is inside the <head> tag. See here: https://github.com/thatcoolguy/gridless-boilerplate/blob/mas... 2. HTML5's syntax is not very strict, but I prefer closing void elements because I think it improves readability. 3. I chose not to add any responsive image style by default because of IE problems and Windows' rendering. I'm thinking of adding that soon.