[Tur]b(o)log(y)

Started reading a book on CSS named CSS Mastery by Andy Bugg. He says this on the DOCTYPE tag that would start a html document (p.10):

[...] Despite writing valid CSS, if you choose the wrong DOCTYPE, your pages will be rendered in quirks and behave in a buggy and unpredictable way. As such, it is important to include a fully formed DOCTYPE declaration on every page of your site and choose a strict DTD when using HTML.[...]

Been a while since I read about CSS, so I see, the world has moved on, and it's high time to do some refreshing ...