The world wide web’s architecture has dramatically changed in the past few years. Browsers wars have been fought and won, and startups have been run into the ground.
With all this shifting and manipulating of technologies, there must be some importance placed on semantics. That is, seperating markup (XHTML) from design (CSS), and even seperating behavior from that (Javascript).
For instance, if you have a huge website, and you want to change the font throughout the whole site, you would only have to change one file if you had a global style sheet. This is a minute example, but you get the point.
Regardless of your HTML capability, this is an awesome book to browse:
