Beginner's Guide to HTML5 & CSS3 - Part 5 of 12

I am an experienced developer, having spent my first 17 professional years in various Unix-like environments, following up with Windows since 1998. I have worked in web development teams since 2001, focused initially on Java but now fully settled into the .NET world. I have written production-value code in 8086 assembler, (various forms of) BASIC, Pascal, xnix shell (korn, mostly), C, C++, C#, and Java. When I code for fun at home, I usually play with Delphi, but I also keep an eye on Python because my friends keep telling me how cool it is.