By now, we all know that we should be using HTML5 to build websites. One important part of HTML5 that is still not widely understood is sectioning content: section, article, aside and nav. Every Web page has an outline, and checking it is easy using a really simple free online tool.
Parallax scrolling (example) is a special technique where designers are using multiple layers to create an illusion of a 3 dimensional space. You will notice background images move slower than foreground image to add nice three dimensional depth illusions to the design.