we can provide cool animation effects in  page contents easily,  where when you scroll down. This provide an interesting and interactive experience for your viewers.

More about Scroll-based Animations ( http://mynameismatthieu.com/WOW/docs.html )

Scroll-based Animations egs:

http://mynameismatthieu.com/WOW/index.html
http://www.web2feel.com/freeby/scroll-effects/index6.html

Here you can find a sample HTML markup for the Scroll-based Animation.