A step-by-step tutorial on how to create a beautifully looking Christmassy scrolling effect by Paulina Hetman from Pepsized.skrollr is much more than “just” parallax scrolling. It’s a full-fledged scrolling animation library. In fact, you can use it and still have no parallax scrolling at all. But I wanted to sound hip and use some buzz-words. By the way, skrollr leverages HTML5 and CSS3.skrollr allows you to animate any CSS property of any element depending on the horizontal scrollbar position. All you need to do is define key frames for each element at certain points in top scroll offset.
Animation Core Java Script CSS HTML5