Sorry if this is not a question I should ask here, but:
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migrated from stackoverflow.com Jan 30 '13 at 22:15
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It loads additional content as you scroll down and co-ordinates the animation. They aren't using CSS transitions, although some of the effects can be achieved with CSS too - but when you are loading the content and triggering animations all inside of jQuery, you might as well animate there too to keep it all in once place.
The animation is trigged by the scrollTop value.
I would program this that way (JQuery of course :o) :