OVERVIEW - CONTENT POSITIONING
Content Positioning allows you to precisely define where block elements are positioned on a web page. You can write Javascript code to modify these blocks, i.e. move them, hide them, and even make layers of them to achieve animation. You can even create self-modifying web pages.
Layers of a web page are like a stack of cards, one on top of another. These layers can transparent or obaque. To read more about layers, please CSS Layers.
There are two methods of content positioning: