This document is a work in progress and is subject to change.
Summary
Use the background-position property to specify where a background image is placed. If the image repeats (horizontally, vertically or both) then it repeats from this location. If there is a single image, it is placed using the background-position property.
Syntax
background-position: [left | right] [N% | Npx] [N% | Npx] [top | bottom];