= What is accelerated compositing? =
 * Mapping certain elements on the page into bitmaps
 * Maintaining painting order
 * Moving/transforming those bitmaps
 * Mapping to hardware

= How is this different from hardware-accelerated drawing? =
 * It's based on bitmaps, not acceleration of all drawing commands (c.f. IE9's drawing)

= How is it implemented? =
 * Via GraphicsLayer
 * Relies in platform 3D/GPU framework