13 Overview  section in Graphics Overview
43 (Retained) Layers
56 Compositing
84 Render and retain layer elements
96 Creating the layer tree
108 Refresh Driver
111 Layers
114 Rendering each layer
117 Tiling vs. Buffer Rotation vs. Full paint
120 Compositing for the final result
123 Graphics API
126 Moz2D
136 Compositing
139 Image Decoding
142 Image Animation