1 layer at (0,0) size 800x600
2 RenderView at (0,0) size 800x600
3 layer at (0,0) size 800x51
4 RenderBlock {test} at (0,0) size 800x51 [bgcolor=#00FF00]
5 RenderBlock {p} at (0,16) size 800x19
6 RenderText {#text} at (0,0) size 314x19
7 text run at (0,0) width 314: "The background of the document should be green"