1 layer at (0,0) size 800x600
2 RenderView at (0,0) size 800x600
3 layer at (0,0) size 800x50
4 RenderBlock {test} at (0,0) size 800x50
5 RenderBlock {p} at (0,16) size 800x18
6 RenderText {#text} at (0,0) size 403x18
7 text run at (0,0) width 403: "The first line of this paragraph should have a green background."