float 1, comments, AP box, float 2 (filling container), clear
float 2 has margin-right:-3px
float 2 doesn't fill the container (3px less)
clear has "layout"
float 2 has margin-right:-3px and clear has "layout"
comments and AP box in the source code are after the clear
AP box, float (filling container), clear
AP box, float (filling container) with margin-right:-3px, clear
AP box, float, clear with "layout"
float (filling container), clear with "layout", AP box