1 Tests that there is an upper limit on the number of hit rects generated per layer. http://crbug.com/299177.
3 Test node has 99 children with 100 rects
4 Test node has 100 children with 1 rects
5 Test node has 101 children with 1 rects
6 manychildren: DIV#layer (0, 0, 308, 1228)