This test is a dump-render-tree test which makes sure that the following properties are appropriately applied:

The test passes if there is a particular sequence of checks and x characters below. Note that some x characters are expected.
A A B B A B A B A B A A A A A A A A A A A A A A A A A A A A A
A A B B A B A B A B A A A A A A A A A A A A A A A A A A A A A A
A A B B A B A B A B A A A A A A A A A A A A A A A A A A A A A
A A B B A B A B A B A A A A A A A A A A A A A A A A A A A A A A