If statement #4 above is passed, then:
This paragraph should be silver serif. All other properties are UA-default. The rule applied here is "P.foo {color: silver; font-family: serif;}", which has one class per selector.
This paragraph should be UA-default. The rule meant to be applied here is "P.foo1.foo2 {color: red; font-family: cursive;}", but there are two classes per selector. To move directly to the next test, click here