Make sure that event targets get cleared after dispatching in a shadow tree.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS undefined is undefined.
PASS counter++ is 0
PASS window.event is undefined.
PASS counter++ is 1
PASS window.event is undefined.
PASS counter++ is 2
PASS counter is 3
PASS event.target is null
PASS event.relatedTarget is null
PASS successfullyParsed is true

TEST COMPLETE