Verifies that mouse events are not fired on deleted nodes (crbug.com/515921) On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". outer received mouseover outer received mouseenter outer received mouseout inner received mouseover inner received mouseenter removed inner TODO(crbug.com/276329): We are missing a mouseout here! TODO(crbug.com/276329): We are missing a mouseleave here! outer received mouseover outer received mouseenter PASS successfullyParsed is true TEST COMPLETE