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
outer received mouseleave
outer received mouseover
outer received mouseenter
PASS successfullyParsed is true
TEST COMPLETE