1 Test that a live list is updated after the child of an HTMLOutputElement was removed.
3 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
6 The number of spans before removal is 2
7 The number of spans after removal is 1
8 PASS list.length == beforeLength - 1 is true
9 PASS successfullyParsed is true