1 Test that an appended script does NOT invoke MutationObserver callbacks
3 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
6 PASS mutationsDelivered is false
7 PASS scriptDidRun is false
8 PASS scriptDidRun is true
9 PASS mutationsDelivered is false
10 PASS successfullyParsed is true