Test PerformanceObserver callback is a task, not a microtask.

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


PASS PerformanceObserver callback fired
PASS microtaskExecuted is false
PASS list.getEntries().length is 1
PASS Promise microtask fired
PASS PerformanceObserver callback fired
PASS list.getEntries().length is 2
PASS microtaskExecuted is true
PASS successfullyParsed is true

TEST COMPLETE