1 Verifies that requestStart and responseStart are available before the main document has finished loading.
3 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
6 PASS timing.requestStart is non-zero.
7 PASS timing.responseStart is non-zero.
8 PASS timing.responseEnd is 0
9 PASS successfullyParsed is true