| Tests one requestAnimationFrame callback cancelling a second | |
| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". | |
| PASS successfullyParsed is true | |
| TEST COMPLETE | |
| PASS callbackFired is false | |
| PASS cancelFired is true | |
| PASS successfullyParsed is true | |
| TEST COMPLETE | |