| main frame - has 1 onunload handler(s) | |
| Tests that IntersectionObserver doesn't cause Document leaks. | |
| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". | |
| PASS internals.isDocumentAlive(frameDocumentID) is true | |
| PASS The iframe document didn't leak. | |
| PASS successfullyParsed is true | |
| TEST COMPLETE | |