| MutationRecord should be exposed on window but not constructable | |
| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". | |
| PASS window.MutationRecord is non-null. | |
| PASS typeof MutationRecord is "function" | |
| PASS new MutationRecord threw exception TypeError: Illegal constructor. | |
| PASS record instanceof MutationRecord is true | |
| PASS successfullyParsed is true | |
| TEST COMPLETE | |