| Checks that attributes are on the prototype are configurable. | |
| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". | |
| PASS event.eventPhase is 0 | |
| PASS event.__proto__.hasOwnProperty('eventPhase') is true | |
| PASS properties.configurable is true | |
| PASS properties.enumerable is true | |
| PASS delete event.__proto__.eventPhase is true | |
| PASS event.eventPhase is undefined | |
| PASS successfullyParsed is true | |
| TEST COMPLETE | |