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