This is a testharness.js-based test.
Found 10 FAIL, 0 TIMEOUT, 0 NOTRUN.
[FAIL] PerformanceLongTaskTiming interface: attribute startTime
assert_own_property: expected property "startTime" missing
[FAIL] PerformanceLongTaskTiming interface: attribute duration
assert_own_property: expected property "duration" missing
[FAIL] PerformanceLongTaskTiming interface: attribute name
assert_own_property: expected property "name" missing
[FAIL] PerformanceLongTaskTiming interface: attribute entryType
assert_own_property: expected property "entryType" missing
[FAIL] PerformanceLongTaskTiming interface: default toJSON operation on [object PerformanceLongTaskTiming]
assert_true: property "id" should be present in the output of PerformanceLongTaskTiming.prototype.toJSON() expected true got false
[FAIL] TaskAttributionTiming interface: attribute startTime
assert_own_property: expected property "startTime" missing
[FAIL] TaskAttributionTiming interface: attribute duration
assert_own_property: expected property "duration" missing
[FAIL] TaskAttributionTiming interface: attribute name
assert_own_property: expected property "name" missing
[FAIL] TaskAttributionTiming interface: attribute entryType
assert_own_property: expected property "entryType" missing
[FAIL] TaskAttributionTiming interface: default toJSON operation on [object TaskAttributionTiming]
assert_true: property "id" should be present in the output of TaskAttributionTiming.prototype.toJSON() expected true got false
Harness: the test ran to completion.