This is a testharness.js-based test.
[FAIL] flexbox > item 1
assert_equals: \n<item data-expected-margin-top="0" data-expected-margin-bottom="10" data-offset-y="8"></item>\noffsetTop expected 8 but got 18
[FAIL] flexbox > item 2
assert_equals: \n<item data-expected-margin-top="0" data-expected-margin-bottom="10" data-offset-y="8"></item>\noffsetTop expected 8 but got 18
[FAIL] flexbox > item 3
assert_equals: \n<item data-expected-margin-top="10" data-expected-margin-bottom="0" data-offset-y="78"></item>\noffsetTop expected 78 but got 88
[FAIL] flexbox > item 4
assert_equals: \n<item data-expected-margin-top="10" data-expected-margin-bottom="0" data-offset-y="78"></item>\noffsetTop expected 78 but got 88
Harness: the test ran to completion.