This is a testharness.js-based test.
[FAIL] flexbox > item 3
assert_equals: \n<item data-offset-y="68" data-expected-margin-bottom="0"></item>\nmargin-bottom expected "0" but got "10"
[FAIL] flexbox > item 4
assert_equals: \n<item data-offset-y="68" data-expected-margin-bottom="0"></item>\nmargin-bottom expected "0" but got "10"
Harness: the test ran to completion.