This is a testharness.js-based test.
[FAIL] item 2
assert_equals: \n<item data-expected-margin-bottom="0" style="block-size: auto;">\n <div><item data-expected-margin-bottom="10"></item></div>\n <div>\n <item data-expected-margin-bottom="0" style="block-size: auto;">\n <div><item data-expected-margin-bottom="0"></item></div>\n </item>\n <item class="collapsed" data-expected-margin-bottom="0">\n <div><item class="collapsed" data-expected-margin-bottom="0"></item></div>\n </item>\n </div>\n <item class="collapsed" data-expected-margin-bottom="0">\n <div><item class="collapsed" data-expected-margin-bottom="0"></item></div>\n </item>\n </item>\nmargin-bottom expected "0" but got "10"
[FAIL] item 4
assert_equals: \n<item data-expected-margin-bottom="0" style="block-size: auto;">\n <div><item data-expected-margin-bottom="0"></item></div>\n </item>\nmargin-bottom expected "0" but got "10"
[FAIL] item 5
assert_equals: \n<item data-expected-margin-bottom="0"></item>\nmargin-bottom expected "0" but got "10"
[FAIL] item 6
assert_equals: \n<item class="collapsed" data-expected-margin-bottom="0">\n <div><item class="collapsed" data-expected-margin-bottom="0"></item></div>\n </item>\nmargin-bottom expected "0" but got "10"
[FAIL] item 7
assert_equals: \n<item class="collapsed" data-expected-margin-bottom="0"></item>\nmargin-bottom expected "0" but got "10"
[FAIL] item 8
assert_equals: \n<item class="collapsed" data-expected-margin-bottom="0">\n <div><item class="collapsed" data-expected-margin-bottom="0"></item></div>\n </item>\nmargin-bottom expected "0" but got "10"
[FAIL] item 9
assert_equals: \n<item class="collapsed" data-expected-margin-bottom="0"></item>\nmargin-bottom expected "0" but got "10"
[FAIL] item 10
assert_equals: \n<item class="collapsed" data-expected-margin-bottom="0">\n <div><item class="collapsed" data-expected-margin-bottom="0"></item></div>\n </item>\nmargin-bottom expected "0" but got "10"
[FAIL] item 11
assert_equals: \n<item class="collapsed" data-expected-margin-bottom="0"></item>\nmargin-bottom expected "0" but got "10"
Harness: the test ran to completion.