This is a testharness.js-based test.
[FAIL] Property block-step-insert value 'margin-box'
  assert_true: block-step-insert doesn't seem to be supported in the computed style expected true got false
[FAIL] Property block-step-insert value 'padding-box'
  assert_true: block-step-insert doesn't seem to be supported in the computed style expected true got false
[FAIL] Property block-step-insert value 'content-box'
  assert_true: block-step-insert doesn't seem to be supported in the computed style expected true got false
Harness: the test ran to completion.