This is a testharness.js-based test.
[FAIL] getComputedStyle returns no style for element in non-rendered iframe (display: none)
  assert_true: expected true got false
[FAIL] getComputedStyle returns no style for element in non-rendered iframe (display: none) from iframe's window
  assert_true: expected true got false
[FAIL] getComputedStyle returns no style for element outside the flat tree
  assert_true: expected true got false
[FAIL] getComputedStyle returns no style for descendant outside the flat tree
  assert_true: expected true got false
Harness: the test ran to completion.