This is a testharness.js-based test.
[FAIL] Property mask-border-mode has initial value alpha
  assert_true: mask-border-mode doesn't seem to be supported in the computed style expected true got false
[FAIL] Property mask-border-mode does not inherit
  assert_true: expected true got false
[FAIL] Property mask-border-outset has initial value 0
  assert_true: mask-border-outset doesn't seem to be supported in the computed style expected true got false
[FAIL] Property mask-border-outset does not inherit
  assert_true: expected true got false
[FAIL] Property mask-border-repeat has initial value stretch
  assert_true: mask-border-repeat doesn't seem to be supported in the computed style expected true got false
[FAIL] Property mask-border-repeat does not inherit
  assert_true: expected true got false
[FAIL] Property mask-border-slice has initial value 0
  assert_true: mask-border-slice doesn't seem to be supported in the computed style expected true got false
[FAIL] Property mask-border-slice does not inherit
  assert_true: expected true got false
[FAIL] Property mask-border-source has initial value none
  assert_true: mask-border-source doesn't seem to be supported in the computed style expected true got false
[FAIL] Property mask-border-source does not inherit
  assert_true: expected true got false
[FAIL] Property mask-border-width has initial value auto
  assert_true: mask-border-width doesn't seem to be supported in the computed style expected true got false
[FAIL] Property mask-border-width does not inherit
  assert_true: expected true got false
Harness: the test ran to completion.