This is a testharness.js-based test.
[FAIL] HTMLMenuItemElement must not be not present
  assert_false: the HTMLMenuItemElement interface must not exist expected false got true
[FAIL] :enabled must not match menuitems
  assert_array_equals: lengths differ, expected array [] length 0, got object "[object NodeList]" length 3
[FAIL] :disabled must not match menuitems
  assert_array_equals: lengths differ, expected array [] length 0, got object "[object NodeList]" length 1
Harness: the test ran to completion.