[register-property.html]
  [registerProperty requires a name matching <custom-property-name>]
    expected: FAIL

  [registerProperty fails for an already registered property]
    expected: FAIL

  [registerProperty only allows omitting initialValue if syntax is '*']
    expected: FAIL

  [registerProperty requires inherits]
    expected: FAIL

  [Registering a property should not cause a transition]
    expected: FAIL